242 MEMOIRS ON THE COLEOPTERA 



apex similarly upturned, broad and biobliquely sinuate; antennal 

 club not quite so large but similarly pubescent; prothorax about 

 two-fifths wider than long, the oblique sides apically not or scarcely 

 sinuate, the bottoms of the divided cavity and the external surface 

 about the base of the short, very broad posterior processes, coarsely 

 undulato-rugose; the elevated longitudinal ridge, which completely 

 divides the cavity, is smooth but becomes more or less rugose on its 

 posterior part in the moderately developed males, where the extent 

 of thoracic rugulosity is more extended; in the least developed males 

 all trace of this ridge is lost, the strongly rugose cavity being virtually 

 as in the female, though with the apical horn distinctly longer; 

 posterior processes about half the length of the arcuate apical horn; 

 basal areas of rugosity rather large in all classes; scutellum very 

 strongly rugose except broadly toward the sides and toward apex; 

 elytra barely to distinctly longer than wide, about as wide as the 

 prothorax slightly wider in the less developed males but much to 

 slightly less than twice as long, rounded in about posterior half, 

 smooth, with a few fine and feebly impressed lines and some feeble 

 but distinct, rather coarse punctuation, especially laterad; pygidium 

 nearly as in the preceding; metasternum variable in extent of punc- 

 tuation. Female slightly narrower than the male, the prothorax 

 smaller though less transverse and more distinctly narrower than the 

 elytra, the cephalic tubercles generally more approximate as in the 

 least developed males, the clypeal apex, however, is more narrowly 

 truncate than in any male, and the rugulosity of the clypeus is 

 stronger than in that sex. Length (lief, io9) 34.0-47.0 mm.; 

 width 18.0-24.5 mm. Mississippi (Vicksburg) to western Texas (El 

 Paso) and southward to Central America. Abundant, the fully 



developed male rare julianus Burm. 



6 Outline rather narrower, blackish, the prothorax nubilously rufescent 

 at the sides, the elytra dark castaneous, the under surface bright 

 rufous, shining; head rather small, about a third as wide as the pro- 

 thorax, the rugosity strong and coarse, less strong and more trans- 

 versely wavy on the clypeus, the minute intermingled punctulation 

 obsolescent, the gradually strongly upturned apex broadly, bi- 

 obliquely sinuate, the larger mandibular tooth rounded; antennal 

 club very moderate; prothorax shorter than in julianus, three- 

 sevenths wider than long, the oblique sides apically not only not 

 sinuate, but scarcely straight, being just visibly arcuate; sculpture 

 and cavity throughout as in julianus, except that for the same 

 stage of development the longitudinal ridge is more obsolete, being 

 very feeble, rather vague and as densely sculptured as the rest of 

 the surface; in the type, the erect apical horn has its apex rather 

 acute and not binodulose; scutellum with the usual very coarse 

 anterior rugosity; elytra fully a sixth longer than wide, slightly wider 

 than the prothorax and about twice as long, rounded in posterior 

 half, the surface very smooth, without even a trace of fine impressed 

 lines, the sutural stria distinct but not so coarse or deep as usual; 

 pygidium as usual, the basal punctuation and pubescence rather 

 dense, extending almost to the basal margin; posterior coxal plate 



