Scudder.] 258 [March 22, 



Tegmina slightly longer than broad, the hinder edge cut obliquely in 

 a gentle curve, so that when at rest the combined hinder edges form a 

 slight concave curve. Wings wanting. Legs luteous, the apical half of 

 the fore and middle femora and the apical third of the hind femora 

 black, or blackish fuscous. Abdomen very distantly and very 

 minutely punctulate, each pit giving rise to a minute short hair. 

 Forceps long and very slender, those of the female nearly as long as 

 the abdomen, attingent, subquadrate, straight until close to the tip 

 and then curved slightly inward, unarmed, vinous red, slightly ob- 

 scured at the tip; those of the male nearly twice as long as the abdo- 

 men, the basal half subquadrate, very slightly bowed in opposite 

 directions, the inner edges delicately toothed or granulate, with a 

 slight but distinct tooth in the middle, beyond which the arms of the 

 forceps are subcylindrical, subattingent, and have the curve of the 

 female; the basal half is mostly vinous red, more or less obscured, 

 especially toward the tip, the apical half blackish. Length of body 

 excluding forceps, 12-13 mm.; of antennae, 8.5 mm.; of tegmina, 

 2.5 mm.; of hind femora, 3.5 mm.; of forceps, cT, 10.5 mm., ?, 5.25 

 mm. Described from 4 d, 3 ?, taken by Sumichrast (No. 6) in the 

 mountains about Orizaba, Mexico, under bark in the month of Jan- 

 uary. Smithsonian Institution. 



In describing this genus I stated that the terminal segment of the 

 abdomen was alike in both sexes; this is not strictly true, that of the 

 female narrowing much more rapidly than that of the male. I also 

 compared it with the old world Lobophora, but failed at the time, for 

 want of proper material, to see its much closer affinity to Nannopygia. 



52. Thermastris Chontalia. Head black, the mouth parts 

 luteo-fuscous, obscured with blackish. Antennas with more than thirty- 

 four joints, the first and third joints stouter and shorter than in T. 

 brasiliensis, the first twelve and thirteen joints blackish fuscous, be- 

 yond growing paler fuscous. Prothorax and tegmina blackish brown, 

 with very distant, short, stout, tapering hairs; pronotum nearly flat, 

 with a very obscure median longitudinal depression; tegmina sinu- 

 ously and obliquely docked at tip, twice as long as the prothorax; the 

 projecting portion of the wings, as in the other species of the genus, 

 is covered with hairs like those on the tegmina, and squarely docked 

 at extreme tip, but unlike the other species is of the same color as 

 the tegmina, with very slightly paler inner edge. Legs dirty yellowish 

 brown, the femora covered sparsely with spinous hairs, the tibiae and 

 tarsi blackish above. Abdomen dull castaneous, rugulose, the last 



