/ 



104 



5. Abdomen wholly covered with ])ollen, opaque; face yellowish polli- 

 ]i()se, third antemial joint four times as long- as the second; 

 black, the i)alpi usually and apex of proboscis, yellow, a spot 

 on sides of abdomen of male and the tibia' also sometimes yel- 

 ^(^ low; front of the male three-fifths, of the female three-fourths, 



as broad as either eye, two pairs of orbital bristles in the female, 

 il/t^euL^Ki, none in the male, frontal bristles descending below the arista, 

 '^^'=» • cheeks one-fourth as broad as the eye height, antennjc nearly 

 as long as the face, arista thickened on the basal third, facial 

 •ridges bristly on the Imver four-fifths; thorax, gray poUi- 

 nose, marked wita four black vittfc ;/Ji^ristly hairs of abdomen 

 depressed, first two segments each bearing a marginal ])air, the 

 third Avith a marginal row, the fourth with a discal and a 

 marginal row of macrocha'tie; wings hyaline, base of third 

 vein bearing two bristles, fourth vein strongly arcuate beyond 

 the bend; calypteres white; length, 7 to 11 mm. Dist. Colum- 

 bia; Lexington, Ky., and Tenn. Three males and two females. 



Type No. ,'1004, U. S. National Museum Jeucanicc u. sp. 



Abdomen destitute of pollen on the broad ai)ices of the last three 



^^ segments, face white pollino>a e , third antenna! joint from two 



Uc-^-^ii^x-^ irirr jii)(\ one-half to three times as long as the second, front of female 



)3/V4r«''V4*-^^, from live sixths as wide as to slightly wider than either eye, 



j*^— _ ^ frontal bristles descending almost to apex of second antenual 



\ ' i^xutt^ ca — JL joint, facial ridges bristlv on tjie basal two-thiiTls, third vein 



J.VV' t-**—^ 1 c , . " , afuCctJl tf .f t l H , ^ »_tnj^<KW 



J _ ' 1u^ . bearing two or three bristles at' the base^econd and third seg- 



g ments of abdomen sometimes bearing discal macrocha^tic; 



'^' length, f) to 8 mm.; otherwise as in the above description of 



leucama\ Northern Illinois, Missouri, Colorado, and Mesilla, N. 



Mex!A^(i^irst Kept. Insects of Missouri, p. Ill; March, 1869: 



LydeUa.) (P.^.r.'J. ^hi>rP.ki?^.^A). dorijphorw Eiley. 



G. Middle tibiiHi each bearing two or more macrochajtiie on the front 



side near the middle 7. 



Middle tibia» each bearing a single macroclneta on the front side 



near the middle, sides of face below the lowest frontal bristles 



yn (X^<y\^j8L/ir>^ 1 J bare, arista thickened to the middle, the penultimate joint only 



%ik U-f, slightly longer than broad, front in each sex one and one-fourth 



11 times as wide as either eye, frontal bristles descending below 



the arista, third joint of antenna^ in the male six, in the female 



four, times as long as the second ; palpi yellow; length, 8 to 9 



mm. Dist. Columbia, Bhiffton, S. C, and Missouri. (In Scud- 



der's Butt. New England, A^ol. III,p.l922; 1889) .comstocki Will.=^^}=- 



7. Sides of face below the lowest frontal bristles bare, arista thickened 



on the basal three fourths, the penultimate joint three times as 



long as wide, front in each sex one and one-fourth times as 



broad as either eye, frontal bristles descending below the arista, 



