NORTH OF MEXICO. 



289 



impressions along the basal margin of the thorax. The median impression is rather deep 

 and rounded on each side by an elevation. The margin of thorax is slightly turned up- 

 ward, more distinctly so near the anterior angles. The base of elytra is truncate and 

 the angles distinct, not prominent. 



Collected by Mr. Gabb in the peninsula of Lower California. 



A. elata, (Pelecyph.) Leo., Proo. Acad. 6, 445; (Philolithus) Lao. Geneva V., p. 158; Peleoyph. difformis, 

 Loo., Proo. Acad. 7, 728; (Philolithus) Lac, loo. oit.; Thomson, Arcana 1, pi. XII, fig. 7. 



This species is remarkable in the curious form of its thorax. Sides of thorax strongly 

 angulatc and margined, margin broadest at the angulation, rapidly narrowing to the an- 

 terior angles, which are dentiform ; behind the angulation the margin is very feeble and 

 the sides are rather feebly sinuate to the hind angles; apex of thorax feebly emarginate, 

 base nearly truncate, with angles rectangular. The margin of the thorax is in some specimens 

 rather strongly reflexed, so that the disc becomes concave. The disc is nearly smooth, 

 the margin very strongly and densely punctured. The elytra, are elongate oval, nearly 

 twice as long as broad, not acutely margined, feebly convex and with shallow longitudinal 

 grooves. Along the suture the elytra are reddish brown, recalling the color seen in many 

 Elcodcs. 



This species is distributed from Oregon to Texas. 



Length 1.00-1.25 inch. 



SUB-TRIBE II — ASTROTI. 



The two genera constituting this sub-tribe have been separated from the other genera 

 of Asidini on account of the form of the middle coxax In the species of the preceding 

 sub-tribe, the middle coxee are strongly angulate, externally closed by the parapleural and 

 allowing the trochantin to become very distinctly visible. In these genera, on the con- 

 trary, the coxal cavities are nearly rounded, closed by the sterna, and the trochantin if at 

 all visible is very minute. The buccal cavity is also more completely closed by the men- 

 turn, against which the sides of the gula fit accurately, not allowing the maxilla; to be- 

 come visible. The ligula is completely hidden. Two genera constitute this sub-tribe, as 

 follows : 



Antenna) slender, joints longer than broad, apex of prosternum deficxed; 



trochantin very small. ologlyptus. 



Antenna; with joints broader than long, apex of prosternum prominent; 



trochantin not visible. astrotus. 



OLOGLYPTUS, Lac. 

 Ologlyptus, Lacordaire, Geneva V., p. 158. 

 Pactostomn, Leo., Journ. Acad. N. S. IV., p. 19. 



(Without any other characters than those given in a tabic 1 .) 



AMERI. 1'IIILOSO. SOC. — VOL. XIV 73 



