Oct., '02] ENTOMOLOGICAL NEWS. 24! 



Caudal width of pronotum . 5. mm. 



Length of caudal femora . . 10.5 ' 

 Length of caudal tibiae . . 10. " 



Plirixocnemis hastiferus n. sp. 



Type: 9 , Arizona. Coll. U. S. National Museum. 



Allied to P. bcll/cosus Scudder from Colorado, but differing 

 in the much larger size, in the spined caudal carina of the 

 median femora, the presence of S instead of 3-4 raised points on 

 the caudal edge of the dorsal aspect of the caudal femora, 

 in the presence of 8 pairs of spurs on the caudal tibiae instead 

 of 6 as in the related species, and also in numerous other minor 

 characters. 



Size large (largest known species of the genus). Head subovate as 

 viewed from the cephalic aspect ; vertex smooth, connecting with the 

 frontal region by a narrow ridge ; eyes subovate, the axis inclining in- 

 ward. Pronotum sub-uniform in width, the cephalic border emarginate 

 centrally ; ventral border of the lateral lobes broadly rotundate. Cepha- 

 lic and median femora compressed ; the former considerably bowed and 

 bearing a number of spines on the cephalic margin ; the latter with the 

 cephalic margin with 2 to 3 spines, the caudal margin with 3 to 4 spines, 

 the distal portion of the limb bearing a stout, blunt genicular spine. 

 Cephalic tibia: with the dorsal surface unarmed, the ventral borders bear- 

 ing three pairs of spines besides the apical spurs. Median tibue bearing 

 four pairs of spines on the dorsal face, the ventral border being supplied 

 with three pairs of rather small spines located on the distal half, all these 

 spines being extra-apical. Caudal femora robust, the ventro-lateral bor- 

 der bearing 11-13 spines in a group on the distal portion, the dorsal por- 

 tion having 8 raised joints placed on the internal face ; tibue broad, the 

 dorsal face flat, the lateral margins bearing S pairs of spurs besides the 

 interspersed spines of the second order ; first tarsal joint considerably 

 longer than the fourth. Ovipositor straight, suddenly upturned at the 

 apex, the inner valves each bearing four recurved hooks. 



General color ochraceous, of a golden tint in the medio-ilms.il n -ion, 

 dull whitish beneath. Lateral portions of the pro-, nit-so- and metanotum 

 washed with whitish, the margins pellucid. Longer spines tipped with 

 brownish black. 



Measurements : 



Total length 19. mm. 



Length of pronotum . 5. 



Width of pronotum . 7. 



Length of caudal feinoia \2. 



Length of caudal tibiae . 95 ' 



