erse line extending half way
across the primaries very close to base.

Basal lobe: of culicid genitalia, see claspette.

Basal post-costal vein: in Agrioninae, one of the cubito-anal
cross-veins.

Basal segment of clasp: see side piece.

Basal space: that area on the primaries of certain Lepidoptera,
between the base and t. a. line (q.v.).

Basal streak: in Noctuid moths, extends from base, through the
submedian interspace to the t. a. line.

Basal transverse carina: on the metanotum of Hymenoptera, crosses
before middle and separates the anterior from the median areas.

Base: that part of any appendage that is nearest the body: on the
thorax that portion nearest the abdomen; on the abdomen that
portion nearest the thorax.

Basement membrane: that thin layer of tissue upon which the
epithelium rests.

Basilar: of or pertaining to the base.

Basilar cross-vein: Odonata; crosses the basilar space.

Basilar membrane: a thin membrane separating the cones and rods
from the optic tract.

Basilar space: Odonata; that area at base of wings, between media
and cubitus.

Basi-proboscis: basal third of the flexed proboscis of muscid flies.

Batesian mimicry: see mimicry.

Bathmis: see pterostigma.

Bave: the fluid silk as it is spun by caterpillars.

Beak: any notable prolongation of the front of the head: the snout in
Rhynchophora: specifically, the jointed structure covering the lancets
in the hemipterous mouth.

Bearded: fringed with hair: see barbated.

Belly: venter; under side of abdomen.

Belonoid: needle-like.

Bi: prefix, means two.

Bi-alar: two-winged; applied to Diptera.

Biarcuate: twice curved.

Biareolate: with two cells or areoles: see bilocular.

Bicaudate: having two tails or anal processes.

Bicolored: with two colors that contrast to some extent.

Bicornute: with two horns or cephalic processes.

Bicuspidate: ending in two points or cusps.

Bidactylate: with two fingers or finger-like processes.

Bidentate: two-toothed.

Biemarginate: twice emarginate; with two excisions.

Bifarious: pointing in opposite directions.

Bifasciate: with two bands or fascia.

Bifid: divided into two parts; split; applied in Coleoptera to tarsal
claws which are divided so that the claws lie side by side: see
biparted.

Biflabellate: antennae with fan-like process on two sides.

Bifurcate: divided, not over half its length, into two dull points; forked.

Bifurcation: a forking or divi