NORTH AMERICAN COLEOPTERA. 175 



moderate, anterior and middle tibite scarcely broader at apex, outer 

 edge rounded. Posterior femora broadly thickened, posterior tibia? 

 very little broader at apex, the outer edge faintly unicarinate, ob- 

 liquely truncate at apex, without sinuation or tooth, terminated by 

 a small spur ; tarsi moderate in length, first joint slightly broader 

 externally, second equally broad, triangular, fourth deeply bilobed. 

 Last joint of posterior tarsi globosely inflated at apex, claws appen- 

 diculate at base. Form short, like a robust Lema, body above finely 

 pubescent. 



This genus is suggested for a small species described by Dr. Le- 

 Conte as Hypolampsis guttata, but the open anterior coxal cavities 

 not only forbid its retention in that genus, but in the group to which 

 it belongs. 



There seems to be a parallel arrangement of groups of genera in 

 which the anterior coxal cavities are either open or closed, each 

 group possessing in turn an added character alike in the two series. 

 The Monoplati have closed cavities, and the inflated fourth tarsal 

 joint. In the present genus we have the open cavities and inflated 

 joint. In the Q^dionyches we have open cavities and inflated joint, 

 but the surface is glabrous, elytra confusedly punctate and thorax 

 not much narrower than the elytra. There still remains to be dis- 

 covered an Q'jdionychoid genus with closed coxal cavities. 



P. guttata Lee— Form rather robust, piceous, feebly shining, clothed with 

 fine fulvous pubescence, forming an irregular pattern. Antenuse pale yellowish 

 brown. Head reddish yellow, rather coarsely and closely punctate. Thorax 

 quadrate, slightly broader than long, sides feebly arcuate, base arcuate at middle, 

 very slightly oblique each side, disc convex, densely not coarsely punctate ; finely 

 pubescent. Elytra nearly twice as wide at base as the thorax, humeri obtusely 

 prominent, umbone moderately prominent, disc convex, a vague oblique impres- 

 sion on each elytron, moderately deeply punctato-striate, the punctures moder- 

 ately coarse and serrate, intervals convex, scarcely wider than the striae, ex- 

 tremely finely punctulate ; surface with fulvous pubescence forming a broad 

 space at apex, and on the disc a humeral space, an oblique baud in the depression 

 and an oval space behind it. Body beneath rufesceut, abdomen paler, with close, 

 fine punctuation and pubescence. Legs yellowish testaceous. Length .08 inch. ; 

 2 mm. 



In the male the last ventral segment is broadly emarginate at 

 middle. 



The form of this insect resembles Hypolampsis somewhat, but 

 more closely some of the short Lema, or even certain of our Xylo- 

 philus. 



Occurs near New Orleans, Louisiana. 



