A REVISION OF NORTH AMERICAN CHRYSOBOTHRI1NI 35 



lose. Each elytron with two more or less distinct longitudinal costae on 

 apical half, and with two vague foveae, one just in front of middle, the other 

 at apical third. 



Abdomen beneath sparsely, finely punctate, rather densely clothed with mod- 

 erately long, recumbent, white hairs, the hairs denser toward sides, with smooth, 

 lateral callosities, the intervals indistinctly granulose; last visible sternite 

 broadly subtruncate at apex, the lateral margins distinctly serrate; eighth 

 tergite rounded at apex, coarsely punctate, but not longitudinally carmate. 

 Presternum coarsely, sparsely punctate, sparsely clothed with long, semierect, 

 white hairs; anterior margin with a broad, very short, median lobe. Anterior 

 femur with a long, acute tooth, which is strongly dentate on outer margin. 

 Anterior tibia slightly arcuate, unarmed at apex; middle and posterior tibiae 

 straight. 



Length 7.5 mm., width 2.75 mm. 



Kedescribed from the female lectotype, No. 3441, in the Academy 

 of Natural Sciences of Philadelphia. 



Male. — Differing from the female in having the head bronzy green in front, 

 becoming reddish cupreous on the occiput, the antenna purplish brown, the last 

 visible sternite broadly, arcuately emarginate at apex, the eighth tergite sub- 

 truncate or vaguely emarginate at apex, the presternum coarsely, densely 

 punctured posteriorly, but more finely punctured along anterior margin, and the 

 anterior and middle tibiae more strongly arcuate, the former gradually expanded 

 and armed with a vague dilation near apex. 



Type locality. — Texas, no definite locality. Lectotype designated 

 by Chamberlin (1926). 



DISTRIBUTION 



From material examined: 



Arizona: No definite locality. Type series (H. K. Morrison). Palmerlee, May 

 25 (Biedermann). Catalina Springs, April-May (Hubbard and Schwarz). 



Texas: No definite locality. Type series. Cotulla, March 27, 1904 (Jones and 

 Pratt) . 



The species has also been recorded in the literature from Phoenix, 

 Huachuca Mountains, and Noga'les, Ariz. Chamberlin (1926) reports 

 it from Nevada, based on a specimen in the Academy of Natural 

 Sciences of Philadelphia, but that specimen is erroneously identified 

 as Mxa, and also from Williams, Ariz., but the latter specimen is 

 arizonica Chamberlin. Horn (1894) records it from Calamajuet, 

 Lower California, but no specimens from that region have been ex- 

 amined by the writer. 



Hosts. — The larval habits are not known, but Hubbard and Schwarz 

 collected the adults in Arizona on Jatropha multifida Linnaeus. Van 

 Dyke (1937) records the species as living on coniferous trees. 



The series of specimens collected by Morrison in southern Arizona 

 show considerable variation in the shape of the body. In some ex- 

 amples the sides of the pronotum are more strongly converging pos- 

 teriorly than in others, and the sides of the elytra are parallel. In 

 most of the specimens examined the pronotum is uniformly punctured, 

 but occasionally a specimen is found with a smooth median space in 

 front of the scutellum. The median lobe on the prosternum is so 

 small on some examples that this species can hardly be classified with 

 the species having the prosternum lobed. In a specimen from Catalina 

 Springs, Ariz., the clypeus is slightly more deeply emarginate and the 

 dilation on the anterior tibia a little more prominent, but the genitalia 

 are like those of the specimens collected by Morrison. The length is 

 from 4 to 8 mm. 



