218 THOMAS SAY FOUNDATION 



and outer vertical present; ant acr somewhat stouter 

 than in male; but not very distinct; scutellars as in 

 male; fourth abdominal segment golden pollinose, 

 and mostly yellow in ground color; genital segment 

 almost concealed by the folding together of the sides 

 of the fourth segment. 



Length 6-8 mm. 



Five males and five females; one male is from 

 Mayaguez, Porto Rico, collected by II. H. Van Zwa- 

 lenburg, April 15, 1914; another male from the same 

 place November 2, 1914, comes from some material 

 that was identified by Coquillett as Sarcojjkaga in- 

 certa Walk.; a third male from Nassau, Bahamas, 

 December 14, 1912 (F. Knab) ; a female from Miami, 

 Fla. (Mrs. C. H. T. Townsend). All the forego- 

 ing are in the National Museum. One male in the 

 American Museum of Natural History from 

 Naguabo, Porto Rico, March 7-9, 1914; one male and 

 four females from Havana, Cuba (C. F. Baker), in 

 my collection. 



Holotype.— Male, No. 20547, U. S. N. M., from 

 Mayaguez. 



" Allotype.— Female, No. 20547, U. S. N. M., 

 from Miami, Fla. 



The name iiicerta Walk, has been used several 

 times in literature, but apparently not always for the 

 same species. The species so reported in Canadian 

 Entomologist, xxxiii, 43, as bred from cow-manure 

 in Virginia, and again in the same, xliv, 181, from 

 Dallas, Texas, may not have been the same one, as I 

 have seen none of this species from those regions. 

 For the same reason I doubt the occurrence at Me- 

 silla Park, N. M., recorded by Professor Cockerell 

 on Coquillett's identification. Johnson, Psyche, xv, 

 75, reports a species from the Bahamas as incerta 

 Walk., probably the present one. Banks describes 

 a larva from cow mamn*e (Tech. Bull. 22, Bur. Ent., 

 16, pi. iv, f. 75), probably not the present species. 



The nearest allied species do not have any vil- 

 losity on the hind tibiae ; see list of them under assidua. 



