B

Badius. - Bay-coloured; like a bay horse in colour. (L. badius.)

Balancers. - The poisers or halteres (Owen). (M.E.)

Bald. - A portion of the surface devoid of hair when the rest is hairy. (C.) M.E. balled; the original sense was “shining, white”; E. ball, a white-faced horse - Gael, and Irish, bal, ball, a white spot or streak.

Barbate. - When an opening (as the mouth) is surrounded by long hairs. (L. barba, a beard.)

Barbate. - (Antennæ) Bearded, covered with short and thick-set hair completely upon one side. (L. barba.)

Base. - (Wing.) The narrow attachment of the wing to the thoracic segment. (F. - L. - Gr.) M.E. bas. - F. base. - L. basis. - Gr. base, a pedestal, base, step.

Base. - That portion whereby it is affixed to the body; the root or bottom upon which an organ stands.

Basiconic sensillæ. - Upright conical club-like sense-hairs which are immovable at the base, while the chitinous investment is very thin. (Berlese.) (L. basis, conicus, and from sensus, the sense.)

Basilaire. - Straus' term for the Jugulum. (L. basilaris, from basis.)

Basilar membrane. - A thin fenestrate membrane separating the cones and rods from the optic tract. (From Base, and L. membrana.)

Basis. - The base, the whole lower part of the theca, from the mouth to as far as the labella. (L.)

“Battledore Scales.” - A term given to one of the numerous varieties of spinules. (M.E. batyldoure, Provincial batedor. [The corruption to battledore was due to confusion with battle, verb to light] and M.E. scale.)

Belly. - (A.S. bælg, bælig, a bulge, a belly.) See Venter.

Bi-. - Latin prefix, signifying two, or twofold.

Biarticulate. - Having two joints. (L. bi, and artus, a joint.)

Bicarinate. - Having two longitudinal elevated lines. (L. bi, and carina, a keel.)

Bicaudate. - Possessing two tails or processes. The term is generally applied to the wings of Lepidoptera when so formed. (L. bi, and cauda, a tail.)

Bicornute. - Two horned. (L. bi, and cornu, a horn.)

Bicuspidate. - Ending in two points. (L. bi, and cuspis, a point.)

Bifarious. - Pointing in two ways, in opposite directions. (L.)

Bifasciate. - Furnished with two coloured bands. (L. bi, and fascia, a band.)

Bifida. - (Lingula). Having a deep notch down the centre. (L. bifidus, cleft into two parts.)

Biflabellate. - (Antennæ). Doubly flabellate, i.e. when both sides of the joints of the antennæ send forth flabellate processes. (L. bi, and flabellum, a fan.)

Bifurcate. - (Antennæ). Composed of two joints, of which the apical one is bent double and attached by its centre to the second joint. (L. bi, and furca, a fork.)

Bifurcate, Bifurcated, Bifurcous. - Two jointed; forked, into two joints. (L. bi, and furca.)

Bijugum. - In two pairs. (L. bi, and jugum, a yoke.)

Bilamellar. - Divided into two laminæ. (L. bi, and lamina, a plate.)

Bilineate. - Marked with two lines. (L. bi, and linea, a line.)

Bilobed. - With two lobes; two-lobed. (L. bi, and Gr. lobos, a lobe of the ear.)

Binate. - Consisting of a single pair. (From L. binus, twofold; L. bi, double.)

Bipartite. - Divided into two parts to the base, as a leaf (see Partite). (L. bi, and partite, with proper division.)

Bipectinate (duplicato-pectinatæ). - Doubly pectinate. (L. bi, and pecten, a comb.)

Bipupillate. - When the ocellus has two pupils or spots of colour; possessing two pupils of different colour. (L. bi, and pupilla, a pupil.)

Biradiate. - Consisting of two rays. (L. bi, and radius, a ray.)

Biserrate. - Doubly serrate. (L. bi, and serra, a saw.)

Bisetous. - Furnished with two setaceous appendages. (L. bi, and seta, a bristle.)

Bivalve. - (Proboscis.) Consisting of two valves or divisions united, so forming a tube. (L. bi, and valva, a valve.)

Blade. - (Lacinia.) The extreme portion of the maxillæ. (A.S. blade, a leaf.)

Blastoderm. - The germ-skin; the germinal membrane which lies immediately beneath the membrana vitelli of the ovum. (Gr. blastos, a germ, and derma, skin.)

