266 DAVENPORT ACADEMY OF NATURAL SCIENCES. 



carpentcrii, in each case a single male. These apparently differ only 

 in that the tibise of the latter are much more decidedly clavate. But 

 this, as well as the gibbosity of the pronotum of the male and the size 

 of the club of the antennfe, is a variable character, as I have ascer- 

 tained from the examination of many specimens. 



Hab. The great plains east of the Rocky Mountains, from Da- 

 kota to New Mexico, and eastward to Western Kansas and Nebraska. 



2. GOMPHOCERUS CLEPSYDRA, Scud. FigS. 27a, 27b. 



Gomphoceriis clepsydra, Scud., 1876. U. S. Geol. Surv. W. 100 Mer , 

 App. II, 506. 



Gomphoceriis clepsydra, Bruner. 3rd Rept. U. S. Ent. Com., 56. 



Gomphoceriis clepsydra, Bruner. Rept. Com. Agr. , 1885. 



This species is, not improbably, a form of the preceding very varia- 

 ble species, but I have not sufficient material in this species to settle 

 the point to my satisfaction. The United States National Museum 

 contains one of Scudder's types (a male from New Mexico). In the 

 same collection there is also a type of Scudder's Gomphoceriis anten- 

 fiaria, which is identical with the species just described. I have not 

 included G. antentiaria in the synonymy of G. clepsydra as I do not 

 know where it was described, if it has been described at all. My rec- 

 ollection is that Dr. Scudder has at some time informed me that no 

 description of it was ever published. 



Hab. The great plains east of the Rocky Mountains, from British 

 America to Northern New Mexico, and as far east as Kansas and Ne- 

 braska. The species is said by Bruner to be common in the Yellow- 

 stone Valley. 



XXVIII. PNIGODES, n. gen. Fig. 28. 



Head disproportionally large for the pronotum, it as well as the rest 

 of the body being decidedly wider than the latter at its posterior mar- 

 gin. It exceeds the pronotum in length by about the length of the 

 vertex in front of the eye. The scutellum of the vertex is nearly hor- 

 izontal, deeply excavate and bounded anteriorly with distinct straight 

 walls which meet at an angle of 90 degrees (female) or less (male). 



The frontal costa is regularly acuminate and sulcate above to the tip 

 of the vertex, regularly divergent (male) or slightly and abruptly ex- 

 panded below the ocellus (female). The lateral foveolte, plainly visi- 

 ble from above, are sub-rhomboidal, very slightly narrowed anteriorly. 



