NO. 1708. f^TUDIES OF NORTH AMERICAN WEEVILS— PIERCE. 347 



c '. Scutellum very short and broad, not entering the elytral disk. 

 dK Elytral intervals alternating in convexity throughout the length; 

 serial punctures on elytra seldom squamigerous, usually setigerous; 

 first ventral suture slightly arcuate at middle; hind tibiae mu- 



cronate Amnesia Horn. 



rf2. Elytral intervals not alternating in convexity; serial punctures on 

 elytra each bearing a flat scale; first ventral suture straight or but 

 slightly arcuate at middle; hind tibiae more or less feebly mucro- 



nate; corbels open Dyslobus LeConte. 



c^. Scutellum small, triangular; first ventral suture straight; hind tibiae dis- 

 tinctly mucronate; corbels cavernous Melamomphus Horn. 



h'^. First ventral suture fine, not broadly impressed, broadly arcuate; body 

 squamose and pubescent; scutellum distinct; second ventral segment 

 much longer than the next two combined, 



Thricomigus Horn; Adaleres Casey, 

 a^. Metasternal side pieces indistinct, suture obliterated. 



e '. First suture of abdomen deep and widely impressed, straight; sec- 

 ond segment not longer than the two following united; hind 



tibiae not mucronate; corbels open Panscopus Schonherr. 



e^. First ventral sutui-e fine, not broadly impressed, broadly arcuate; 

 second segment as long as and frequently longer than the two 

 following imited; rostrum rather elongate. 

 /^ Rostrum separated from head by transverse depression; body 

 squamose, the elytra without erect hairs, the intervals alter- 

 nating strongly in convexity and vestiture; scutellum ex- 

 tremely small, acute; second ventral segment not longer than 

 the next two combined, metepisternal suture completely 



obliterated Nomidus Casey. 



/-. Front flat, rostrum continuous on the same plane and iisually 

 flattened above; metepisternal suture in great part obliterated. 

 g^. Body above finely tuberculate, scales large, 



Phymatinus LeConte. 

 g ^. Body not tuberculate, scales small and denser. . Nocheles Horn. 



Genus CIMBOCERA Horn. 



CIMBOCERA PAUPER Horn. 



Laramie, Wyoming, March 18, May 20 (Soltaii); Helena, Montana 

 (Hubbard and Schwarz). 

 This species, Hke Amotus, has striate plumose scales beneath. 



CIMBOCERA CONSPERSA Fall. 



American Fork Canyon, Utah, June 25 ; Garland, Colorado, June 

 23 (Hubbard and Schwarz); Canyon City, Colorado, May 14; Gallup, 

 New Mexico; Albuquerque, New Mexico (Soltau); Winslow, Arizona 

 (Wickham) ; Holbrook, Arizona; Bright Angel, Arizona, July 10 

 (Barber and Schwarz) . 



The upper scales are striate, subplumose. 



Genus MILODERES Casey. 



MILODERES SETOSUS Casey. 



Panamint Valley, California, April (Koebele). 



