H. C. FALL 379 



Var. umbrosus new variety 



Upper surface black with a few very small scattered yellowish spots; head 

 and legs obscurely variegated with dull yellow. An extreme rnelanic variety 

 or race which superficially may very easily be confused with a nunil)er of other 

 species unless careful attention be given to the characters. 



Distribution. — The type is one of two males from 8alina, Kan- 

 sas, sent me by Mr. Knaus. 



This species is allied very closely indeed to subfasciatus, in 

 fact there is in the females a complete gradation in color from 

 subfasciatus through impurus to xanthias with apparently abso- 

 lutely no structural differences in either sex. It must, however, 

 be stated that all males that I have seen are either of the typical 

 subfasciatus form (including of course variations in the devel- 

 opment of the pale elytral fascia and spots), or they are of the 

 fusco-variegated form of the male of the true impurus including 

 the melanic extreme — umbrosus. Imjiuriis, xanthias and umbro- 

 sus are almost surely forms of one variable species, but until the 

 males are more perfectly connected I do not feel quite safe in 

 uniting them with subfasciatus. 



62. Pachybrachys calidus new species 



Dull yellow with rather broad fuscous markings, surface finely 

 alutaceous but frequently somewhat shining; eyes separated in 

 the male by about one-half the vertical width of their upper lobes, 

 and in the female by somewhat less than the width of their upper 

 lobes; ocular lines fine, cjuite near the eyes; marginal interspace 

 of the elytra nearly or quite impunctate; front claws of male 

 only slightly larger than the others. Ave. length 3.1 mm. West- 

 ern Texas to Arizona. 



Head not wider than the thoracic apex, moderately punctate, median line 

 feebly or scarcely impressed, markings variable. Eyes separated in the male 

 by the length of the basal antennal joint, in the female by the length of the 

 first two joints or a Uttle more. Antennae (d^) attaining the hind coxae, a 

 little shorter in the female, the tenth joint scarcely more than two and one-half 

 times as long as wide in either sex; outer joints infuscate as usual. 



Prothorax rather strongly transverse in the female, distinctly n'\rrowed in 

 front, widest behind the middle; sides moderately arcuate, more strongly so 

 in the male; punctuation close in the dark areas, side margins smoother; M 

 broad, extending from base to apex leaving two basal spots, a median line in 

 front, and the side margins pale. 



Elytral striae somewhat impressed and distinct outside of the baso-sutvu'al 

 triangle; striae five to six often more or less broken at middle; shield distinct, 



TRANS. AM. ENT. SOC, XLI. 



