32 PROCEEDINGS OF THE NATIONAL MUSEUM vol. it4 



and scarcely longer than the distance between them; apical segment 

 with an irregular band of coarse punctm'es separated by about a di- 

 ameter. Legs normal for females of the genus. 



Type.— USNM 65682. 



Type locality. — Laguna Madre, 25 mi. southeast of Harlingen, 

 Tex. 



Specimens examined.- — 3. 



Distribution. — (See fig. 4, p. 29.) 



Texas: Holotype, cf , Laguna Madre, 25 mi. southeast of Harlingen, Sept. 20, 

 1945, D. E. Hardy and V. L. Woolley, nest of Neotoma viicropus Baird (Robin- 

 son coll., usnm). Allotype, 9, Brownsville, Mar, 12, 1908 (Jones and Pratt 

 coll., usnm). Paratype, ?, Kingsville (C. T. Reed coll., CU). 



Remarks. — This species is very closely related to 0. hrevifrons and 

 cavernicollis and is intermediate in size. In hrevifrons, the color is all 

 black; in cavernicollis, the largest species, the pronotum is a bright, 

 shiny green; in subtropicus, the pronotum is not so shiny and is a 

 bluish or blackish dark green. The females of subtrojncus may be 

 separated from the other two species by the shape of the frontal carina, 

 which is elevated on each side to a sharp median tubercle, the tips of 

 the tubercles being nearer the middle of the carina than to the eyes. 

 In hrevifrons, this carina is wider and slopes evenly from the middle to 

 elevated romided ends which are nearer to the eyes than to the middle 

 of the carina; the carina ends on each side in a sharp vertical drop to 

 the head surface. In subtropicus, the tubercles slope evenly away 

 from their tips in both directions. In cavernicollis, the frontal carina 

 is similar to hrevifrons. The eyes of cavernicollis are larger and wider, 

 being a third as wide as long, 7 to 8 facets wide; those of subtropicus 

 are two-fifths as wide as long, 6 to 7 facets wide; those of hrevifrons 

 are sometimes no more than a fourth as wide as long and only 4 to 

 5 facets wide. In hrevifrons, there is a greater disparity in the sizes 

 of the pronotal punctures, with the coarse punctures closer together. 



The holotype may be a male minor. 



The type locality (given on the label as 25 mi. southeast of Harlin- 

 gen) was placed by a speedometer reading. Dr. Hardy informed us 

 the exact locality would be on the Lagmia Madre about 10 miles north- 

 west of Port Isobel in an area used by Harlingen Air Force Base for 

 its gunnery school. 



Onthophagus cavernicollis, new species 



Plate 3, Figures 22 and 23 

 0. hrevifrons Horn, 1881, p. 76, in part. 



Holotype. — Male major, length 11 mm., width 6.4 mm. Head 

 and pronotum shining, bright green; elytra wealdy shining, black; 



