236 TERTIARY INSECTS OF NORTH AMERICA. 



fourtlis tlie length of the femur. The front femur and tibia, wliich are each 

 only 2.25""" long, also indicate a small species, and one that is unusually free 

 from spines, no hairs even being discernible on this front leg. 



Since then other and more perfect specimens have come to hand, in- 

 cluding some a little larger, showing its size to be about that of the recent 

 species referred to. The body has the same general form. The head seems 

 to be a little longer in proportion to its breadth, the eyes perhaps a little 

 smaller, the basal joint of antennae the same. The pronotum is of the same 

 form, but both head and pronotum are only spai'sely clothed with very short 

 hairs. All the winged specimens ai'e females, and the tegmina are about 

 three-quarters the length of the abdomen, much more delicately constructed 

 than in Nemobius, the veins being more frequent and much slenderer ; on 

 the costal field they run perfectly parallel at a slight angle from the lateral 

 angle between the fields ; on the dorsal field they are less numerous, heavier, 

 straight, and parallel, but more frequent and weaker than in Nemobius vit- 

 tatus. The wings are fully half as long again as the aljdomen. The ovi- 

 positor is short, not reaching to the wing tips, slender, and straight. The 

 hind femora are shaped as in Nemobius, hairy, the hind tibijB shorter than 

 the femora, enlarging a little toward the tip, and hairy, but without a trace 

 of spines ; the hind tarsi are about half as long as the tibijie, the first joint 

 longer than the others combined, all of them cylindrical. 



Length of body, 9.5""° ; tegmina, fj""" ; wings, 9.5™" ; ovipositor, 3.5""" ; 

 hind femur, 5""" ; hind tibia, 4.5""" : hind tarsi, 2.5°"". 



Green River, Wyoming. Seven specimens, Nos. 18, 20 (collectetl by 

 F. C. A. Richardson); 4188 (collected by S. H. Scudder) ; and Nos. 135, 

 141, 142 and 144, 143 (collected by Dr. A. S. Packard). 



3. Pronemobius smithii. 



PI. G, Fig. 22. 



Two specimens of this species are preserved, one showing a side view 

 of the whole body, the other a nearly A^entral view of the hinder half ; both 

 appear to be females, but the liinder portion of the abdomen is lost with the 

 ovipositor, the length of which can not be determined, unless some obscure 

 marks behind one of the specimens are to be considered as indicating that 

 it was short as in P. tertiarius. The head as seen on a side view is as long 

 as the pronotum, like which it is very delicately, almost imperceptibly. 



