H. C. FALL 461 



laterally as usual, the short scutcllar striae alone confused, eighth stria not in- 

 terrupted near the base, shield undeveloped, marginal interspace impunctate. 



Pygidium entu-ely black, or with two small and obscure apical rufous spots. 

 Body beneath black, a small rufous spot at sides of last ventral segment in 

 some examples. Legs black, the tibiae brownish piceous. 



Length 3 to 3.4 mm.; width 1.7 to 1.8 mm. 



Distribulion. — Say's locality is ''Missouri," which as is genei'ally known 

 means the plains of Western Kansas and Nebraska extending perhaps to the 

 Rocky Mountains. Nearly all the examples before me are from Colorado viz. 

 Colorado Springs, June 15 to 30, 6,000 to 7,000 feet (Wickham); Garland, June 

 29 (Hubbard & Schwarz), (Nat. :\Ius. Coll.), (LeConte Coll.), July 25 (W. J. 

 Gerhard); "Col" (several collections). Kansas: one d' (Horn Coll. j. 



This species seems to be rare, or at least this is true of the 

 typical form. There is very little in the original description or 

 in the specimens before me to separate it from the suffused varie- 

 ties of autolijcus, and future collecting may establish their identity. 

 In the dark varieties of autolycus — icahsatchensis and difficUis — 

 the pale markings are always bright j^ellow; in nigricornis they 

 are described as "obscure rufous" and this is the case in the speci- 

 mens at hand. In addition to the rufous margin and subsutural 

 vitta mentioned in the description, the raised basal margin of the 

 elytra is dull rufous, and there are detectable in some examples 

 two very small and obscure basal thoracic spots of the same color. 

 Say did not mention these basal spots, but they may very easih' 

 have been overlooked. He does say that ''one or two of the 

 interstitial lines of the elytra are sometimes very obscurely 

 rufous, particularly in the larger females." This is not the case 

 in the specimens at hand. The lateral rufous margin tj'picall}' 

 extends around the apex of the elytra, but is sometimes evanescent 

 posteriorly and may entirely disappear, a fact noted by Say in his 

 description; the thoracic markings may also entirely disappear. 



The Garland, Colorado, specimen in the LeConte Collection is 

 placed with driatus { = paUidipennis Suffr.) and is referred to by 

 LeConte as a black variety of the latter. 



143. Pachybrachys carbonarius Hakleman 



Black, prothorax strongly alutaceous and opaque, more finely 

 punctate than the elytra, the latter dull or feebly shining; eyes 

 very distant, front witiiout ocular lines; front claws of male not 

 enlarged. Ave. length 8 mm. New York and Florida to Kansas 

 and Louisiana. Var. janus — Nebraska to ]\Ianitol)a and the 

 Rocky Mountains. 



TRANS. AM. ENT. SOC, XLI. 



