26 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 93 



and vertical bristle; outer vertical rather weak; facial ridge bristly on 

 lowest one-fifth; gena one-fifth eye-height, covered with white hairs, 

 a row of black bristles along its anterior margin; third segment of 

 antenna three and one-half to four times second; arista thickened on 

 basal one-third, penultimate segment short; palpus yellow. 



Thorax covered with golden-brownish pollen, marked with four 

 black mesonotal vittae; scutellum golden brownish pollinose, three 

 pairs of marginal macrochaetae, one pair of discal scutellars; middle 

 tibia with one long median anterolateral bristle, one inner ventral 

 bristle; wing more or less brownish along veins; third vein with three 

 bristles at base. 



Abdomen gray-pollinose underneath on venter, basal three-fourths 

 of segments 2 and 3, and basal four-fifths of segment 4 golden-polli- 

 nose, heavily covered with a brilliant green ; dorsum of first segments 

 and apical borders of others shining black; first and second segments 

 with a pair and the third and fourth with a row of marginal macro- 

 chaetae ; second and third segments with a pair and the fourth with a 

 row of discal macrochaetae. 



Type locality. — Tafi Viejo, Tucuman, Argentina. 



Type.— Female, U.S.N.M. No. 54137. 



Host. — Unknown. 



Remarks. — The material examined consisted of one female, Tafi 

 Viejo, Tucuman, March 14, 1927 (Shannon), labeled "Exorista coerule- 

 iventris V.d.W.," "comp. type J.M.A." This specimen is not Zenillia 

 lincata (Van der Wulp) {=Exorista coerideiventris Van der Wulp). 



16. ZENILLIA VIRIDIS (Townsend), new combination 



Chrysoexorista viridis Townsend, Proc. U. S. Nat. Mas., vol. 49, p. 435, 1915; 

 Rev. Mus. Paulista, vol. 15, p. 265, 1926; Manual of myiology, pt. 4, pp. 94, 

 271, 1930. 



TownsencPs male allotype of Chrysoexorista viridis, U.S.N.M. No. 

 19611, is the type and genotype of Chrysophryxe, new genus, tibialis, 

 new species. Townsencl's angustifrons {Chrysoexorista) is not syn- 

 onymous with viridis Townsend. 



Head with front of male at narrowest 0.24 and in female 0.27 the 

 head width; frontal row of seven bristles, extending from on a level 

 with the insertion of arista to the two reclinate preverticals; female 

 with and male without outer vertical bristle; facial ridge bristly on 

 the lowest one-fifth ; gena one-fifth eye height ; third segment of an- 

 tenna in male four times and in female three and one-half times the 

 second; arista thickened on basal one-third, penultimate segment 

 short; palpus yellow. 



Thorax covered with heavy golden-brown pollen, marked by four 

 black mesonotal vittae ; scutellum heavy golden-brown pollinose, three 



