34 PROCEEDINGS OF THE NATIONAL MUSEUM vol. m 



the eye as in breoifrons; a few scattered coarse punctures behind the 

 carina, the smooth areas finely alutaceous. 



Pronotum quite convex, tumid anteriorly, but considerably less 

 so than in the male major; the tumosity more rounded but still similar 

 to that of the male, and the lateral concavities much reduced, extend- 

 ing neither to the lateral margins nor to the anterior angles; margin 

 onl}^ slightly bent in the anterior third ; punctures slight!}^ more pro- 

 nounced than in the male, but still smaller and more scattered than in 

 brevifrons; midlme of pronotum slightly depressed posteriorly and 

 with fewer coarse punctures. Elytra not noticeably different from 

 those of the male. Pygidium rather convex apically and more shining 

 than in the male but otherwise similar. Ventrally, differences from 

 the male are noted in the shorter and wider foretibia and in the last 

 abdominal segment, which is not emarginate m the female. 



Variation. — ^In the males the length varies from 9.5 to 11 mm., the 

 width from 5.7 to 6.4 mm., and in the females the length varies from 

 9.1 to 11.2 and the width from 5.4 to 6 mm. The 10 specimens seen 

 exhibit remarkably few noteworthy differences. The brightness of 

 the greenish color of the pronotum is slightly more pronounced in 

 some of the specimens, but in all it is quite evident. In the smaller 

 specimens, both male and female, the pronotal punctures are slightly 

 more pronounced than in larger specimens of the same sex. The 

 male paratypes have the carina of the vertex more sharply indicated 

 laterally than in the holotype, but otherwise the carinae are similar. 



Type.— USNM 65683. 



Type locality. — Waglers Cave, Harrison, Ark. 



Specimens examined. — 10. 



Distribution. — (See fig. 4, p. 29.) Holotype, cf, and allotype, 9, 

 Harrison, Waglers Cave, Ark., Apr. 13, 1935, in bat dung, J. M. 

 Valentine. And the following paratypes: 



Arkansas: Washington Co., Apr. 24, 1938 (inhs). Oklahoma: 1 ?, Tahle- 

 quah, Adair Co., Sept. 26, 1954, O. C. Schomberg (ljb). Texas: Vicinity "cave 

 without name" near Boerne, Kendall Co., July 30, 1948, G. E. Ball (amnh) ; no 

 locality (mcz); 1 ? (ansp). Missouri: 4 cfcf, 2? ?, Bat Cave, Liking, June 

 20, 1956, Conde (Museum National d'Histoire Naturelle, cnc). 



Remarks. — Onthoijhagus cavernicollis can be distinguished from 

 other North American species by its large size and bright, shming 

 green pronotum. Except for size and color, the characteristics listed 

 for separating 0. brevifrons will also separate this species from the other 

 North American forms. Coloration, size, the smaller pronotal 

 punctures, and the shape of the carina on the vertex of the female 

 ^vill separate cavernicollis from either bremfrons or subtropicus. 



In addition to the characteristics given above, the habitat in which 

 the majority of specimens have been taken seems to set the species 



