ORTHOPTERA GBYLLIDES. 235 



I. PRONEMOBIUS INDURATUS. 



I 'I. G, Fitf. 18. 



This species, much the largest of the three here described, is repre- 

 sented by two hind legs and a portion of one of the tegmina, found in prox- 

 imity to one of the legs. The wing, shown in the figure, has a portion of the 

 costal field displayed on the left with three or four parallel veins curving 

 toward the margin, one of them forked an unusual circumstance; and 

 on the right the larger portion of the basal half of the dorsal field, where 

 the simplicity and flowing course of the veins, in which no tympanum 

 is constructed, indicates a female. The neuration, however, is very differ- 

 ent from the prevailing simple type of the Gryllida: proper and much more 

 closely resembles that of the Gryllotalpida- or of some Eneopterida', the 

 oblique veins of the middle of the wing, whose course is toward the lateral 

 margin of the field, being offshoots of a couple of basal veins whose obliquity 

 is toward the inner margin. The hind femora are rather slenderer than 

 usual among Gryllidu?, but not so slender as in the Eneopterida- and allied 

 subfamilies, rather sparsely hairy above and with the outer face dusky, and 

 marked by pale, oblique lines. The hind tibia is present in only one speci- 

 men and a little incomplete, so that one can not say whether it is longer or 

 shorter than the femur ; it is uniformly and rather sparsely haired throughout. 



Length of fragment of wing, 7'""' ; of hind femur, ll-l-_ )mm ; breadth of, 

 same, 3.25"" 11 ; of fragment of hind tibia, 8.5""" ; breadth of same, 0.9"" u . 



Green River, Wyoming. Two specimens, Nos. 136, i;J9, Dr. A. S. 

 Packard. 



2. PKONEMOBIUS TKKTIARIUS. 

 I'l. <>, Figs, i:;, i'l, J3. 



Nemobius trrtiarim Sc.udd., Bull. II. S. Gool. Geogr. Snrv. Tvrr., IV, 774 (1878J. 



This species was first described from legs only, by which it was judged 

 that the insect must have been rather smaller than our common Nemobius 

 \ Hiatus (Han. , its hind femur being 7 mi " long, broad, and stout, especially 

 near the base, where it measures 2.1"""; its upper halt' is covered with ex- 

 ceedingly delicate, n -cum I >ent hairs directed backward: there are also a 

 tew hairs upon the slender hind tibia, which is broken just where it begins 

 to enlarge, showing signs of the upper spines ; this portion is about throe- 



