418 AMERICAN PACHYBRACHYS (cOLEOPTERa) 



Head not appreciably wider than the thoracic apex, but the eyes are some- 

 what prominent and intersected by the sides of the prothorax if produced. 

 The front may be regarded as dull rufo-testaceous with heavy black standard 

 markings, but the paler areas are small and very obscure. Antennae moder- 

 ate, attaining the hind coxae in the male, black, brownish rufous toward the 

 base, tenth joint scarcely three times as long as wide. 



Prothorax moderately transverse, widest at about the basal fourth, sides 

 moderately arcuately convergent in front, surface densely, a little unevenly, 

 punctate, with small scattered more convex smooth areas; sides in the male 

 with a narrow, smooth, dull, rufo-testaceous or rufo-piceous margin; in the sin- 

 gle female associated, without smooth margin, the punctures dense to the ex- 

 treme edge. 



Elytral punctuation scarcely coarser on the average than that of the pro- 

 thorax, in great part irregular, the eighth stria entire and distinctly impressed, 

 the seventh traceable, the others feebly impressed, represented only in a frag- 

 mentary way and most noticeable on the convexity; shield indistinct or want- 

 ing; marginal interspace with a few punctures at base only in the male, punc- 

 tured throughout in the female. In the male the raised basal margin is in 

 part rufous and there is a very obscure apical spot in one example. 



Body beneath and legs black or piceous, the ends of the femora gradually 

 more or less rufo-piceous. 



Length 2.8 to 3 mm.; width 1.6 mm. 



Distribution. — Arizona: (Am. Ent. Soc. Coll.), 2 males, 1 female. 



The female is the smallest of the three examples and is entirely 

 black. This species is in most respects very like stygicus, but is 

 a little shorter and stouter in form, with the elytral striae more 

 evident and the sides of the thorax scarcely at all smoother in the 

 male. The form and color is greatly like that in certain specimens 

 of signatifrons; the latter, however, is distinctly shining, the elyt- 

 ral striae much better defined and the front claws of the male a 

 little larger. 



100. Pachybrachys cephalicus new species 



Robust, fuscous and dull yellow mottled, the former color 

 predominant on head and prothorax, the latter (typically) on the 

 elytra; lustre dull; punctuation dense and largely confused; ej^es 

 more prominent than the front angles of the prothorax, moder- 

 ately widely separated, ocular lines wanting; front claws of male 

 not appreciably enlarged. Ave. length 3.1 nini. (uilf ami Atlan- 

 tic Coast States. 



ffc/iil closely punctate, maculation heavy, eyes separated by about twice the 

 length i)f the basal antennal joint in th(^ mak', and by about two and three- 

 fourtlis times the length of lh(^ bas;il joint in tlic female. Antennae thin, 



