A REVISION OF NORTH AMERICAN CHRYSOBOTHRINI 197 



apex, the angles prominent and bidentate, and the lateral margins not serrate, 

 but interrupted at apical thirds ; eighth tergite coarsely, densely punctate, broadly 

 rounded at apex. Prosternum gibbose on each side along anterior margin, smooth 

 at middle, coarsely, irregularly punctate, somewhat rugose, and densely clothed 

 with long, erect, white hairs at sides ; anterior margin slightly arcuate, but with- 

 out a median lobe. Anterior femur with a large, acute-angulated tooth, which is 

 not dentate on outer margin. Anterior tibia slightly arcuate, with a small, 

 triangular tooth at apical fourth, distinctly notched behind tooth; middle and 

 posterior tibiae with a number of small teeth on inner margins. 



Length 18 mm., width 7 mm. 



Female. — Differing from the male in having the front of the head more coarsely 

 punctate, and with numerous small, irregular, smooth callosities, the last visible 

 sternite broadly, shallowly, arcuately emarginate at apex (the emargination sin- 

 uate at bottom), and with the smooth median carina longer, the eighth tergite 

 confluently punctate, and the anterior and middle tibiae nearly straight, and all 

 of the tibiae unarmed. 



Redescribed from a male topotype (No. 1) from Arizona, in the 

 Academy of Natural Sciences of Philadelphia. 



Type locality. — Northern Sonora, Mexico (by present designa- 

 tion). Lectotype in the British Museum. 



DISTRIBUTION 



From material examined: 



Arizona: No definite locality (H. K. Morrison). Oracle, July 4, reared 

 (Hubbard and Schwarz). Sabino Basin, Santa Catalina Mountains, Sep- 

 tember (C. H. T. Townsend). Santa Catalina Mountains and Redington, 

 reared (M. Chrisman). Miller's Canyon, Huachuca Mountains, April- July 

 (Brooklyn Mus. coll.). Palmer lee, May 25 (Biedermann). Carr Canyon, 

 Huachuca Mountains, Cochise County, August 1905 (H. Skinner). 



Mexico: No definite locality. 



Waterhouse (1887, 1889) records it from Amula in Guerrero, 

 Oaxaca, and Orizaba, Mexico, and Chamberlin (1926) from Nogales, 

 Ariz. 



Hosts. — This species has been cut from Emory oak {Quercus 

 emoryi Torrey) in Arizona by Hubbard and Schwarz, and has been 

 reared by Kirk from white oak (Quercus arizonica Sargent) collected 

 at Redington and in the Santa Catalina Mountains, Ariz., by M. 

 Chrisman. Chamberlin (1926) records it from greasewood, but this 

 record was taken from an erroneously labeled specimen in the United 

 States National Museum, and the original notes under the number 

 on the specimen state that it was reared from white oak. 



The sculpture and coloration are rather constant in the specimens 

 examined, except on the head, where the sculpture and pubescence 

 are slightly variable. The smooth callosities on the pronotum are 

 more numerous in some specimens than in others, and frequently the 

 lateral callosities on the abdominal sternites are replaced by numerous 

 small, irregular, smooth spaces. The length is from 14 to 22 mm. 



Horn (1886) figured and gave a redescription of what he thought 

 was aerea described by Chevrolat, and stated : 



My first specimen was given me by Dr. C. A. Dohrn, of Stettin, since which 

 others have been collected by Morrison in Arizona. On comparison with the 

 Saunders collection now in the British Museum it bore the name costifrons 

 Chevr. 



Horn, being somewhat in doubt regarding the status of costifrons, 

 communicated with his friend Salle, who sent him a specimen of 

 Chrysobothris aerea Chevr. (mexicana Dej.) with the following re- 



