150 LOXOPROSOPUS. 



the antennae ; between this angle and the labrum (when viewed 

 transversely) is a concave plane depression, extending across the 

 breadth of the anterior surface; at the base also (when viewed 

 laterally) is a transverse depression, which gives a gibbous appear- 

 ance to the surface between it and the insertion of the antennae. 



Thorax broader than the head, transverse, rectangular, in front 

 slightly emarginate ; the sides are broadly marginate, the margina- 

 tion being generally produced into an angle ; the base is transversely 

 subdepressed : in the males the thorax is more quadrate and smaller 

 than in the females. 



Scutellum broadly triangular. 



Elytra parallel, depressed, broader than the thorax, and rounded 

 at the apex ; the surface is equate and punctate-striate, pubescent 

 or glabrous. 



Legs : the anterior femora robust, subparallel, slightly attenuated 

 towards the apex. The tibice are distinctly incurved at their imme- 

 diate base, gradually incrassated towards the apex, and at the ex- 

 tremity transversely truncate. The tarsi are short and broad ; the 

 basal joint being abbreviated, in form broadly triangular ; the second 

 is slightly narrower, and more attenuated at the apex ; the third is 

 broader than the first and bilobed ; these three joints are at their mar- 

 gins and undersides coai-sely pubescent; the terminal joint is elon- 

 gated and incurved, situated at the base of the third, and subdilated 

 towards the apex : the claw is robust, bifid, and armed at its inner 

 surface with a strong blunt spur. The posterior femora are short 

 and (when viewed transversely) broadly dilated, tapering towards 

 the apex, which is truncate. The tibice are robust, slightly incurved 

 at their immediate base, and at the apex broadly flattened out into a 

 socket, which receives the insertion of the tarsus. The tarsus is short 

 and attenuate ; the first joint being narrow, less produced than the 

 second, and subdilated at the apex ; the second is more elongate ; 

 the third subovate ; and the terminal joint produced into a globular 

 inflation, which completely conceals from above the apical claw. 



The Saperda-likc head and general fades, as well as the enormous 

 length of the antennae of the insects of this group, suggest at once 

 the propriety of removing this genus entirely away from the Phy- 

 tophaga, and placing it among the Longicornia ; and, indeed, if the 

 only data from which we coidd form an opinion as to its true posi- 

 tion were, on the one side, the head and antennae of a Longicorn, 

 and on the other, the incrassated posterior femora of the group of 

 Halticidae, it would perhaps be difficult to decide as to which it had 

 the most affinity : for while many of the Galerucidac (i. e. Luperns, 

 and, to some extent, Calomicrus) show a manifest tendency to an 



