'69 



May 30, 1895, by Mr. C. W. Joluisou. Type Xo. 35G3, TT. S 



National Miiseuiii xiil>op<(ca ii. sp. ^-'*'*^_^ 



2, Abdomen entirely destitute of pollen; len^^th, 4 to ~> mm. WLite ^ 



Mountains, New Hampshire; Massachusetts^ and northern lili- "Vvx^x^^MuPt 

 nois. (Trans. Amer. Ent. Soc., Vol. XYIII, ]). 380; December, * ^cJUji- 



1891.) aira Town. J^t-^iA^. 



Abdomen grayish i^ollinose on the bjises of the last thre*'- segments; 

 length, 4.5 to 7 mm. Maryland; Tifton, (la.; Las Cruces, ^.^ 

 Max.; Canon City, Colo., and Washington. (Can. Kntomoh)gist, ^ 



Vol. XXIV, p. 81 ; April, 1891* : Vhxjio. '^l. encmUnna rn'mmw i vmu i *^---*^ "f^ 

 Townsend^ loo. (mL, p. 109; July. Vhyto ii[(jricornh Townsend, 

 loc. cit., !>. 170; from a cotype specimen.). . .7^. . . senilis To wn. ^ 



Genus SCIASMA, new genus. 



The characters of this genus may be gleaned from the table of genera 

 given in a previous part of the present work and from the following 

 description of the tyj)e species: Black, the antenna; and palpi yellow, 

 the femora sometimes i)artly or wholly yellow ; front of male from as 

 wide to twice asi wide, in tlie fenuile six times as wide, as width of low- ;| 



est ocellus, bare except the frontal bristles which descend to base of i 



second antenna! joint, ocellar bristles wanting, two pairs of orbital 

 bristles in the female, wanting in the male; cheeks one-tenth as wide 

 as the eye-height, sides of face bare, each scarcely as wide as the lowest 

 ocellus, eyes bare, vibrissa' on a level with front edge of oral margin, 

 two or three bristles above each; head at vibrissa' almost as long as at 

 base of antenna', antenme from three-fourths to four-fifths as long as 

 the face, the third joint twice as long as the second, arista bare, thick- 

 ened on the basal fourth, the penultimate joint shorter than broad; 

 body shining, destitute of pollen; two postsutural and three sterno- 

 j)leural macrocha'ta-, scutellum bearing two marginal i)airs, abdomen of 

 four segments, the first two destitute of dorsal macrocha'ta', the third 

 and fourth each with a marginal row, genitalia of male large, curved 

 beneath the third and fourth segments of the abdomen, in the female 

 nearly concealed in the fourth segment; wings hyaline, costal cell 

 brown, a brown spot extending from the hind crossvein to tip of second 

 vein, and from the costa to the foui-th or fifth vein ; third vein bearing 

 a single bristle at its base, hind crossvein straight, at first third or two- 

 fifths of distance from the small to bond of fourth, the latter arcuate 

 and destitute of an appendage, a])ical cell closed, third vein ending at 

 the extreme wingtip, its last section as long as the hind crossvein; 

 calypteres white except ai)ical half of hind ones, which is black; hind 

 tibia' not ciliate, dilated in the male, front pulvilli in both sexes almost 

 as long as the last tarsal joint ; length, .'5 to -4 mm. New liedford, Mass. ; 

 .lamesl)urg, X. ,J., and Tifton, Cla. Twenty-six males and one female, 

 collected l)y Dr. Garry deN. Hough, Mr. C. W. Johnson, and Mr. (i. R. 

 Pilate. Type No. 35G4, U. S. National Museum nehulosa n. sp. 





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