BEETLE GENUS ONTHOPHAGUS — HOWDEN, CARTWRIGHT 65 



alutaceous, but in monticolus is dull. The largely alutaceous, very 

 feebly convex pygidium will separate monticolus from alluvius or knulli. 

 The adult habits of monticolus appear to be nearly identical with 

 those of alluvius and knulli. All the specimens were taken at eleva- 

 tions over 5000 ft. in mixed deciduous-pine forests. Specimens were 

 taken on cow and horse dung and in human feces. On the Chipinque 

 Mesa near Monterrey, monticolus and alluvius were taken together 

 in the same pile of dung, this being the only locality where both 

 species were found together. Normally, 0. monticolus seems to in- 

 habit high elevations with moist cool climate; alluvius is largely a 

 lowland form, surviving under hotter, dryer conditions. 



Onthophagus alluvius, new species * 



Plate 5, Figures 36 and 37 



Onthophagus anthracinus Harold, 1873, p. 104 (not Falderman, 1835, p. 247). — 

 Bates, 1887, p. 77.— Schaeffer, 1905, p. 157; 1909, p. 382; 1914, p. 298.— 

 Leng, 1920, p. 249. — Dawson, 1922, p. 179 (misdetermination for knausi — 

 fide Brown, in personal communication.). — Boucomont and Gillet, 1927, 

 p. 204.— Boucomont, 1932, p. 312.— Lindquist, 1935, p. 7. 



HoLOTYPE. — Male major, length 5.8 mm., width 3.4 mm. Wealdy 

 shining, opaque black, the elytra with a faint brownish cast. Clypeus 

 sharply reflexed ; anteriorly, very feebly, shallowly emarginate. Clypeal 

 disc and frons almost flat and lacking both clypeal and frontal carinae; 

 the frontal carina represented by a small ridge behind each eye; 

 surface very finely alutaceous with scattered fine punctures; scattered 

 coarse punctures present only laterally on clypeus. Edge of gena 

 noticeably arcuate laterally, with its anterior margin forming an 

 obtuse indentation with the clypeal margin, separated from the 

 clypeus by a fine suture; surface of gena with a few scattered coarse 

 punctures. Pronotmn moderately convex, margined anteriorly 

 and laterally; pronotal protuberance a slightly flattened cone-shaped 

 median hump, barely projecting over the posterior portion of the 

 head; pronotal surface alutaceous and rather evenly, coarsely punc- 

 tate; punctures not distinctly annular, separated by approximately 

 2 to 3 times their diameter, and bearing fine, moderately long setae 

 about half again as long as the distance between pmactures; small 

 secondary punctm'es lacking over most of disc. Elytral striae 

 shiinng, vaguely punctate; intervals opaquely alutaceous with irregular 

 double rows of small shming tubercles, the base of each tubercle 



* O. alluvius is described as a new species inasmuch as there is some doubt whether the United States 

 form is conspceiflc with the form from Guatemala (type locality of anthracinus Harold). If the two can be 

 conspeciflc, alluvius will still be the valid name of the species, the name anthracinus being preoccupied and 

 no other name being avaDable; the same statement applies If anthracinus Harold is conspecific with the 

 closely allied monticolus. It seems likely that Bates (1877, p. 77) in his description referred to monticolus 

 or a closely allied form. 



633411—62 5 



