18 PKOCEEDINGS OP THE NATIONAL MUSEUM vol.72 



96. CHAETONA LONGISETA Wiedemann 



Dexia lonffiseta Wiedemann, Auss. Zweifl., vol. 2, 1830, p. 381. 



Viviana citrina Bigot, Annales Soc. ent. France, 1889, p. 262. — Bratjee, Sit- 



zungsber. Kais. Mus., vol. 106, p. 7. 

 Chaetona longiseta Van der Wulp, Biologia Dipt., vol. 2, 1891, p. 253, pi. 6, 



fig. 8. — Brauer and Bergenstamm, Denk. Wien. Akad. Wiss., vol. 50, 1891, 



p. 378. 



One female, "Brasilia," " longiseta Wd. coll. Winthem," and B. B. 

 label. Undoubtedly the type, as the plumosity of the arista is matted 

 together by treatment with a solution as Wiedemann says. A second 

 specimen, a male, is erroneously labeled icterica, but does not agree 

 with the type of that species ; it is also from Brazil and in " coll. 

 Winthem," 



The genus Chaetona was established by Van der Wulp (see above) 

 for this and another species. Coquillett designated longiseta as the 

 genotype in his Type Species (1910, p. 521). A female in the Na- 

 tional Museum from Caura Valley, Venezuela, was correctly identi- 

 fied by Townsend ; and I have lately added a male, collected by me at 

 La Providencia, Siquinala, Guatemala, April 16, 1926. 



Van der Wulp's description and figure are very recognizable, but 

 he shows the abdomen too broad near tip, and the profile shows the 

 front too prominent and bulging. The exceptionally long arista with 

 short, delicate plumosity is a very striking character. 



97. CHAETONA ICTERICA Wiedemann 



TacMna icterica Wiedemann, Auss. Zweifl., vol. 2, 1830, p. 321. 

 Chaetona icterica Bratjer and Bergenbtamm, Denk. Wien. Akad. Wiss., 



vol. 58, 1891, p. 378.— Townsend, Annals N. Y. Acad. Sci., vol. 7, 1892, 



p. 22. 



Two males from the Winthem collection are so labeled, but not 

 called types; both are from Brazil. One is Chaetona longiseta 

 Wiedemann, but not the type specimen; this I eliminate from 

 icterica. The other is a different species, and agrees with the descrip- 

 tion of icterica; undoubtedly the type. 



Male. — Eyes bare; front narrow and rather prominent below, at 

 narrowest 0.19 of headwidth by micrometer; a single pair of smallish 

 verticals; ocellars small, proclinate; f rentals about ten, the upper- 

 most two reclinate, lowest at middle of second antennal joint (lower 

 on one side than the other) ; parafrontals and parafacials yellowish 

 poUinose, dull, the latter bare and as narrow as third antennal joint. 

 Antennae black, slender, third joint nearly four times the second 

 and slightly enlarged toward tip, arista slender except on basal 

 fourth, less than twice as long as third antennal joint, with perhaps 



