174 MEMOIRS ON THE COLEOPTERA 



and legs black: antennae slender, blackish, the two basal joints 

 testaceous; lustre rather dull, the elytra opaculate in both sexes; 

 head moderate, not over half as wide as the prothorax, the eyes 

 moderate but prominent; prothorax fully one-half wider than long, 

 the apex deeply sinuate and barely two-thirds as wide as the base, 

 the sides very evenly and moderately arcuate and converging 

 throughout, the edges rather finely and abruptly reflexed; base 

 transverse medially, very feebly posteriorly oblique laterally, the 

 angles right, narrowly rounded; surface impunctate, moderately 

 declivous at the sides throughout, the foveae sublinear but very 

 broadly, feebly impressed and vague; elytra subequal in width to the 

 prothorax, not quite one-half longer than wide, gradually rounding 

 at the sides and ogival posteriorly, the sinus feeble but evident; 

 surface not evidently punctulate at the sides and tip, the striae 

 rather fine, abrupt, the scutellar long, the intervals nearly flat; 

 hind tarsi very slender, the basal joint as long as the next three 

 combined. Length (cf 9 ) 9.0-10.5 mm. ; width 3.8-4.5 mm. Rhode 

 Island to Arizona. Very abundant. [Anisodactylns tristis Dei.]. 



rusticus Say 



A Similar to rusticus in general form but larger, the humeri similarly 

 without denticulation at base; head slightly larger; prothorax not 

 quite so transverse, otherwise similar, but with the anterior 

 angles rather more advanced and a little more acute and the 

 punctiform impression at the anterior end of the basal foveae is 

 more pronounced; elytra rather more dilated toward base, more 

 deeply striate and with more convex intervals, the posterioi 

 seriate punctures distinct. Length (9) 12.5 mm. Locality 

 uncertain, probably either from Carolina or Missouri. 



haplomus Chd. 



Form somewhat similar but larger and very much broader, still more 

 opaque throughout above; antennae (9 ) still more slender and evi- 

 dently longer; prothorax broader, nearly twice as wide as long, the 

 apex still narrower and more deeply sinuate, about three-fifths 

 as wide as the base, otherwise very nearly as in rusticus throughout; 

 elytra similar but broader, only about two-fifths longer than wide, 

 the humeri minutely but acutely denticulate laterally at base; legs 

 a little longer but otherwise similar. Length (cf) 13.5-13.8 mm.; 

 width 5.4-5.6 mm. North Carolina (Southern Pines), Manee; 

 XewYork LeConte. [A. (Triplectnis) gravidus Lee.]. . crassus Lee. 

 Form stout, nearly as in crassus but with the pronotum transversely and 

 feebly rugose and the subdepressed margins posteriorly increasing 

 in width obsoletely but rugosely punctate, not perfectly smooth 

 and densely opaque as in the three preceding forms, the basal foveae 

 feeble but with a few sparse punctures, which are never distinct in 

 those species. Length 13.7 mm.; width 5.5 mm. Rocky Mountains. 



pinguis Lee. 



Form less stout, nearly as in rusticus but more convex, black or blackish 

 throughout, the two basal joints of the antennae rufous; lustre 

 moderately opaque throughout as in rusticus; head distinctly larger 

 and with larger and more conspicuous eyes, fully three-fifths as 



