18 EXPLANATION OF TERMS 



Biserrate: doubly saw-toothed; with a saw tooth on each side of each an- 

 tennal joint. 



Bisetose -ous: with two bristle-like or setaceous appendages. 



Bisinuate: a margin or line with two sinuations or incisions. 



Bituberculate: with two distinct tubercles. 



Biuncinate: with two hooks. 



Bivalve -ed: applied to mouth parts consisting of two parts or valves united 

 to form a tube. 



Bivittate: with two longitudinal stripes or vittae. 



Blade: of maxilla, see lacinia. 



Blastem: a nucleated protoplasmic layer preceding the blastoderm. 



Blastoderm: the germinal membrane from which the organs of the embryo 

 are formed. 



Blastodermic cells: are those forming the blastoderm. 



Blastogenic: relating to or inherent in the germ or blast. 



Blastophore: the primitive mouth of the embryo. 



Blind : without eyes : applied also to an ocellate spot without a pupil. 



Bloom: a fine violet dusting similar to that on plums. 



Blotch: a large irregular spot or mark: large whitish membrane between ab- 

 domen and thorax in certain saw-flies. 



Blunt: not sharp; obtuse at the edge or tip. 



Body: the trunk: usually applied to the thorax only; rarely to the abdomen 

 alone ; sometimes to thorax and abdomen combined. 



Bombifrons: front of head with a blister-like protuberance. 



Bombous: blister-like; spherically enlarged or dilated. 



Bombycinous: a very pale yellow like fresh spun silk. 



Boreal: from or belonging to the north: is that faunal region that extends 

 from the polar sea southward to near the northern boundary of the United 

 States and farther south occupies a narrow strip along the Pacific Coast 

 and the higher parts of the Sierra-Cascade, Rocky and Alleghany Moun- 

 tain ranges ; divided into Arctic, Hudsonian and Canadian : see austral and 

 tropical. 



Borer: applied to an insect or larva that burrows or makes channels in 

 woody or other vegetable tissue. 



Botryoidal: clustered like a bunch of grapes. 



Bouclier: the pronotum, q. v. 



Bouton: a button; the terminal lappet-like process at the tip of the ligula 

 in bees : = spoon. 



Brachelytra: with abbreviated wing covers or elytra. 



Brachia: the arms: has been applied to raptorial fore-legs. 



Brachial: relating to an arm; arm-like. 



Brachial cells: Hymenoptera; 1st (Nort.), = costal and sub-costal (Comst.) ; 

 2d (Nort.), = medial (Comst.); 3d (Nort.), = cubital (Comst.); 4th 

 (Nort), ~2d anal (Comst.). 



Brachial veins: of primaries in Hymenoptera, originate at base, run parallel 

 to inner edge toward anal angle ; often connected with the cubital cellules 

 by means of recurrent venules. 



