COLEOPTEKA. 157 



strongly arcuate; disk very convex, more so than in splnvricolliK, polished, 

 impunctate. Elytra at base slightly wider than the pronotuni ; sides feebly 

 divergent posteriorly, feebly sinuate near the humeri, arcuate toward the 

 apices, distinctly shorter than the width at base ; broadly and extremely 

 feebly emarginate behind, edges very slightly divergent at the inner apical 

 angles ; sutui'e and scutellum together distinctly longer than the pronotum : 

 disk depressed, polished, impunctate except a row of very feeble distant 

 punctures near the exterior edge ; color paler along the base and apices. 

 Scutellum broader than long, rather small, rugulose, angulate behind. 

 First abdominal segment nearly as wide as the contiguous elytra ; sides 

 divergent and very feebly arcuate to the fifth segment which is the widest, 

 and one-fourth wider than the first ; border extremely strong, erect, almost 

 reflexed, abruptly nearly obsolete on the sixth ; surface depressed, polished, 

 minutely reticulate, impunctate. Legs rather long ; tarsi slender, third 

 joint of the posterior slightly less than twice as long as the first two together, 

 first slightly shorter than the second ; claws long, feebly arcuate, appendi- 

 culate. 



■ Male. — General sexual characters similar to those of the preceding species, 

 the emargination of the sixth segment is, however, much broader, less strong 

 and more transverse at the bottom. 



Female. — Unknown. 



Length 3.0 mm. 



F'ort Gai'laiid, Colorado (Schwarz). 



ICasily recognized by its very spherical protliorax, thick dark 

 antennae, and strong abdominal border. 



The first joint in one of the posterior tarsi exhibits signs of a trans- 

 verse lobation, and gives a distinct impression of a 4-jointed tarsus, 

 althougli this appearance is generally not at all observable. 



4. A. gracilicornis n. sp. — Form rather slender. Pubescence very 

 sparse, setiform, very long and coarse, erect, testaceous. Color of head and 

 protliorax dark reddish-testaceous ; the same color extends to the base of 

 the elytra and along the suture, remainder of the elytra piceous ; abdomen 

 piceous-black, slightly paler and more pubescent beneath; metasternum 

 dark piceous. remainder of the under surface pale rufo-testaceous ; legs 

 testaceous, femora much darker in the distal half; antennae testaceous 

 toward the base, brownish-fuscous toward tip, last joint not paler. Head 

 moderate ; eyes very small, not prominent ; sides behind them feebly con- 

 vergent, broadly rounded at the posterior angles ; transverse behind ; inter- 

 ocular surface smooth, impunctate, polished, having a deeply impressed 

 foveate piincture near the point of origin of each supra-antennal tubercula- 

 tion ; the latter rather strong but short ; just in front of this puncture there 

 is another very small one ; epistoma broadly rounded, sides nearly parallel ; 

 antennae very long, as long as the elytra, pronotum and one-half the head 

 together, rather slender, basal joint much elongated, all the joints much 

 longer than wide, incrassate toward tip, second joint much shorter than the 

 third. Prothorax just perceptibly narrower than the head across the eyes, 

 Cont. Part II. 7 January, 1885. 



