1 8 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. 

 Biuncinnate: 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 vittre. 

 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 Mountain 



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 liguln 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; ist (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. 



