AMERICAN PHILOSOPHICAL SOCIETY. 543 



convexity, nearly flat ; near the lateral tip slightly and rather 

 acutely sinuated ; tibiae and tarsi-piceous. 



Length three-tenths of an inch. 



The thorax is longer than that of the preceding species, and 

 the interstitial lines are a little convex, which will readily dis- 

 tinguish it from A. impuncticollis, N. The colors of the antennae 

 as strongly contrast as those of A. vulgaris F. 



9. A. FURTIVA. — Pale; thorax punctured at base ; elytra with 

 punctured striae. 



Inhabits Indiana. 



Body honey-yellow, more or less tinged with dusky ; antennas, 

 palpi and all beneath paler ; head with the frontal impressed 

 lines dilated, distinct ; thorax a little contracted at base, the 

 posterior angles slightly excurved and acute ; dorsal line well 

 impressed, particularly behind the [430] middle ; basal lines 

 deeply impressed and definite, punctured ; impressed lines of the 

 posterior angles, distinct and rather deep, punctured ; base punc- 

 tured ; elytra with punctured striae ; the punctures orbicular and 

 close set; near the tip obtusely, but not deeply sinuated. 



Length less than two-fifths of an inch. 



Resembles the A. fulim, 111., particularly in the form of the 

 thorax. The color has sometimes a very slight metallic tinge, 

 but never so obvious as in ihefuha. 



10. A.? GROSSA. — Alternate interstitial spaces punctured. 

 Inhabits N. W. Territory. 



Body short, robust, convex, blackish piceous; head ; 



thorax convex, descending much each side, transverse, oblong- 

 quadrate ; dorsal line almost obsolete ; anterior transverse line 

 hardly obvious ; basal margin depressed and somewhat rough ; 

 lateral margin depressed, but not elevated except near the poste- 

 rior angles lightly ; elytra with a sinus near the tip ; striae well 

 impressed, impunctured ; interstitial spaces with from five to 

 eight distinct punctures on the third, fifth and seventh spaces ; 

 marginal series of punctures small, almost indistinct. 



Length of thorax and abdomen nine-twentieths of an inch. 



This species I found in the north western part of the United 

 States when traversing that country with Major Long's party. 

 It is a remarkable insect, readily distinguishable by the peculiar 



[Vol. IV. 



I 



