17" AMERICAN COLEOPTEBA. 



Second joint of tarsi but little shorter than the first ; first ventral segment with 

 a fine impressed line running obliquely hackward from the inner mar- 

 gin of each coxa; front tibise and tarsi not toothed in the % . 



transversal is. 



Second joint of tarsi distinctly (usually much) shorter than the first; first ven- 

 tral without impressed lines; front tibiae of % with a small acute 

 tooth on inner side beyond the middle . . -Subgenus < 'orl i<a ii nil . 

 I'rothorax of variable width, hut always distinctly more than half as wide 

 as the elytra; subbasal impression more or less transverse, usually 

 confined to the disk, though at times more or less vaguely produced 

 laterally; metasternal episterna im punctate or nearly so [except in 



similata and possibly regularis) 1. 



Prothorax scarcely more than half as wide as the elytra, and with a moder- 

 ately deep subbasal transverse impression extending nearly from side 

 to side; metasternal episterna punctate. 



Color brown ; pubescence shorter, appressed ; sides of thorax feebly 

 rounded and scarcely serrulate gibbosa. 



Color testaceous ; pubescence long and bristling; sides of thorax rounded 

 and rather strongly serrulate iiicompf :i , 



1. Prothorax less transverse and less rounded on the sides, base narrower than 



the base of the elytra, the humeri rather broadly exposed (see PI. 

 V, fig. 68). 

 Elytra regularly subovate, their apices scarcely or feebly truncate. 

 Size smaller — nevermore than 1.5 mm., usually about 1.25 mm. — prothorax 



but little more than half as wide as the elytra similata. 



Size larger— always exceeding 1.5 mm. 



Prothorax but little more than half as wide as the elytra; the subbasal 

 fovea feeble and produced laterally: second joint of hind tarsi a little 



shorter than the first regularis. 



Prothorax wider; subbasal fovea deeper, but not distinctly produced 

 laterally; second joint of hind tarsi much shorter than the first. 



terricula. 

 Elytra arcuate at the sides anteriorly, thence convergent and nearly straight 

 almost to the apices, which are more evidently truncate. . -alberta. 

 Prothorax more transverse and more strongly rounded at sides, base nearly as 

 wide as the contiguous base of the elytra, the humeri but little ex- 

 posed (see. PI. V, figs. 69, etc). 

 Side.s of elytra nearly straight posteriorly, their apices distinctly truncate; 

 color pale testaceous; last two ventral segments in the 9 obliquely 

 ascending, their sutures more or less evidently arcuate. 



longipennis. 



Sides of elytra arcuate throughout, their apices feebly or scarcely truncate; 

 ventral segments of <p on same plane, sutures straight 2. 



2. Tempora very short ; outer joints of antenna! funicle longer than wide, the sixth 



and seventh very distinctly so. the eighth occasionally subglobular. 

 Elytra less broadly ovate, widest at I be middle, relatively longer and more 

 obtuse at apex : size generally larger, color usually yellowish to reddish 

 testaceous a meriea na. 



