Dec. 1897] TOWNSEND : DiPTERA FROM THE TaMAULIPAN REGION. ] 75 



Eristalis tricolor Jaenn. 



Thirty-three ^'s and eight $'s, as follows: San Tomas, one $ 

 June 16, and one 9 June 23, in palmetto jungle. Brownsville, six ^ 's 

 and one 9 taken on flowers of Lippia lanceolata Michx, June 2 2; one 

 $ taken on flowers of Gaillardia pulchella Fong, June 23; twenty- 

 four $ 's and six 9 's taken on flowers of Lippia lanceolata, June 24; and 

 one $ , June 28. 



The ^ taken June 16 shows a very faint line of brown on posterior 

 half of edge of second abdominal segment, and a still fainter trace on 

 third segment. Face silvery-white, with whitish-brassy pile. Front a 

 little cinereous, with longer hair of same color as that on face. Anten- 

 nse brownish yellow. Front and middle knees yellowish, extending half 

 way down tibiae, the rest of middle tibiffi yellowish brown, only the ex- 

 treme proximal end of hind tibiae yellowish. Wings very faintly flavous 

 tinged on antero-basal position. Length, 10)^ mm. 



The other specimens measure from 8 to 1 1 mm. in length. They 

 are all quite constant in abdominal coloration. All the 9 's, however, 

 and a very few of the $ 's, show gradations to a variation (9 of 

 June 22) in which the black thoracic band is rather deeply invaded an- 

 teriorly in the middle by the cinereous, and also has an arcuate border of 

 cinereous behind next the scutellum and entendingto wing bases on each 

 side. This makes the thorax wholly cinereous excepting a pronounced 

 lunate band of black before hind margin, with its concavity forward. 

 The scutellum is yellow as in other specimens. 



Eristalis vinetorum J^a3. 



Brownsville, June i, two specimens, ^,9. One $ on flowers of 

 Verbesina encelioides Benth & Hook., June 18. One $ on flowers of 

 Monarda clinopodioides Gray, and two $ 's on flowers of Lippia lanceo- 

 lata Michx., June 22. Three <? 's and four 9 's taken on flowers of 

 Gaillardia pulchella Fong. Also ^, 9 , July 3. San Tomas, four ^ 's 

 June 9 and 23, in palmetto jungle. 



Length, n to 13 mm. All agree closely with Williston's descrip- 

 tion, except that the fourth abdominal segment in his specimens was a 

 little retracted, thus hiding the opaque black transverse fascia on ante- 

 rior border. 



CONOPID^. 

 Zodion albonotatum, sp. nov. 



Two specimens ; one, Brownsville, June 24 ; the other, woods 

 back of Fort Brown, July 3. Both taken on flowers of Lippia lanceo- 

 lata Michx. 



