13 



Tegmina sliirlitly Ionp;er than broad, the hinder vd^c cut obliquely in 

 a ijentle curve, so that when at rest the combined hinder edp;es form a 

 slight concave curve. AVings 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 

 niinutely 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, subcjuadrate, 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 Avhich 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 tij), the apical half blackish. Length of body 

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

 2.5 mm.; of hind femora, 3.5 mm.; of forcejjs, d, 10.5 mm., 9, 5.25 

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

 mountains about Orizaba, Mexico, under bark in the month 6f Jan- 

 uary. Smithsonian Institution. 



Li 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. 1 also 

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

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



52. Thermastris Chontalia. Head black, the mouth parts 

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

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

 hrasillensis, the first twelve and tliirteen joints blackish fuscous, be- 

 yond growing paler fuscous. Prothorax and tegmina blackisli brown, 

 with very distant, short, stout, tapei'ing hairs; pronotum nearly flat, 

 with a very obscure median longitudinal depression; tegniina 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 witli liairs like those on the tegmina, and squarely docked 

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

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

 browni the femora covered sparsely with spinous hairs, the tiblse and 

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



