62 GEO. H. HORN, M. D. 



finely punctate at middle, more coarsely and densely at the sides. Clyjjeus 

 broadly feebly emarginate, at middle a small, acute, reflexed tootli each side ; 

 sides strongly arcuate, genfe prominent, but obtuse. Thorax nearly twice as 

 wide as long, distinctly narrower posteriorly ; sides arcuate, hind angles distinct, 

 but obtuse ; base arcuate at middle, oblique near the hind angles, the marginal 

 line distinct, disc moderately convex, coarsely sparsely punctate with finer punc- 

 tures intermixed and more closely punctured near the sides. Elytra as wide at 

 base as the thorax, wider posteriorly, humeri dentiform, striae deep and subcren- 

 ately striate, the intervals slightly convex, very sparsely finely punctulate. Me- 

 sosternum coarsely and densely punctate, obtusely carinate between the coxae. 

 Metasternum at sides and abdomen sparsely punctate. Anterior tibiae smooth in 

 front, tridentate externally, the teeth rather small and in the apical third of the 

 tibia, above creuate, first tarsal joint as long as the second. Posterior femora 

 sparsely punctate, the first tarsal joint longer than the three following. Length 

 .28-.36 inch ; 7-9 mm. 



Mule. — Anterior tibial spur short, truncate and slightly emarginate at apex, 

 the inner angle slightly prolonged. Upper sjiur of middle tibia short, slightly 

 curved. 



Female. — Anterior tibial spur acute. 



As may be observed in many species, the thorax of the female lias 

 more numerous punctures. 



This is one of the largest of our native species, and is easily known 

 by the thorax narrower behind, the form of clypeus, the feebly cari- 

 nate mesosternum and the unequal spinules of the hind tibia. 



Occurs from Pennsylvania to Colorado. A specimen in the cabi- 

 net of Amer. Ent. Soc. is marked Arizona. 



\. sparsus Lee— Elongate, moderately convex, slightly wider posteriorly, 

 piceous black, shining ; legs reddish brown. Antennae pale. Head moderately 

 convex, front not tuberculate, sparsely punctulate at middle, a few coarser punc- 

 tures near the side. Clypeus broadly, but feebly emarginate, the angles broadly 

 rounded, sides arcuate, gense moderately prominent, subacute. Thorax twice as 

 wide as long, distinctly narrower posteriorly, sides arcuate, hind angles obtuse, 

 base arcuate, on each side near the angles sinuate, the marginal line entire and 

 deep, disc moderately convex with numerous very coarse punctures irregularly 

 scattered, more closely placed near the base and sides with much finer punctures 

 intermixed. Elytra narrower at base than the thorax, somewhat broader poste- 

 riorly, humeri dentiform, the striae moderately deep and coarsely punctured, 

 intervals slightly convex, with few indistinct fine jiunctures. Mesosternum 

 coarsely punctate, feebly shining, distinctly carinate between the coxae. Metas- 

 ternum sparsely finely punctate at sides, abdomen with scarcely a trace of punc- 

 tures, alutaceous and slightly rugose. Anterior tibiae smooth in front, tridentate 

 extei-nally and not crenate above, the first tarsal joint a little longer than the 

 second. Posterior femora sparsely punctate, the first tarsal joint as long as the 

 next three. Length .26 inch ; 6.5 mm. 



The only specimen before me is a female, probably ; the spur of 

 the anterior tibia is slender and acute. 



