1909.] NATURAL SCIENCES OF PHILADELPHIA. 133 



As no single type or pair of types of virgata was originally designated, 

 and the original diagnosis being too brief to give any assistance, the 

 selection as typical virgata of either species known to exist in the 

 type series is open to us, and in view of Mesilla, New Mexico, standing 

 first in the list of localities the Rio Grande form is here selected as true 

 Paropomala virgata. 



To assist in the work of determination a key to the species in hand 

 was constructed which is here reproduced to aid future workers. As 

 stated above all the species have been examined except P. dissimilis 

 Bruner. 



A. — Tegmina not reaching tip of abdomen or even tip of caudal 



femora; subgenital plate of male elongate, half as longjagain 



as the last ventral segment. 



B. — Antennae of female as long as the caudal femora ; eyes smaller, 



the interocular space in the male decidedly more than 



half the length from that region to the apex of the 



fastigium; caudal femora longer, 



wyomingensis (Thorn.) [cylindrica Bruner]. 

 BB. — Antennae of female shorter than the caudal femora; eyes 

 larger, the interocular space in the male less than half 

 the length from that region to the apex of the fastigium ; 

 caudal femora shorter, .... calamus Scudd. 

 AA. — Tegmina surpassing the tips of the caudal femora, generally 

 reaching the apex of the abdomen and in some cases sur- 

 passing it. Subgenital plate of male (at least in the species 

 where known) not very long, hardly longer than the last 

 ventral segment. 

 B. — Form rather slender or moderately robust (for the genus), 

 slightly compressed; head moderately produced. 

 C. — Tegmina of male hot exceeding the apex of the abdo- 

 men; occiput more or less appreciably inflated; 

 caudal limbs rather slender; cerci styliform, com- 

 paratively slender. 

 D. — Size larger (body of male 18.5-24 mm., of female 

 27-36.5 mm.); antenna? more depressed pro- 

 portionately; caudal margin of the disk of the 

 pronotum arcuate; metazona more than two- 

 thirds the length of the prozona, pallida Bruner. 

 DD. — Size smaller (body of male 16 mm.); antennae 

 less depressed proportionately; caudal margin 

 of the disk of the pronotum very bluntly obtuse- 

 angulate; metazona two-thirds the length of 

 the prozona, . perpallida Rehn and Hebard. 

 CC. — Tegmina of male exceeding the apex of the abdomen; 

 occiput not appreciably inflated; caudal limbs 

 proportionately more robust; cerci styliform, mod- 

 erately robust, virgata Scudder. 



