THE LEAF BEETLES. 



1125 



Vigo County; rare. June 11. 

 tea. Dury has taken G. equestris 

 the elytra yellow, with black spots 

 tured. 



Taken from flowers of Jersey 

 Oliv. near Cincinnati. It has 

 and the thorax sparsely punc- 



XVI. Pacitybrachys Chev. 1834. (Gr., " thick .+ short.") 



To this genus belong a large number of small, compact, subcylin- 

 drical species having the basal marginal line of thorax distinct; 

 presternum feebly channeled; inner rows of elytral punctures usu- 

 ally completely confused, the outer ones tortuous or irregular, sepa- 

 rated by more or less interrupted ridges; front thighs distinctly 

 stouter than hind ones. A number of the species vary greatly in 

 color and merge from one form gradually into another, so that they 

 are very difficult to classify. Of the 50 or more species known 

 from the United States, the following have been taken in Indiana : 



KEY TO INDIANA SPECIES OF PACHYBRACHYS. 



a. Upper surface uniform black, densely punctured. 



&. Upper surface pubescent; punctures of elytra everywhere much con- 

 fused; size larger, 4-4.5 mm. 2075. morosus. 

 bb. Upper surface glabrous. 



c. Punctures of elytra mostly in distinct rows; smaller, 2.5-3.5 mm. 



2070. CARBON ARIUS. 



cc. Punctures confused over the greater part of surface ; length 3.2- 



4 mm - 2086a. var. nigrinus. 



aa. Upper surface not uniform black. 



d. Colors of upper surface definitely arranged. 



e. Thorax and elytra black, each with narrow ivory-white marginal 



lines - 2077. ELEGANS. 



cc. Disk of thorax or elytra with spots or stripes. 



./. Elytra with stripes ; colors yellow and black or brown. 

 g. Elytra with rows of punctures in great part well defined. 

 h. Thorax yellow with an M-shaped brown spot (rarely black 

 with narrow, pale margins) ; elytra with suture and two 

 broad stripes on each, black. 2078. litigioscs. 



lib. Thorax black with margins and narrow median line from 

 front edge to middle, yellow. 2079. othonus. 



gg. Elytral punctures confused, the two outer rows distinct ; ely- 

 tra yellow with suture, broad oblique stripe, narrow outer 

 margin and three spots on sides, black. 2080. bivittatus. 

 ff. Thorax or elytra with spots, 



i. Colors black and red ; rows of elytral punctures very irregular 

 at sides and behind middle; thorax black, usually with mar- 

 gins and two basal spots red. 20S1. trinotatus. 

 ii. Colors black and yellow. 



