52 GEO. H. HORN, M. D. 



Male. —Anterior tibial spur long, arcuate, not more slender to tip, extending 

 beyond the apical tooth and the second tarsal joint. 



Female. — Anterior tibial spur more slender to tip, less arcuate, and shorter than 

 in the male. Thorax more distinctly punctured at middle. 



This species although shining seems to connect the })resent serie.s 

 with the lutulentus group by its general form and the very flat ely- 

 tral intervals. The angles of the clypeus are less broadly rounded 

 than in the adjacent species, although not angulate as in bicolor, etc. 

 The reddish brown space at the apices of the elytra is always present, 

 although it varies not only in size, but also in distinctness. 

 Occurs from the Middle States to Kansas and Texas. 



A. cruontatus Lee. — Oblong oval, moderately convex, piceous or black ; 

 elytra dull red, nearly as in fimetarius, varying to piceous, legs dark brown to 

 black. Antennse brownish, club piceous. Head moderately convex, front indis- 

 tinctly trituberculate, surface moderately coarsely not closely punctured. Cly- 

 peus hemihexagonal, broadly feebly emarginate in front, the angles very obtuse, 

 sides feebly arcuate, gense moderately prominent, but obtuse. Thorax twice as 

 wide as long, less obviously so in the female, slightly narrower in ^ront, the sides 

 feebly arcuate from base to apex, hind angles distinct, but rounded ; base i"egu- 

 larly arcuate, the marginal line tine, but entire; disc modei-ately convex, the 

 punctuation not dense, intermixed, a little closer at the sides. Elytra a little 

 wider than the thorax, humeri distinct, but obtuse ; strise moderately deep, rela- 

 tively finely punctate, intervals slightly convex, indistinctly biseriately punctu- 

 late. Mesosternum opaque and alutaceous, smoother at middle. Metasternum 

 opaque and alutaceous, smoother at middle. Metasternum sparsely punctate at 

 the sides. Abdomen indistinctly punctate. Anterior tibiae smooth in front, tri- 

 dentate externally, indistinctly crenate above, first tarsal joint shorter than the 

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

 long as the next three. I^ength .22-. 30 inch ; 5.5-7.5 mm. 



Male. — Frontal tubercles rather more distinct. Thorax broader, more convex, 

 at middle less punctate. Anterior tibial spur stout and moderately curved. 



Female. — Frontal tubercles feeble. Thorax narrower, less convex and more 

 punctate. Anterior tibial spur slender, less arcuate. 



This species was described by Dr. LeConte from a single si)ecimen, 

 and some of the characters given by him are purely individual. The 

 series before me consists of twenty specimens selected from a large 

 number collected by Mr. A. S. Fuller, in New Mexico, and by 

 Morrison in Arizona. Two varieties may be indicated — those with 

 dull red elytra and those entirely black, with, however, all the inter- 

 mediates in color without any differences of form or sculpture. I am 

 informed by Mr. H. W. Bates that the black forms from Arizona 

 have been distributed by Morrison as ursinus, which they resemble in 

 a general way, but differ especially in the unequal spinules of the 

 tibite. The forms with red elytra resemble ritbripennis, which, how- 

 ever, differs in many ways. 



Occurs in Arizona and New Mexico. 



