448 MEMOIRS ON THE COLEOPTERA 



moquinus; antennae longer, the outer joints but slightly wider than 

 long; prothorax very feebly obtrapezoidal, as long as wide, much 

 narrower than the head, the sides straight, arcuate at apex, the base 

 circular; series of four punctures as in moquinus; scutellum of the 

 usual large and acutely ogival form, rather strongly, densely punc- 

 tate, impunctate at the margins and apex; elytra subquadrate, 

 longer and much wider than the prothorax, wider than the head, the 

 punctures rather small but strong and widely separated; abdomen 

 finely, sparsely punctate, the sixth ventral nearly as in moquinus. 

 Length (cf ) 6.7 mm.; width 1.6 mm. Arizona (Prescott). 



quadrifer n. sp. 



Coloration throughout as in the two preceding species, except that on the 

 upper surface the black apex of the abdomen is more gradually 

 formed involving most of the fourth tergite, as well as those posterior; 

 on the under surface, however, the black apex may involve the two 

 or three last segments; shining, non-metallic; head (c/ 1 ) deep black, 

 subquadrate, almost as long as wide, the eyes at more than twice 

 their length from the base, the punctures laterally very few in 

 number, equally remote throughout; antennae short, very thick, the 

 outer joints transverse; mandibles almost evenly arcuate throughout; 

 prothorax small, very much shorter and narrower than the head, as 

 long as wide, obtrapezoidal, the sides evenly and rather strongly 

 arcuate; seiies of three punctures short and anterior; surface almost 

 black, the periphery more or less pallescent; scutellum obscure rufous, 

 rather finely, closely punctate; elytra subquadrate, much longer and 

 wider than the prothorax, the punctures fine and sparse; abdomen 

 finely, sparsely, subasperately punctate; sixth ventral (c?) with a 

 broad, shallow and obtusely cuspidiform apical sinus. Female very 

 much smaller than the male, w r ith less developed head but nearly 

 similar otherwise. Length (cf 9 ) 7.0-10.2 mm.; width 1.3-1.75 

 mm. Arizona (Benson Dunn and Sta. Rita Mts. Wickham). 

 Ten specimens arizonicus n. sp. 



7 Body slender, rather small in size, very shining; head (d 71 ) transversely 

 quadrate, the lateral punctures few in number and remote, strong; 

 anterior canaliculation short, broad and deep, the mandibles long, 

 straight, gradually arcuate and finely aciculate apically; eyes slightly 

 convex, at more than twice their length from the base; antennae 

 slender basally, not very thick apically, rather long and blackish, 

 picescent basally, the last joint paler, the outer joints but slightly 

 wider than long; gular suture single throughout; prothorax subquad- 

 rate, nearly as long as wide, much narrower than the head but about 

 as long, the sides feebly converging from apex to base and nearly 

 straight; punctures all coarse, the series of five to seven rather close- 

 set; scutellum densely punctate, with narrow impunctate margins; 

 elytra with small, strong and widely separated punctures and some 

 scattered setae; abdomen strongly punctate, closely so basally and 

 remotely apically on each segment; sixth ventral with a small, 

 rounded and rather deep sinus, not twice as wide as deep. Female 

 like the male but with the head narrower, not distinctly wider than 

 the prothorax, the mandibles shorter, the antennae much shorter and 



