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PROCEEDINGS OF THE NATIONAL MUSEUM ^ol. ii4 



Figure 8. Distribution of species of Onthophagus: 



knulli, new species 

 ▼ alluvius, new species 

 ^ vionticolus, new species 



O subaeneus (Palisot de Beauvols) 

 ■^ aciculatulus Blatchley 



Secondary punctures likewise are occasionally relatively scarce, but 

 this apparent scarcity may be due to abrasion. 



Only specimens from the Chisos Mountains of Texas and from the 

 eastern escarpment of the Sierra Madre Oriental in Mexico are in- 

 cluded under this species at present. We have examined a Champion 

 specimen, a female, collected at 7800 ft. at Quezaltenango, Guate- 

 mala; though very close to 0. monticolus, the specimen shows some 

 slight differences in the pronotal punctures and the pygidium is quite 

 convex. This Guatemalan form is almost certainly the one called 

 0. anthracinus Harold by Bates (1887, p. 77). Even if conspecific 

 with monticolus (assuming it is the anthracinus of Harold and not 

 referable to alluvius), the name monticolus will be valid. However, 

 it appears likely that the two forms are not conspecific. More ma- 

 terial is needed before the matter can be settled. 



0. monticolus can be distinguished by its black color, its well- 

 separated, distinctly margined, often annular setigerous prontal punc- 

 tures, small nonsetigerous secondary punctures, pronotal surface dull 

 and alutaceous between punctures, median pronotal protuberance 

 always at least vaguely indicated, and by its tuberculate alutaceous 

 elytra. The pronotal punctures, though quite similar to those of 0. 

 knausi Brown, are separated by more than 1 diameter; the pronotal 

 surface between the punctures in knausi is shining and only minutely 



