REVISION OF LISTROCHELUS — SAYLOR 65 



14 (13). Surface of sixth abdominal segment strongly ascending 



(fig. 2, d), apex deeply, narrowly cleft, producing a 

 bidentate apex; hind trochanters hardly or not pro- 

 duced (fig. 4, b) (genitalia fig. 7, e, j) scoparia (LeConte) 



Sixth abdominal with a moderately high, strong, trans- 

 verse carina, the latter slightly curved and running 

 nearly total width of segment (fig. 2, e), edges of carina 

 at each side of segment highly angulate; hind trochanters 

 very stronglj' and narrow!}^ produced (fig. 4, a) (genita- 

 lia fig. 9, d-b) trochanter, new name 



15 (13). Only outer front tarsal claw with a large and definite tooth 



just before apex 16 



Both front tarsal claws with pectinations of approximately 



equal size and no teeth before apex 19 



16 (15). Sixth ventral with small, moderately dense granules; outer 



claw of middle tarsus usually with small subapical tooth; 

 hair on abdomen (in lateral view) moderately long and 

 fairly dense; pygidium highly polished, very convex 



(genitalia fig. 8, j-l) plena (Fall) 



Sixth ventral without trace of granules; outer claw without 

 any larger tooth; hair of abdomen very short or obso- 

 lete, rather sparse if present; pygidium usually with at 

 least the basal half pruinose, slightly to moderately 

 convex 17 



17 (16). Genitalia in lateral view with entire apical margin evenly 



and slightly reflexed (fig. 8, d-f) mucorea (LeConte) 



Genitalia in. lateral view with apical margin only slightly 



reflexed and that at about middle 18 



IS (17). Apical margin of genitalia in lateral view reflexed slightly 

 below center into a short lobe, remainder of margin not 



reflexed (fig. 8, g-i) pulcher (Linell) 



Apical one-third of margin reflexed; general form in lateral 

 view (fig. 8, a) quite different from that of either pulcher 

 or ymicorea (fig. 8, e, q) reinhardi, new species 



19 (15). Elytra testaceous, prothorax rufous; surface never prui- 



nose; clypeus and head very densely punctured; antennal 

 club obviously longer than the funicle; sixth abdominal 



with deep longitudinal sulcus 20 



Elytra rufobrunneous to rufopiceous, usually at least 

 slightly pruinose, especially on elytra; clypeus and front 

 moderately densely, not rugosely p.unctate; sixth ab- 

 dominal without or with but a very faint indication of 

 a longitudinal sulcus; antennal club equal to, or shorter 

 than, funicle 21 



20 (19). Antennal club eciual to funicle or not more than one-fifth 



longer than the latter; clypeus plane at center base (geni- 

 talia fig. 10, a-d) flavipennis (Horn) 



Antennal club one-fourth to one-third longer than funicle; 

 clypeus usually strongly tumid at center base, at least 

 noticeably so (genitalia fig. 10, e-h) granti, new species 



21 (19). Elytra coarsely punctured and rugose, never more than 



faintly pruinose; thorax rufocastaneous; sixth abdominal 

 segment with longitudinal sulcus moderately impressed, 



