AKJ.9 FLIES OF THE GENUS STYLOGASTER ALDRIOH 9 



Female. — Ovipositor rather short and thick, the short basal seg- 

 ment blackish, following one brOwn, indistinctly yellow at apex ; last 

 segment black, apical half yellowish. Front coxae with ordinary 

 smallish black bristles. 



Length, male T.5 mm., female 6.5 mm. to ovipositor, which is 

 nearly 3 mm. long. 



Redescribed from four females and one male; all but one female 

 were taken at Santa Cruz, Rio Grande do Sul, Brazil, and were 

 received from Dr. O. Krober, under the name of stylosa Townsend, 

 and were so mentioned by him in his revision of the genus; the other 

 female is from San Bernardino, Paraguay (K. Fiebrig). One of 

 the Santa Cruz females has been compared with the type in the 

 Zoological Museum in Copenhagen by Doctor Lundbeck, who writes : 



The type of Stylogaster stylata Fabricius is in our collection (Sehestedt 

 Collection), but it is a very bad specimen, and the abdomen is lost, so that the 

 important characters of this can not be identified. Otherwise the two specimens 

 are quite alike; the color and shape of the head, the ocellar triangle, the 

 antennae, the legs, and the venation of the wings, all are quite the same, so 

 that I think it certain that the two specimens are the same species. 



STYLOGASTER STYLOSA Townsend 



Stylogaster stylosa Townsend, Annals and Mag. Nat. Hist., ser. 6, vol. 19, 

 1897, p. 24.— Kkober, Ent. Mitteilungen, vol. 3, 1914, p. 344 (part) ; 

 Arch. Naturgesch., vol. 83, 1917 (1919), p. 44, pi. 8, figs. 55, 55o, 55&. 



Stylogaster horvathi Szilady, Ann. Mus. Nat. Hung., vol. 24, 1928, p. 592, 

 fig. 2. 



Male. — Greatly resembles stylata, agreeing in the absence of the 

 humeral bristle, the single notopleural, and one supraalar. Frontal 

 triangle a little shorter, the black color of the front extends farther 

 forward, fading gradually close to the lunule or sometimes reaching 

 it; the second antennal joint is much blacker; the bristles on the 

 sides of the first abdominal segment are nearly all black, arising 

 from the white part of the segment; those at the tip of the front 

 coxae are entirely black, the erect pile on the inner and under side 

 of the hind femur continues to the end; and the first posterior cell 

 is narrower, the last section of the fourth vein being much less 

 strongly curved. The first posterior cell is, however, wider than the 

 submarginal. The second abdominal segment is much darker; the 

 genitalia appear to be nearly the same, the oval aperture inclosed 

 between the posterior forceps is very distinct with its margin of 

 pale hairs. 



Female. — Ovipositor about as in stylata, its basal joint mostly 

 yellow. 



Length, male 6.5 mm., female 5.5 mm. to ovipositor, the latter 

 about 3 mm. 



2659—30 2 



