1873.] J** [Horn. 



Body beneath and legs piceous, moderately shining, sparsely punctured 

 and cinereo-pubescent. Length .40 inch ; 12 mm. 



Resembles virgulata in form and in the structure of the antennas of 

 the female. The discovery of the male is necessary to determine its 

 position with certainty. 



One female, Staked Plain, Texas. 



Epicauta. Fab. 



This genus is closely allied to Macrobasis and differs in having the first 

 joint of the antenna; usually shorter, rarely equal to, and never longer 

 than the third ; the second joint is never greater in length than half the 

 third. These characters apply equally well for both sexes. 



The species are moderately numerous in our fauna, and maybe divided 

 for convenience of study in the following manner : 



A. Antenna} similar in thickness throughout, joints cyl- 



indrical and closely articulated. Eyes prominent, 

 coarsely granulated, feebly or not emarginate in 

 front and nearly as wide as long. 

 Pubescence sparse, black and erect. 

 Head and thorax very sparsely punctured and with 



shining surface oblita. 



Head and thorax densely punctured and less shining. p u n etieollis. 



Pubescence usually dense, always recumbent, and 

 generally cinereous, ferruginous or fulvous, some- 

 times nearly black. 

 Head less densejy punctured than the thorax ; 



thorax longer than wide • con volvuli. 



Head and thorax similarly punctured. 



Thorax longer than wide strigosa. 



Thorax as wide as long. 



Surface of thorax equally punctured. 



Pubescence dense concealing the surface color. 

 Thorax moderately shining, rather coarsely 



and densely punctured ferruginea. 



Thorax opaque, more finely and densely 



punctured sericans. 



Pubescence short, sparse; facies pruinose.... pruinosa. 



Thorax with a smooth slightly elevated space on 



each side callosa. 



B. Antenna? scarcely more slender to tip, joints cylin- 



drical. 



Eyes narrow, emarginate in front, very finely granu- 

 lated, not prominent. 



Vertex and occiput longitudinally broadly concave. caviceps. 



C. Antenna; always more slender to the tip, joints loosely 



articulated and always more or less compressed. 

 Eyes always longer than wide (usually twice as 

 long as wide), emarginate in front, less coarsely 

 granulated than in A, and less prominent. j 



