222 TERTIARY INSECTS OF NORTH AMERICA. 



Length of femur, 17.5 mn ' ; breadth of same, 3.5 mm ; length of hind wings, 

 23.5 mi " ; of longest tibia! spines, 0.8 mm . 



Green River, Wyoming. Two specimens, Nos. 138 and 140, Dr. A. 8. 

 Packard; Xo. ol, Prof. L. A. Lee. Florissant, Colorado. One specimen, 

 No. 14720, collected by Miss C. II. Blatchford. 



2. TVRIH'LA RUSSELLI. 

 PI. 17, Figs. ]-4. 



A couple of excellently preserved specimens, exhibiting a side view, 

 show most of the body, the antenna?,, closed tegmina with underlying wings, 

 front and hind legs, and part of the middle legs. The head is not very 

 prominent, with rounded vertex, moderately full retreating front, eyes rather 

 small, superior, oval, considerably shorter than the distance from their lower 

 edge to the base of the mandibles ; the antenna? are nearly half as long as 

 the body, straight, very slender, the apical fifth expanding to a club of 

 twice the diameter of the stalk, the middle joints of which (Fig. 1) are nearly 

 twice as broad as long and microscopically densely punctate. The prono- 

 tiun is twice as long as the head, the posterior lobe not projecting very far; 

 the tegmina are slender, broadly rounded apically, reaching when closed 

 the tip of the abdomen. The legs are all very slender and delicate, tin- 

 front femora not much stouter than the tibia?, the fore and middle tibia? 

 with a double row of delicate, short, rather frequent spines. The hind 

 femora scarcely reach so far as the closed tegmina, but are slender and 

 graceful, with the middle external h' eld well defined by superior and inferior 

 carino? or angles, with indications of having been twice annulate with narrow, 

 dusky bands in the distal half, the outer annulus midway between the inner 

 and the apex ; hind tibia:-, fully as long as the femora, very slender, armed 

 with a large number (about eighteen to twenty) of delicate tapering spines, 

 considerably longer than the width of the tibia-, but more distant (Fig. 4) 

 than in the preceding species; they are much broken in the specimens. 

 Tarsi with delicate crowded spines. 



Length of body, 23 mm ; of pronotum, 4.5" 1 " 1 ; of antenna;, 10 nun ; width 

 of club, 0.4""" ; length of tegmina, 18""": width of same, 2.7""" : length of 

 fore femora, . r >.5""" ; fore tibia-, 5.25""" ; hind femora, 14.5'""'; width of hind 

 femora, 2"""; length of longest, tibi.-d spine, 0.5""". 



