COLEOPTERA. 287 



Pasimachus, Bon, 



Approximates to the last in the jaws, which are straight, and 

 destitute of a terminal hook. 



The antenna are of equal thickness. The body is much flattened 

 and oval, thorax cordiform, broadly truncated behind, almost as 

 wide at its posterior margin as before and as the base of the elytra; 

 this margin almost straight, and merely somewhat concave in the 

 middle. This subgenus is peculiar to America(l). 



According to Count Dejean — Spec, II, p. 471 — after the Pasi- 

 machi, should come his genus Scap.terus, formed with a species 

 from the East Indies, sent to him by one of the most zealous of the 

 French entomologists, M. Guerin, to whom it is dedicated. Wheth- 

 er the maxillae resemble those of the preceding subgenus I do not 

 know, but the body is differently proportioned, being elongated and 

 cylindrical. The antenna are shorter in proportion than usual; the 

 second joint is square, somewhat thicker than the others, which are 

 short, almost square, and become gradually stouter. 



In the following the maxillae are arcuated and hooked at the end. 

 The antennae become sensibly thicker towards the extremity. The 

 thorax is always separated posteriorly from the base of the elytra by 

 a well marked space or angle. 



Here the exterior palpi are terminated by an almost cylindrical 

 joint, not narrowed into a point at the end. 



ACANTHOSCELIS, Lat. 



This subgenus is remarkable for the four posterior tibiae, which are 

 short, broad, arcuated, plane and slightly concave on their internal 

 face, convex, and covered with granules or little spines on the oppo- 

 site one, with the superior edge dentated, and the posterior teeth 

 large and compressed; the trochanter of the two posterior thighs is 

 very large. 



The body is short, wide, convex above; the thorax transversal, 

 rounded laterally, and its posterior margin sinuous; spurs of the an- 

 terior tibiae very long, and the others almost laminiform. 



(1) Refer to this subgenus the Scarites depressus, and Sc. marginatus. Fab. and 

 Oliv. See the Spec Gen. des Coleop. I, p. 405; the Entomological Observations 

 of Bonelli: and the work of Palisotde Beauvois on the Insects collected by him 

 in America and Africa. 



All the Pasimachi hitherto discovered are peculiar to North America. But four 

 species are known, the P. depressus, marginatus, sublasvis, and die P- subsulcatus. 

 Say. Am. Ed. 



