Dec, 1916.] New Species of Elaterid^. 263 



more reddish colored specimens resemble the two previously de- 

 scribed species, substriatits and arizonensis, very much. From suh- 

 striatus it differs in having ditinct elytral striae and longer antennae. 

 Arizonensis is a narrower and more elongate insect having the side 

 pieces of prosternum much more closely punctate than variatits and 

 ventral segments one to four of abdomen with rather numerous large 

 and somewhat perforate punctures at sides of which there are only a 

 few in variatus and much smaller. The metasternum is also much 

 more coarsely punctate than in variatus. 



Orthostethus caviceps new species. 



Very elongate, shining, black ; rather sparsely clothed with short, yel- 

 lowish-cinereous pubescence. Head coarsely and closely punctate, broadly 

 excavate in front ; antennae of male extending to far beyond the hind angles 

 of prothorax; joints two and three small, three a little longer than second, 

 four to ten strongly pectinate, eleventh appendiculate, in the female shorter 

 and strongly serrate. Prothorax slightly wider at base than long, obliquely 

 narrowing to apex, hind angles long and acutely carinate and not incurved at 

 tip, surface closely and coarsely punctate, punctures less closely on the disk, 

 on the median line a more or less distinct smooth space ; thorax in the female 

 a little shorter and broader than in the male with sides near apex arcuate. 

 Elytra a little more than three times the length of prothorax; gradually nar- 

 rowing to a little beyond middle then a little more strongly narrowing to 

 apex ; sutural angles acute ; surface moderately closely and coarsely punctate 

 without striae. Prosternum at apex and sides coarsely and closely punctate, 

 smooth at middle; metasternum coarsely and closely punctate; abdomen 

 moderately coarsely not closely punctate ; last ventral segment at apex feebly 

 emarginate in male, entire in female ; mesosternum moderately raised, subhori- 

 zontal. Length, male, 23.5 mm., width 6 mm. ; female, length 28 mm., width 

 7 mm. 



Huachuca Mts., Arizona (Schaeffer). 



Males of this species were taken frequently by beating oak while 

 females were very scarce. 



This species is very close to the Mexican pectinicornis and may 

 prove on comparison to be the same. The Mexican pectinicornis 

 was described from a single worn example, which may account for 

 the color difference of elytra and underside. The Mexican species, 

 however, is said to be somewhat thickly clothed with short, fine pubes- 

 cence, the hind angles of prothorax incurved at tip and the proster- 

 num coarsely and sparsely punctured, which all does not agree very 

 well with the Arizona specimens. 



