26 PROCEEDINGS OF THE NATIONAL MUSEUM vol. i04 



sutural and median elytral vittae, sometimes a trace of a submarginal 

 vitta near apex; legs pale, a dark streak on femora and tibiae, broader 

 at apex on hind femora; antennae unusually long. 



Head with interocular space a little more than half width of head, 

 the carina broad and rounded, lower front short, tubercles distinctly 

 marked, a cluster of punctures on either side near eye, the color pale, 

 with a dark mark at extreme base of occiput on either side, often fading 

 into reddish brown behind the eyes, mouthparts deeper in color. 

 Antennae unusually long and slender, extending to the middle of the 

 elytra, dark with the basal joints pale edged. Pro thorax about twice 

 as wide as long, moderately convex, with a slight depression over 

 scutellum, the sides rounded; pale yellow with two small dark spots 

 anteriorly, surface shiny, almost impunctate. Scutellum pale or 

 edged with dark. Elytra not as shiny as prothorax, faintly alutaceous, 

 almost impunctate, pale yellow with very narrow sutiu*al and median 

 dark vittae, often only the sutural edges darkened, and this not to 

 base, sometimes at apex a trace of a submarginal dark vitta. Epi- 

 pleura pale. Body beneath usually pale but in certain Mexican 

 specimens a deepening in color on some abdominal segments, femora 

 and tibiae with a dark streak above, widening on the hind femora at 

 apex, and sometimes a dark spot on the outside of hind femora; 

 tibiae also with a dark streak and tarsi dark. Length 6 to 7.3 mm., 

 width 3 to 3.5 mm. 



Type: In Academy of Natural Sciences of Philadelphia (Horn 

 collection), from southern Arizona, H. K. Morrison. 



Other localities: United States: New Mexico: Alamogordo, Organ 

 Mountains; Arizona: Chiricahua Mountains, Cochise County; Texas: 

 McKelligon Canyon, near El Paso, larvae feeding on Salvia vinacea 

 Wooton and Standley, H. S. Barber. Mexico: Zacualtipan, Hidalgo, 

 Hoge; Jacala, Hidalgo, 4,500 ft., Ralph Haag, 1939. 



Remarks: H. S. Barber collected this rare species in numbers on 

 Salvia vinacea near El Paso, Texas. Previously it had been known 

 only from Arizona and New Mexico. Under D. horni Jacoby in the 

 Jacoby material in the Bowditch collection are three specimens col- 

 lected by Hoge at Zacualtipdn, Hidalgo, Mexico, that are a little 

 darker than the more northern specimens but cleai'ly D. tenuicornis 

 Horn. The long slender antennae, the 2-spotted prothorax, and 

 the narrow elytral vittae coupled with the shape of the aedeagus 

 characterize this species. It is not closely related to any other. 

 D. jigurata Jacoby has somewhat the same markings in the darker 

 specimens with dark vittae, but is a more slender beetle and the vittae 

 are wider. 