Blastodermic cells. - The cells forming the blastoderm. (L, blastos, derma; and cella, from celo, to hide.)

Blastula. - The stage of development of the egg; a hollow bag with a cellular envelope formed by the nuclei moving towards the margin of the egg, where they arrange themselves in a layer surrounding the yoke, their masses of protoplasm become marked oil into distinct cells and a cell layer, and the blastoderm is thus formed internal to the yoke membrane. (Gr. blastos, a germ.)

Blind ocellus. - An eye of colour without any pupil. (A.S. blind, + Du. blind, to become dim, and ocellus.)

Blood-gills. - Delicate anal tubular processes into which the blood flows, and which do not as a rule contain tracheæ, though occasionally very fine tracheal branches are to be seen in trichopterous larvæ. (Muller.) (A.S. blod, + Du. bloed; and M.E. gille.)

Boreal. - Of, or belonging to the north. (Step.) (From Gr. and L. boreas, the north wind.)

Botryoidal. - Clustered like a bunch of grapes. (Gr. botrys, a bunch of grapes, and eidos, like.)

Bound. - (Pupæ.) (F. borne, to restrain, limit.) See Pupæ contignæ.

Bouton. - The ladle-like organ situated at the apex of the lingua in the higher Aphidæ. (F. button.)

Brachelytrous. - Possessing short elytra. (Gr. brachys, short, and elytron, a wing case.)

Brachial nervures. - The nerves of the anterior or front wing, which originate at the thorax and run parallel with the interior edge, towards the posterior angle (or edge). (F. brachial - L. brachialis, of, or belonging to the arm; brachium, the arm.)

Brain. - The supraœsophageal ganglion. (A.S. brægen.) Encephalum.

Breast. - The part of the thorax analogous to the breast of vertebrates. (M.E. brest, breest. A.S. breost. + Icel. brjost.) See Pectus.

Branche transversale. - See Pars basalis. [PM]

Brevate, Breves. - (Antennæ.) The term is used when the antennæ are about the length of the head. (L. brevis, short.)

Breviorate, Breviores. - (Antennæ.) The term is used when the antennæ are longer than the head, and shorter than the body. (L. brevior, short.)

Brevissimate, Brevissimæ. - (Antennæ.) The term is used when the antennæ are shorter than the head. (L. brevissimus, short.)

Broken. - (A.S. brucan ?). See Fractæ.

Bronze. - The colour of old brass. (F. bronze. - Ital. bronzo; bronzino, made of brass (z = ds). - L. æs Brundusinum. - L. Brundusium, Brindisi (in Italy) where bronze mirrors were made.)

Bronzus. - Bronze-coloured. (F. - Ital. - L. see Bronze.)

Brosse. - Brush; the brush often found upon the mola, formed of short, stiff hairs. (Fr. brosse, a brush.)

Brunneus. - Brown; chestnut-coloured. Evidently a bastard compound. (Low L. brown.)

Brush. - [See Brosse.]

Brushes. - The bunches of stout hairs situated one on each side of the anterior end of the head of the Culicidæ larvæ. (From F. brosse, a brush.)

Brushes. - The tufts of more or less dense hair, seen in the larvæ of Culicidæ, situated either round the fin-like processes of the abdominal segments, or round the respiratory siphon. (F. brosse.)

Buccal. - Pertaining to the mouth. (L. bucca, the cheek.)

Buccal cavity. - The cavity of the mouth.

Buccate. - A head furnished with swollen cheeks. Caput buccatum. (L. bucca.)

Budding. - The term often used to the peculiar agamic reproduction of Aphids. (M.E. budden, to bud.)

Bulbus. - The bulb; the base of the scape, by which it inosculates in the torulus, often subglobose, and looking like a distinct joint. (L.)

Bullate. - Blistered. (L. bulla, a bubble.)

Bursa copulatrix. - An evagination of the vagina, into which the penis of the male is inserted in copulation. (In the Lepidoptera the bursa copulatrix is peculiar, in that it is not a simple evagination of the vagina, but a tube, open at both ends, one end leading into the vagina, the other into the surface of the body; so that here the female genital organs have two pores, that into the bursa serving for copulation, whilst the vaginal opening proper allows only of the escape of the eggs.) (L. bursa, a purse, and from copulare, to join.)