DYNASTIN.E 213 



5 Body oblong-oval, strongly convex, highly polished; head not quite 

 a third as wide as the prothorax, finely, densely and deeply punctate, 

 the clypeus also with fine transverse rugae; tubercle thin antero- 

 posteriorly, acute and extending laterally scarcely at all, being un- 

 usually abrupt; apical carina very thin, vertically and strongly 

 elevated, and, from above, feebly, posteriorly arcuate, its lateral 

 angles not sharp but distinct, right; sides of the middle joint of the 

 antennal club with three or four fine punctures; prothorax more 

 transverse, two-thirds wider than long, widest at basal fourth, 

 where the sides are evenly and strongly rounded inwardly to the 

 very obtuse basal angles, distinctly converging and evenly, very 

 moderately arcuate thence to the rather sharp apical angles, the 

 apex circularly sinuate as usual; punctures anteriorly shallow, um- 

 bilicate, very dense, becoming coarse and confluent toward the 

 sides thence to the base; throughout the width they are much smaller, 

 very sparse but unequally distributed, nearly wanting in a sublateral 

 discal spot; median line in great part punctureless; scutellum very 

 smooth; elytra evidently inflated behind, fully a fourth wider than 

 the prothorax and more than twice as long, the series of well sepa- 

 rated, shallow, annular punctures broadly and conspicuously im- 

 pressed; pygidium finely, closely punctulate and rugulose throughout, 

 subangulate at apex, where the bead is very thick. Male similar 

 to the female just defined but shorter, the head and tubercle similar 

 but the clypeal apex is much broader though similarly carinate,. 

 the pygidium =imilar throughout and angulate at apex, but 

 with the marginal bead much finer; legs and tarsias in the female.. 

 Length (d 71 9 ) 14.6-16.5 mm.; width 9.5-10.7 mm. Colorado- 

 (Fort Collins) and New Mexico (Fort Wingate) lucidus n. sp. 



Besides the division made above, in regard to outline of the body, 

 into pyriform and oblong species, another division might be sug- 

 gested into species with unimpressed or very feebly impressed 

 elytral striae and species with coarsely sulciform striae, the first 

 including all the species excepting lucidus; in the latter species 

 it may be noted besides, that the sides of the prothorax basally 

 project laterally more beyond the line of the elytral humeri in 

 both sexes; this same character prevails among certain forms of 

 Aphonus as well. 



Aphonus Lee. 



This genus is closely allied to the preceding, having the same very 

 small head and usually completely concealed mandibles, which are 

 minute, laminate, not dentate externally and with the apex finely 

 pointed and slightly everted, but the transverse carina at the clypeal 

 apex is much more retracted and is always tridentate, the median 

 tooth sometimes smaller and feebler than the lateral; the actual 



