lOlil Ahrnmler — Sew or Litlle~kiioun Xcolropicat Ilcxalomini 85 



7. Li-ys willi llio tibiiv, at least the posterior ones, «illi a broad while ring 8 



Legs willioul white bands 9 



8. Thorax uniforml.v blaek; [head ,ind ],:,sr ..f :nil<iiii;T' miifnniily (icry niidisli- 



yeMow: wing band yellow; anal ells ;i lilll,- Irs. brown than rest of the brown 



band]. (IJrazil.) tunioplera Wied.' 



Thorax not iniiformly blaek, dorsum miv f.iinlly striped, pleura,' sooty-brown; 

 [abdomen blaek; a scoriaceous, bluisli-blaek band at the base of each seg- 

 ment]. (Brazil.) caniinaria Wied.' 



9. Femora banded with yellow rings on a darker ground; [large, 9 , length, 18 mm.; 



head yellowish-orange; first antennal segment brown; abdomen with seg- 

 ments 2, 3, 4 and the terminal ones yellowish-orange, the others black]. 



(Brazil.) fasciata Guer." 



I'eniora not banded with yellow rings; legs yellow, brown or blaek usually 

 darkening toward the tips of the .segments 10 



10. Antenna" entirely orange; [larger; 9, length 15 mm.; wing-bands pale yellow]. 



(Brazil.) riificorms Macq.' 



Antenna' with only the scape orange, flagellum brown; [snudler; 9 less than 

 12 mm.] 11 



11. Thoracic dorsum blackish-grey Irivitlatc- wllh black; [wiiif; band and anal cells 



yellowish]. (Brazil.) w./,/,,,,.-™ \Vicd.< 



Thoracic dorsum neither grey, nor trix ittalc ivith black 12 



li. .Xbdonien black, at base of each .segment a shining, scoriaceous, bluish-black 

 band. [This species is also inclnded in couplet 8; Wiedemann does not 

 mention white tibial bands, but specimens which Schiner determined as being 



riimtiiaria had white on the tibia?]. (Brazil.) caminaria Wied.» 



.\bdominal segments 2, 3, and sometimes 4, witli at least the caudal margins 

 whitish; bases of the segments usually red<lish. (Xorlliern S. .\merica.) 



longinlylu .\lex. { = crylhrncephaUi Fabr.) proocc.i 



IS. Abdomen mostly yellowish or yellowish-brown, usually with a black band be- 

 fore the tip 14 



Abdomen mostly black or blackish 26 



14. Frontal tubercle black or blackish 15 



Frontal tubercle yellowish or reddish 18 



15. Thorax red between the pronotum ami the suture, with a dark median line; 



[abdominal segments 6 and 7 black; wings pale brownish; cf , length, 15 



mm.]. (Mexico.) mesoxantha O. S.'» 



Thorax yellow or reddi.sh-yellow, without a dark median line 16 



• Wiedemann. J.; .\ussercur. zweifl. Insekt; vol. I, p. 28; (Limnobia); 1S28. 



•Wiedemann, J.; 1. c.; vol. I, p. 31; (Limnobia); 182S. 



•Gucrin, F. C; VoyagcdelaCoquillc.; Zodl.;vol. 2, pt. 2; p. 287; pl.20.f.2; {Eca 



30. 



' Macquart, J.; Dipt. Exot.; vol. 1, pt. 2; p. 176, 177; (Cylittdroloma): 1838. 



■ Wiedemann, J.; Aussereur. zweifl. Insekt; vol. I, p. .WS; iLimnobia); 1828. 



'Fabricius, J.; Syst. Antliar ; p. 31; (Tipula); 1805 



"Osten Sackcn, C. U. U.; Biologia Ceutr. Americana; Dipt.; vol. I; p. 10; 1SS6. 



