H. C. FALL 363 



45. Pachybrachys uncinatus new species 



Very similar in essential characters to texanus, from which it differs as fol- 

 lows. The size is distinctly larger, the yellow ground color a little paler, the 

 punctures and markings darker, being uniformly blackish fuscous in all males 

 of the series before me, but somewhat less dark in the single female. Eyes 

 slightly less approximate than in texanus, being separated by about three- 

 fourths the length of the basal antennal joint in the male, and by just visibly 

 more than the length of this joint in the female. The male sexual develop- 

 ment of the front tibiae is nearly identical with that in texanus but the tibiae 

 seem a trifle more widened apically, while the spur at the inner angle is not 

 quite as long. The posthumeral sinuation or interruption of the submarginal 

 elj'tral stria is here the rule, while in texanus it is the exception. The front 

 claws of the male are evidently a little larger than the others but the difference 

 is not quite as marked as in texamis. The pronotal standard markings are well 

 developed, but as a rule the elytral spots are small, the posterior ones con- 

 sisting generally of broader fuscous streaks along the striae. The punctua- 

 tion of the elytra is rather dense and confused in a broad baso-sutural tri- 

 angle, the striae defined at sides and rear; shield well developed. 



Length 2.9 to 3.5 mm. 



Distribution. — Arizona: Four males, one female sent by Mr. Schaeffer. 

 The type is a male. A female from Tucson, Apr. 21 (Hubbard & Schwarz), 

 appears to belong here. 



46. Pachybrachys pectoralis Melslieimer 



Form — especially of the male — narrower than usual; dull 

 yellow, maculate with brown or black, not or scarcely shining; 

 eyes narrowly separated, ocular lines present; front tibiae sinuate 

 on the inner margin beyond the middle, front claws of male 

 obviously though not greatly enlarged. Ave. length 2.5 mm. 

 Northeastern States, extending to Georgia and westward to 

 Iowa. 



Head small, unevenly punctured, yellow, a brown central line connected 

 with a small vertex spot; ocular lines usually rather fine, but somewhat variable. 

 Eyes separated in the male by about three-fourths the length of the basal 

 antennal joint, and by very little more than the length of this joint in the 

 female. Antennae moderate, about two-thirds ( cf ) or one-half ( ? ) the length 

 of the body, outer joints blackish. 



Prothorax moderately narrowed in front, widest behind the middle, sides 

 slightly convergent and a little sinuate before the hind angles, surface rather 

 thickly but somewhat unevenly punctate, side margins smooth ; standard spots 

 fairly distinct, the general impression given being a transverse basal row of 

 three spots, and anterior to these a spot each side of the middle, often reaching 

 nearly to the apical margin. Elytra rather conspicuously wider than the 

 prothorax, rather deeply striate externally and on the posterior convexity, 

 punctures confused in a scutellar area of variable size, the striae much broken 



TKANS. AM. ENT. SOC, XLI. 



