42 PROCEEDINGS OF THE NATIONAL MUSEUM vol. S3 



6. Front and face silvery-gray pollinose; parafacial bearing usually several 



easils discernible hairs on upper side below frontal bristles, these hairs 

 rarely absent; thorax light brown on sides and black on dorsum; femora 

 light brown, concolorous with tibiae, and about same color as sides of 

 thorax; midtibia with one anterolateral bristle about the middle with 

 one or more above, with usually none below but when preseni small. 



Abdomen, including dorsal shoulders of first segment and hind margins 

 of second and third segments, covered with gray pollen without sheen ; 

 abdominal vitta obscure and not clearly marked, especially on third 

 segment when held in a light that does not allow reflection of pollen 

 to vary on either side; sides of male abdomen more or less broadly 

 and distinctly rufous. A lighter, more brownish form than Carcelia 

 laxifrons, the ii often mixed with a brownish, tinge 



5. ma'aco-o^ p. 50) 



Abdomen mostly yellow, with a narrow black vitta on dorsum. A li; 

 more yellowish form than Carcelii ■■ (male only) 



6. protuberans (Aldrich and Webber) (p. 04) 

 Front and face silvery-gray pollinose, with a smoky tinge; parafacial u 

 bare mi upper side below frontal bristles, when present hairs one or two 

 in number are smaller, not so distinctive, and difficult to locate without 

 aid of higher powers of binocular; thorax black on sides and dorsum; 

 femora black contrasting with brown tibia, mid-tibia with one antero- 

 lateral bristle about middle with one or more smaller above, and usually 

 one below sometimes quite long; hind tibia appearing to be more sub- 

 ciliate but not distinctly so; abdomen covered with gray pollen, dorsal 

 shoulders of first segment thinly pollinese, very narrow apical margins 

 of second and third segments black; abdominal vitta clearly marked or 

 defined especially on third segment, when held in a light that does not 

 allow reflection of pollen to vary on either side; sides of male abdornen 

 blacker, only obscurely rufous on intermediate segments. A blacker 

 form 7. laxifrons Villeneuve (p. 54) 



7. Front tibia with two median posterolateral bristles; legs never wholly 



black 11 



Front tibia with one median posterolateral bristle 8 



8. Median inner ventral bristle on midtibia present 9 



Median inner ventral bristle on midtibia lacking 



8. separata (Rondani) (p. 56) 



9. Two sternopleural macrochaetae, legs black 10 



Three sternopleural macrochaetae 9. lagoae (Townsend) (p. 58) 



10. Row of discal macrochaetae on fourth segment 



10. fiavirostris (Van der Wulp) (p. 60) 

 No discal macrochaetae, legs wholly black 



11. diacrisiae, new species (p. 61) 



11. Femora black and tibia brown or yellow, not concolorous 12 



Femora and tibia yellow, concolorous 12. amplexa (Coquillett) (p. 63) 



12. Abdomen reddish yellow on sides; male usually with one reclinate upper 



frontal bristle and two reclinate prevertical bristles; female with one 

 pair of marginal macrochaetae on s bdominal segment; male and 



female with one strong inner ventral bristle on midtibia, longer than and 

 situated higher on tibia toward femur than the lower of the two median 



posterolateral bristles 13. perplexa, new species (p. 65) 



Abdomen predominantly Mack with reddish-yellow areas on sides in male, 

 female black but sometimes reddish yellow; male with only two reclinate 



