BRUES: PHORIDAE OF GREXADA. 



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the coxa and four less enlarged above near the spiracle; a bristle 

 directly above spiracle. Mesopleura entirely bare. Abdomen with 

 a taft of bristles at sides of second segment and a row of minute ones 

 along the posterior margin of each segment. Legs large, but not 



Fig. 2. — Bix;kerina ncotropica Brues. a, wing: b, front showing chaelotaxy. 



especially stout, all tibiae without bristles or setulae before apex; 

 hind tibiae but not middle ones with a small patch of transverse comb- 

 like rows of bristles inside at apex; tarsi slender. Wings small, 

 broad basally, but much narrowed beyond middle; costa extending 

 to slightly beyond middle of wing, the third vein widely separated 

 from the costa; costal cilia rather short, closely placed; first section 

 of costa scarcely longer than the second and third together, second 

 twice as long as third, fork not very acute, the cell thus formed rather 

 large, fourth vein evenly bent, not recurved at tip; fifth vein nearly 

 straight; sixth faintly bisinuate; seventh nearly straight. 



This peculiar species is probably referable to Beckerina although 

 the bristhng of the front is complete, with four bristles in the lower 

 row, not two as occur in B. orphnephiloidcs Malloch. I have not 

 seen the other member of the genus, B. umhrimarcjo Becker of Europe, 

 but as nearly as I can gather from Becker's description the frontal 

 chaetotaxy of that species is similar to the present one from Grenada. 

 The tibiae are without bristles as in Aphiochaeta and do not even show 

 the small setulae usually present on the hind pair in that genus. 



