ADAMS: DIPTKRA AFRICANA. 163 



lar band, both ends of which bend backward ; venter of third 

 segment wholly black ; otherwise as in male. Length, 13 mm. 

 Three specimens ; September. 



Eristalis dissimilis, n. sp. 



Male : Eyes contiguous above, brownish pilose, which is most 

 prominent above, and with numerous small blackish spots ; 

 vertical triangle black pilose ; front and face black, grayish 

 pollinose and white pilose, facial tubercle and oral margin shin- 

 ing yellowish, sides of face on lower half nearly devoid of 

 pollen; cheeks black, mostly shining; occiput yellowish-gray 

 pollinose ; proboscis shining black ; antennae yellow, upper mar- 

 gin brownish black, brownish arista bare. Thorax yellowish- 

 gray pollinose ; mesouotum with four bronze, subshining vittae ; 

 pile light yellow ; scutellum yellowish translucent, pile of base 

 and margin light yellow, that of the dorsum black ; halteres 

 yellow; pleurae largely subshining black. First abdominal seg- 

 ment gray pollinose, yellowish on sides, second segment yellow, 

 with an opaque, black cross-band on base attenuated laterally, 

 the apical cross-band is not attenuated laterally, is narrower 

 and opaque black except centrally along posterior margin, where 

 it is shining bronze, in most specimens the two bands are nearly 

 connected centrally by a brownish longitudinal vitta ; third 

 segment yellow, posterior margin broadly subshining black, a 

 brown spot centrally on anterior part ; fourth segment shining 

 black, anterior margin, except laterally, reddish yellow, back 

 of this is a narrow, yellowish-gray pollinose, transverse band, 

 sometimes interrupted in the middle ; hypopygium shining 

 black ; pile of abdomen yellow, on dorsum of first segment, and 

 lateral margins of remaining segments, white. Legs shining 

 black, base of femora indistinctly, knees, basal two-thirds of 

 the four anterior tibiae, base of hind tibiae narrowly, and the 

 tarsi, except the third and fourth joints of the four anterior feet 

 and last three joints of hind feet, yellow ; pile of femora whitish, 

 different parts of tibiae and tarsi covered with pile of the same 

 color. Wings hyaline, veins brownish, stigma small. Length, 

 10 mm. 



Six specimens ; September. 



2-Bull., Vol. Ill, No. 6. 



