EEVISION OF ELEODIINI BLAISDELL. 163 



Siiperiov pudendal membrane obsoletely rugulose and reaching 

 about to the middle of the dorsal plate. 



Ventrolateral surfaces. — Body 'of the segment quite strongly con- 

 vex, broadly and quite deeply concave beneath the apex, the con- 

 cavity continuous with the submarginal groove, the latter broad and 

 shallow from the base beneath the explanate external border of the 

 dorsal plate: surface coarsely punctate and setose, seta' rather short. 

 Genital fissure rather narrowly fusiform, the internal margins of the 

 valves being contiguous in basal and apical fourths. Inferior puden- 

 dal membrane apparently closing the fissure. 



Habitat. — Arizona (region of the (xila River, LeConte and Horn; 

 P^ort Grant; Oracle in April, Hubbard and Schwarz; Prescott, col- 

 lection Charles Fuchs; Nogales, September 22, Albert Koebele and 

 F. W. Nunenmacher). 



Number of specimens studied, 20. 



Type in the LeConte collection. 



Type-locality. — '' Flumen Gila," Arizona (LeConte). 



/Salient type-characters. — Narrowed anteriorly, generally opaque. 

 Thorax scarcely conspicuously narrowed anteriorly, sides usually 

 straight, finely and sparsely punctate. Elytra finely, distinctly, and 

 seriately punctate (LeConte). 



Diagnostic characters. — Similar to yoryi in general outline, but less 

 robust and less inflated, and more fusiform than either the above or 

 insularis. The surface is opaque and the elytra sculptured with strise 

 of fine punctures. The latter- are in contrast to the more or less 

 coarse punctures of goryi. 



The males have only the basal joint of the anterior tarsi pubescent 

 beneath, which distinguishes it from all othei" members of the sub- 

 genus, except insulates. 



The prothorax appears widest at the base when viewed vertically 

 from above, with the sides converging to apex (forma typica) ; but 

 these characters depend upon the sides being normally arcuately de- 

 flexed, otherwise it would appear more or less widest at the middle. 

 The base is always relatively wider, as compared to the apex, than in 

 insularis. 



Two males from Prescott, Arizona, have the pronotum widest at 

 the middle, and the sides are feebly sinuate before the basal angles, 

 the base appearing narrower- than normal (forma sinuata). Their 

 large size and dull integuments serve to separate them from insularis. 

 Such variations are to be expected; some females exhibit this tend- 

 ency, the sides of the pronotum becoming more strongly arcuate. 



The mentum is variable in form as in insularis. The surface is 

 more or less distinctly excavated laterally and as a result the middle 

 is more or less longitudinally ridged. 



