36 Psi/che [February 



16. Anteniiie with flagellum light yellow; tliorax imiforinly yellow; [abdomen 



with segments 3-7 with brown spots; wings brownish, lighter-colored in the 



interior of the cells]. (Mexico.) flavida Will." 



Antennae brown or black; thorax yellow with black lateral spots or stripes .... 17 



17. Antennae black; a large black spot on mesonotum above each wing; abdomen 



black excepting segments 1-4 ami 9. (Mexico.) bninncipes Will." 



Antennte brown ; a short black stripe on each side of the mesonotum ; abdominal 

 segments 1-4 with a narrow posterior black band; remaining segments 

 black excepting their yellowish bases. (Mexico.) 

 willistoni Alex. ( =fasciata Will.) preocc." 



18. Cell 1st Mi far out toward the wing-margin, so that Cu\ beyond this cell is 



shorter than Cui+Ma; that portion of Ri between cross-vein r and Sci, very 

 thin, indistinct; [antennae of the cf very long, filiform, twice as long as the 



body]. (Eastern Brazil.) macrocera, sp. n. 



Cell 1st Mi nearer to the wing root, so that Cui beyond this cell is as long 

 or longer than Cui + Mi ; Ri between r and Sci equal to the remainder of 

 Ui in thickness; [antennse of the known cf's short] 19, 23 



19. Males with the frontal tubercle produced into slender horn-like points which 



are directed laterad; [abdomen with a subterminal black band]. (Bolivia.) 



cornigera, sp. n. 



Males (as known) with the frontal tubercle normal 20 



20. No conspicuous black subapical band on the abdomen; stigmal spot conspic- 



uous; [length about 19 mm; wing 17 mm.]. (British Guiana — Eastern Brazil.) 



kaieluretisis, sp. n. 



A conspicuous sub-apical dark brown or black band on the abdomen 21 



21. Larger species; [length, 20 mm.; wing, 18 mm.; [Sci longer than Sci]. (Ecuador.) 



oltausiana End." 



Smaller species [length, 15 mm. or less] 22 



22. .\ntennae brown; body coloration dull brownish-yellow. (Peru.) 



peruviana, sp. n. 



.Vntennte yellow; body coloration yellow and black. (Mexico — Costa Rica.) 

 zonala O. S." 



23. Komales (as known) without a subapical black band on the abdomen; [length 



25-28 mm.; wing, 20-21 mm.]. (British Guiana— Eastern Brazil.) 



kaieturensis, sp. n. 



Females (as known) with a subapical black or blackish band on the abdomen 24 



24. Mesonotum uniformly reddish-yellow; [antennae brown; wings tinged with 



brownish]. (Honduras.) obsolela W'ill." 



Mesonotum longitudinally striped 25 



25. Scape of the antennae yellow; legs yellow, segments tipped with black; Sc, 



longer and more conspicuous than Sci. (Mexico — Costa Rica.) zonala O. b." 



" Williston, S.; Biologia Ccntr. .Americana; (suppl.; Dipt.; vol. I); p. 227; 1900. 



« Williston, S.; 1. c, p. 227; pi. 4, fie. 5; 1900. 



■J WiUiston, S.; 1. c, p. 226; pi. 4, fig. 10; 1900. 



» Enderlcin, G.; Zool. Jahrbuch.; vol. 32, pt. 1; p. 45. 46; fig. A>; 1912. 



"Ostcn Sackcn, C. R. R.; Biologia Cent. Amcr.; Dipt., vol. I, p. 10; 1886. 



>• Williston, S.; Biologia Cent, .\nier.; Dipt.; vol. I (suppl.) ; p. 227; 1900. 



