94 GEO. H. HORN, M. D. 



The only variation observed is in the tendency of the antennse to 

 become ferruginous. 



Occurs from Texas southward through Mexico to Columbia, S. A. 



D. loiigicornis Say, Journ. Acad, iii, p. 460; ed. Lee. ii, p. 223. — Oblong;, 

 moderately elongate, entire body and legs yellowish white, or with a slight 

 tinge of green. Antennse slender, longer than half the body, pale brown or 

 ferruginous, joints 2-3 small, the third a little longer, the two together not lon- 

 ger than the fourth. Head smooth, vertical fovea not deep. Thorax a little 

 wider than long, sides arcuate iu front, slightly sinuate posteriorly, disc convex, 

 with a moderately deep fovea each side, surface smooth. Elytra distinctly wider 

 behind the middle, surface moderately coarsely and closely punctate, disc vaguely 

 subsulcate, and with a costiform elevation from the umbone two-third to apex. 

 Abdomen very sparsely punctate; tibise distinctly carinate. I^ength .20 — .22 

 inch. ; 5 — 5.5 mm. 



3Iale. — Last ventral truncate and slightly emarginate; first joint of anterior 

 tarsi dilated. 



Female. — Last ventral narrowly oval at tip ; tarsi not dilated. 



No variations have been observed. This is the only species in our 

 fauna in which the entire body and legs are uniformly pale. 

 Occurs from the Middle States westward to Kansas. 



D. virgifera Lee, Trans. Am. Ent. Soc. 1868, p. 59. — Oblong, nearly par- 

 allel, pale yellow head ; metasternum, tibite and tarsi black. Antennfe black, 

 three basal joints testaceous, joints 2-3 small, together but little longer than 

 half the fourth. Head smooth, vertical fovea moderately deep. Thorax very 

 nearly as long as wide, not narrowed in front, sides slightly sinuate behind the 

 middle, disc smooth, bifoveate; scutellum piceous. Elytra nearly parallel, mod- 

 erately closely punctate, smoother near the apex, surface vaguely sulisulcate, 

 with an obtuse costa from the umbone three-fourths to apex ; color pale yellow, 

 or with a slight greenish tinge, a narrow, sutural, piceous vitta, and one from 

 each umbone extending three-fourths to apex. Abdomen yellow, obsoletely 

 punctate; tibiae and tarsi black, femora yellow, sometimes with an upper line 

 piceous. Length .20— .24 inch. ; 5—6 mm. 



Male. — Last ventral segment truncate ; tarsi not dilated. 



Female. — Last ventral oval at tip. 



The type described by LeConte, as well as my own, have doubt- 

 less been decolored by immersion in alcohol. More recent specimens 

 show that the true color is slightly green. The sutural and lateral 

 vitt^B are apt to be much reduced in extent. While the second and 

 third joints are usually small and scarcely longer together than half 

 the fourth, one specimen has these two nearly equal to the fourth. 



Occurs at Fort Wallace, N. Mex., southern Arizona and northern 

 Sonora. 



D. filicoriiis n. sp — Oblong, similar in form to vittata, color piceous black ; 

 thorax, side margin, and apex of elytra and abdomen yellow. Autennse slender. 



