48 WILLIAM G. dip;tz, m. d. 



ull of them the alternate elytral interstices ah)ne are setigerous. 

 The antennal grooves expand greatly at their distal extremity (ex- 

 cept porcellus), the scape of the antennre impinges against the middle 

 of the eye (except porcellii.s) and the antennal club is rather more 

 broadly oval than usual. Thorax with a smooth dorsal line (except 

 myasellus). The anterior tarsi are shorter and stouter, with the third 

 joint distinctly dilated in the % . 



The species are closely related and difficult to separate ; the fol- 

 lowing table, supplemented by the description, will, I hope, enable 

 the student to identify them : 



Thorax not carinate, pubescence uniform, cinereous, hair like — in^f'asellusi. 

 Thorax carinate, at times very indistinctly. 



Humeri very prominent, rounded and subangulated posteriorly ; pubescence 

 coarser. 

 General appearance liglit colored ; tliorax scarcely wider than long. 



luirabilis. 

 General appearance darker : thorax distinctly wider than long. 



vittaticollis. 

 Humeri less prominent, rounded, not subangulated behind ; ])ubescence finer. 

 Scrobes ill defined and expanded posteriorly. 



Thoracic carina broader, irregular, abbreviated before and behind. 



Densely pubescent, subopaque .liuniilis. 



Pubescence very sparse, shining aiitliraeiiiiis. 



Thoracic carina entire, linear <'aliforiiicus. 



Scrobes sharply defined, only moderately widened posteriorly. .porcellus. 



jfl. myasellus n. sp. — Oblong, moderately stout, blackish. Antennae, legs 

 and sixth elytral interspace rufous, uniformly clothed above and beneath with 

 grayish, fine hair-like pubescence. Eostrum stout, not wider at base than apex, 

 slightly convex and strongly tricarinate, median carina prolonged and ending in 

 a frontal puncture, transversely impressed at base. Head convex, as wide be- 

 tween the eyes as rostrum at base, and, like the latter, punctured and finely 

 pube.scent. Scape of antennse gradually thickened, rather short and directed 

 against the middle of the eye; antennal grooves wide, superficial and pubescent 

 in their whole length. Thorax one-half wider than long, slightly convex, a 

 trifle wider at base than at apex ; sides regularly rounded, apex feebly constricted 

 and transversely impressed; lobes feeble; there is a slight emargination in the 

 middle of the anterior thoracic margin ; surface con fluently rugulose-punctate, 

 pubescent, sparsely covered at the sides with pale scales and some scattered scales 

 on the disc. Elytra about one-fourth wider than thorax at middle; emarginate 

 at base, humeri rounded, very slightly narrowed for about three-fourths their 

 length, thence gradually narrowed to and rounded at apex. Striae impressed, 

 punctures moderate, approximate ; interstices wide, flattened, alternate ones 

 with rows of distant, setigerous punctures, seta? very slender, moderately long, 

 inconspicuous, sixth interspa e from near the base to the posterior callus rufous; 

 surface finely pubescent; scutellum, base of sixth interspace and a few scattered 



