326 MEMOIRS ON THE COLEOPTERA 



Am. Phil. Soc., 1880, p. 404). I am unable to confirm the language 

 of LeConte, which may be due to a soiled elytral surface, though 

 this would seem to be improbable. The species resembles fulgida 

 in size and outline and could be placed near that species almost as 

 well as here, though not closely allied to fulgida and peculiar in the 

 tubercle of the thoracic apex; the antennal club in the male is 

 barely as long as the stem, slightly shorter in the female. 



Group VII. 

 Subgenus Isorhipina nov. 



The chief peculiarity of this group is the attenuated flat clypeus, 

 having its apex more or less strongly bilobed, but it, like the pre- 

 ceding group, includes strongly pubescent to nearly glabrous species, 

 also those having strong to subobsolete elytral costae and, though 

 the elytra generally have tomentose spots and lines, there are some 

 forms, such as dimidiata and devulsa, which have no trace of them, 

 showing that none of these characters, taken alone, can be con- 

 sidered as of subgeneric significance. The antennal club is small 

 and sexually subequal in all and the general scheme of ornamenta- 

 tion is also peculiar to the group. The anterior tibiae are tridentate 

 in both sexes. The rather numerous species are almost wholly 

 Mexican and Central American and those at hand, excepting 

 devulsa, the description of which is taken from the original, may 

 be known as follows: 



Upper surface with conspicuous pubescence; body narrow and elongate. 2 

 Upper surface glabrous or nearly so; body varying in form but always 

 having the elytral costae very feeble, sometimes almost obsolete. .4 

 2 Elytra in great part opaque and velvety, the costae extremely feeble, 

 almost obsolete. Black, the head, prothorax, broad sides of the 

 elytra and elevated suture, pygidium, under surface and legs shining; 

 flanks of the elytra and a small area near the suture before the middle 

 dark rufous; pubescence long and coarse, glistening, pale fulvous, 

 close on the pronotum, sparse and bristling on the elytra, except on 

 the costal surfaces, sparse beneath, denser at the sides; head rather 

 finely, very closely punctate; clypeus longer than wide, parabolic, 

 not reflexed or very narrow at apex but distinctly bilobed, hairy 

 throughout; prothorax slightly transverse, trapezoidal, the sides 

 subparallel in basal half, the punctures fine, dense and forming oblique 

 series laterally, stronger and less confluent medially, the impunctate 

 line scarcely tumid, only visible in basal half, the basal margin 

 broadly smooth medially, more narrowly toward the sides; lateral 

 bead thin and acute, without inner tomentum; scutellum with scat- 



