382 AMERICAN PACHYBRACHYS (cOLEOPTERA) 



65. Pachybrachys wenzeli new species 



Robust, varying from almost entirely black to yellow, more or 

 less heavily maculate and irrorate with l^lack; prothoracic punc- 

 tuation nearly equally dense to the extreme margins, elytral 

 punctuation largely confused; eyes in the male less distant than 

 the vertical width of their upper lobes; front without ocular lines; 

 front claws of male a little larger than the others. Ave. length 

 3.8 mm. Arizona to El Paso, Texas. 



Head not wider than the thoracic apex, markings heavy, sometimes so 

 broadly diffused as to leave only a few small yellow spots, the dark areas 

 densely punctate. Eyes in the male separated by about four-fifths the width 

 of their upper lobes, or by the length of the basal two joints of the antennae or 

 slightly more, in the female by a distance greater than the width of their upper 

 lobes or rather more than twice the length of the basal joint of the antennae. 

 Antennae fully three-fourths as long as the body in the male, the tenth joint 

 about three times as long as wide, shorter as usual in the female, pale at base, 

 outer joints dusky. 



Prothorax moderately transverse, relatively a little longer and more dilated 

 posteriorly in the male, distinctly narrowed in front, sides strongly rounded 

 behind the middle, especially in the male, widest at about basal third, punctua- 

 tion dense throughout, side margins not smoother; AI heavily marked, leaving 

 three discal spots and side margin yellow, the discal spots sometimes reduced 

 to mere dots, or the surface may become entirely black. 



Elytra but slightty wider than the prothorax, densely more coarsely punctate 

 than the latter, striae scarcely evident except along the side margin and some 

 short remnants on the rear convexity; shield wanting; eighth and sometimes 

 the seventh stria distinct and more or less impressed; marginal interspace 

 punctate; markings heavy, the lateral spots usually separable, the inner ones 

 less distinct and more or less diffuse and comiected with each other or with the 

 lateral spots; entire surface sometimes black irrorate with numerous small yel- 

 low spots, or occasionally entirely black. 



Pygidium black, with or without apical yellow spots; body beneath black, 

 the last ventral segment sometimes margined with yellow. Legs variable, 

 thighs yellow with blackish spots, the tibiae pale at base, in the lighter colored 

 examples; in the darker ones the legs may be black with the femora at base 

 alone paler. 



Length 3.4 to 4.3 mm.; width 1.9 to 2.6 mm. 



Distribution. — Arizona: This is appai*ently an abundant species in the 

 Huachuca, Chiricahua and Santa Rita Mountains of Southern Arizona, where 

 it has been taken by H. A. Wenzel, Skinner, Beyer, Schaeffer, Snow, Hubbard 

 and Schwarz and perhaps others — May to August. The type (cf ) was taken 

 by Wenzel in the Huachuca Mountains. The following localities are also rep- 

 resented: Williams, May and June (Nat. Mus. Coll.), also collected by myself . 

 July 3; Prescott (Snow Coll.); Pinal Mountains (Wickham). New Mexico: 

 Silver City (Dury). Texas: EI Paso (Am. Ent. Soc. Coll.). 



