228 ERNEST A. BACK. 



Lapliysta sexfasiata. 



Dasypogon sexfasciata Say, Jour. Acad. Sci. Phil., Ill, 50, 1822; 

 Compl. Works, II, 64. 



Dasypogon sexfasiata Wiedemann, Auss. Zw., I, 408. 



Laphyctis sexfasiata Schiner, Ver. Zool.-Bot. Ges., 1866, 693. 



Laphystia sexfasiata Loew, Berl. Ent. Zeit., 1874, 373. 



Triclis notata Bigot, Annales, 1878, 433 : Bull. Soc. Ent. France, 

 1879, 87. 



Laphystia subfasiata Bigot, Annales, 1879, 236. 



Laphystia sexfasiata Williston, Trans. Am. Ent. Soc. Phila., XI, 

 9; XII, 53. 

 cf 9. — Length 8-11 mm. — Hind femora and all the tibiae at base and 

 the knees yellowish; head and thorax grayish- white pruinose with 

 fine white pile; abdomen above polished black, the posterior margins 

 of all the segments with a rather broad grayish pruinose band which 

 is interrupted on all the segments except the first and second. 



Pile of entire head and thorax snow-white; that on the face and 

 lower occiput dense, that on the front, ocellar tubercle and upper 

 occiput sparser and erect; the bristles of the occiput are fine and 

 cannot be distinguished as such. Antennae wholly black; the first 

 segment with white bristles beneath, the second appreciably shorter 

 than the first and more slender, the third segment a trifle longer than 

 the first two segments taken together. Thoracic dorsum grayish- 

 white pruinose, showing two indistinct median and two broader 

 lateral stripes, the latter distinctly divided at the transverse suture 

 by a line of whitish bloom. Pleurae densely grayish-white pruinose, 

 the pile of both dorsum and pleurae fine and white; the bristles of the 

 lateral margins of the dorsum not well developed, scutellum every- 

 where with moderately dense white pile. Abdomen as described 

 above, the pruinose bands are slightly tinged with yellow, all the pile 

 white, longest on the sides; the bristles on the middle of the lateral 

 margins rather obscure, venter grayish pruinose. Legs black, the 

 bases of the hind posterior femora and occasionally those of the 

 middle pair and the bases of all the tibiae yellowish or reddish; pile 

 and bristles wholly white; pulvilli pale; the bases of the claws white. 

 Wings hyaline, the veins toward the base yellowish. 



Type. — Lost. 



//a627a^.— Avalon, N. J. (July 29, Aug. 2, 15, 27); N. Y. 

 (Aug. 10); N. C. ; Capon (Apr. 19) and St. Augustine (common 

 along seashore, June, July, C. W. Johnson); Ga. ; Tex. 



Dr. Williston has taken specimens of this genus from Mon- 

 tana and the Southern States, and regarded some of them as 

 varieties of sexfasiata. Since then Mr. Coquillett has described 

 the three following species. Mr. Jones, in Trans. Am. Ent. 



