l6 EXPLANATION OF TERMS 



Bar: a short, straight band of equal width. 



Barb: a spine armed with teeth pointing backward. 



Barbate: furnished with barbs; hair with spines or spurs directed backward. 



Barbated: bearded; in antennae with tufts or fascicles of hair or short bristles 



on each side of each joint ; = brush-like : on the abdomen, with flat tufts at 



the sides or tip. 

 Barbule: a small barb, beard or filiform appendage. 

 Bare: without clothing of any kind: see bald. 

 Basad: in the direction of or toward the base. 

 Basal: at or pertaining to the base or point of attachment to or nearest the 



main body. 

 Basal area: in wings; that space nearest the point where they are attached 



to the body: on the metanotum of Hymenoptcra, the anterior of the three 



median cells or areas ; = ist median area. 

 Basal cell: Diptera; ist (Will.), = radial 2 (Comst.) ; 26. (Will.), = media 



(Comst.) ; Trichoptera ; one, two or three cells enclosed by the branches that 



form the post-costal or anal vein: Odonata; an elongate cell between radius 



and cubitus, just before the arculus. 

 Basalis: the principal mandibular sclerite, when sclerites are distinguishable, 



to which all other parts are jointed; corresponds to the stipes in the maxilla. 

 Basal line: in many Lepidoptera; a transverse line extending half way across 



the primaries very close to base. 

 Basal lobe: of culicid genitalia, see ciaspette. 



Basal post-costal vein: in Agrionincc, 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 Hymenoptcra, 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. 



