XORTll AMERIf'AN COLKOI'TERA. 147 



Differs t'roiu the other species in its minute size, elongate and attenuated 

 iorni, pubescent surface, and close sculpture. 



(Juatemala (Champion). , 



A. polif lllll Matthews Cist. Ent. 2, p. 168, 1877.— L. c. .50 mm.— Oval, con- 

 vex. bliR-k. very sliiiiiiig, very sparingly elotlied with very short hairs ; head rather 

 large; eyes rather small ; thorax small and short, rather wider but not longer than 

 the head, widest at the base: sides slightly rounded, basal margin rounded ; elytra 

 oval, rather longer and wider than the head and thorax, widest before the middle, 

 very shining, very faintly asperate in transverse distinct sinuated rows, apex much 

 rounded, paler : legs and antennjB rather long, pitchy black. 



Differs from A. Crofchnnnnn in its minute size, very shininir. smooth 

 and almost impunctate surface. 



California (Crotch). 



A. Crotchianiini Matthews Cist. Ent. 2, p. 168, 1877. — L.c. .63 mm.— Oval, 



very convex, black, clothed with very short silvery hairs; head large; eyes mod- 

 erate, rather prominent ; thorax short, transverse, not longer, but rather wider than 

 the head, closely and rather deeply punctured, or tuberculate, with a large trans- 

 verse depression near the base; sides rounded, basal margin nearly straight, Iving 

 on the elytra ; elytra ovate, exceedingly convex, wider and more than half as long 

 again as the head and thorax, widest near the middle, closely asperate in trans- 

 verse rows, apex attenuate and rounded, rather pale; legs and antennae rather 

 long and slender, pitchy black. 



Differs from A. politnm in its much larger size, inflated form of the 

 elytra, and in sculpture. 



British Columbia (Crotch). 



PTEWIDIIIM. 



Erichson Nat. Ins. Deutsch. 3, p. 35, 1845. 



Antenn/E 11-jointed, last 3 incrassated, club moniliform. 



Head porrectcd. 



Pronotum rather small. 



Elytra entire. 



Mesosternum short, f^xintly carinated. 



Metastermtm large, quadrate, extending to the sides of the body. 



Venter with 7 segments. 



Legs rather long, tarsi very slender. 



Posterior coxm remote, slightly laminated. 



Synoptic Table of Species. 



Pronotum almost glabrous, with four fovere near the base.-' 



Antennpe pitchy black pill 111 ill. 



Antenna; tlavescent. 



Color of body black, or pitchy black. 



