109 



of second joint of autenn:e, cheeks one-uintli as wide as the eye 

 height, vibrissie slightly below the level of front edge of oral 

 margin, ridges bristly on the lowest third, antennse almost as 

 long as the face, the third joint tive times as long as the second, 

 arista thickened on the basal fonrth, the pennltimate joint shorter 

 than broad; thorax gray poUinose, marked with fonr black 

 vitta^, scutellum bearing three pairs of marginal macrochjetae 

 and a short apical pair, abdomen opaqne gray i)ollinose, each 

 segment bearing marginal macrocha^tjie, middle tibia^ each hav- 

 ing a single one on the front side near the middle; wings hya- 

 line, third vein bearing from three to six bristles near its base, 

 fourth vein beyond the bend strongly arcuate, calypteres whit- 

 ish; length, 9 mm. Missouri, Two female specimens. Type 

 ^o. 3009, U. S. National Musenja—- ^-rr-r^rTT. . . ^.sfenuilis n. sp. 



2. Palpi yellow . ^r-r-r-r-rrrrTTTTTTTr 3. 



Palpi usually black, fourth segment of abdomen and apex of scutel- 

 lum 3'ellow; middle tibi;e each bearing a single macrocha'ta on 

 the front side near the middle, third vein bearing two or three 

 bristles near the base; black, apex of scutellum and of fourth 

 segment of abdomen, also sometimes the palpi, yellow; front 

 of male one half, of the female four-tifths, as wide as either eye; 

 two pairs of orbital bristles in the female, none in the male; 

 frontal bristles descending nearly to apex of second joint of 

 antennje, cheeks one-sixth as wide as the eye height, vibrissse 

 on a level with the front edge of oral margin, three bristles 

 above each, antenna' almost as long as the face, the third joint 

 in the male three and one-half, in the female two and one half, 

 times as long as the second, arista thickened on the basal two- 

 fifths, the penultimate joint as broad as long; thorax gray polli- 

 nose, marked with four black vitta', scutellum bearing four 

 nmrginal pairs of macrochitta' ; abdomen on the second and 

 third segments gray pollinose and with darker reflecting spots, 



bearing only marginal macrocha'ta'; wings hyaline, fourth vein ^^ ^Z^f-^^a:^ 

 beyond the bend strongly arcuate, calypteres white; length, 6 vJ-v--^ 



mm. Cape Cod, Mass., and Piney Point, Md. A specimen of 

 each sex; the male bred October 7, 1889, from a species of Phy- 

 ciodes. Type No. 3010, U. S. National Museum . . phycioiUs u.sp. 



3. Middle tibia' each bearing a single macrocha'ta on the front side 



near the middle ^=fcf^i_i ^"*' 



Middle tibiic each bearing t4iro e or more macroclnetic on the front 

 side near the middle, apex of abdomen black 4. 



4. Abdomen destitute of discal macrochaita' on the second and third 



segments, the fourth wholly covered except on the base, none of 

 the raacrochiet;e on this segment more than three-fourths as 

 long as those on the third; apex of scutellum broadly yellow, 

 third vein bearing two bristles at its base; length, 9 to 11 mm. 



