TWENTY-FIFTH ANNUAL MEETING. 



113 



On examination, Dr. S. W. Williston finds this Bihio to be undescribed, and has 

 kindly furnished the following description, proposing to name the species tristis. 



BiBIO TBI8TI8 (n. 6.) 



Female. — Black, shining, legs red; spines of front tibiae very unequal in size; 

 ■wings dilutely subfuscous, the costal margin brownish; pile black. Length 00 mm. 



Male. — Legs darker, mostly blackish. 



Female. — Black, shining, the venter and the coxae, save the front pair in part, of 

 the same color. Pile black, somewhat whitish on the abdomen. Legs red or yel- 



BiBio TEisTis. — a, larva: 6, venter, posterior segment of la,rva; c, ventral aspect of head of larva, 

 showing mouth parts; 4, dorsum, posterior segment of larva; e, adult. 



