390 AMEBICAN PACHYBRACHYS (cOLEOPTERA) 



the sexual tibial character of the male at once identifies it. In 

 this particular it is almost unique, texanus and uncinatus only 

 possessing a similar structure. In these two, however, there is no 

 subapical tooth and the eyes are much more approximate. Cal- 

 caratus is apparently rather rare or else quite local as it is repre- 

 sented in but few collections that I have seen. 



* 



74. Pachybrachys cylindrieus Bowdit ch 



Light yellow, prothorax and elytra strongly shining, the alu- 

 taceous sculpture either lacking or so fine as to be scarcely'' detect- 

 able; standard markings present, the spots as a rule quite sharply 

 defined and rather small, the prothoracic M extending from base 

 to apical two-fifths or one-third, rarely beyond. Eyes more 

 distant in the male than the width of their upper lobes, front 

 without ocular lines; elytral striae scarcely impressed and much 

 confused; front claws of male strongly enlarged. Ave. length 

 3.75 mm. Utah to southeastern California. 



Head as wide as the prothoracic apex, front mostly yellow, finely and sparsely 

 punctate, supra-antennal spots nearly wanting, triangular frontal spots rather 

 small and narrowly connected with the broad black vertex spot, the latter 

 closely punctate. Eyes separated by twice the length of the basal antenna! 

 joint in the male, and by fully three times the length of this joint in the female, 

 or in the latter sex by a distance as great as the entire length of the eye. An- 

 tennae very long and slender in the male, nearly or quite attaining the elytral 

 apex, the tenth joint four to five times as long as wide; in the female not more 

 than two-thirds as long as the body, the tenth joint about three times as long 

 as wide. 



Prothorax less transverse than usual, apex a little narrower than the base, 

 sides moderately arcuate behind the middle, a little incurved basally, surface 

 sparsely finely punctate except in the darker areas, the latter variable in devel- 

 opment, sometimes nearly wanting, again black and sharply defined, never very 

 broad, and rarely extending in front of the apical third; the central stripe dis- 

 tinctly forked in front and usually joining the lateral arms so as to enclose two 

 basal pale spots. 



Elytra rather sparsely and finely punctured, the striae much broken, two and 

 three usually entire, seven more or less regular, eight well defined and some- 

 what impressed; shield small or moderate, marginal interspace impunctate or 

 with one or two punctures near the middle; outer standard spots distinct, not 

 large; posterior inner spot joining the outer to form a distinct transverse fascia; 

 the middle inner spot forming an oblique projecting si)ur from this fascia; 

 anterior inner spot often more or less vague or diffuse. 



Pygidium black and yellow. Body beneath black, with the fianks of the 

 prothorax, metasternum in part, and sides and apex of abdomen more or less 

 pale. Legs almost entirely pale yellow. 



