1914] Alexander—New or Little-known Neotropical Hexatomini 35 
Me 
10. 
11. 
12. 
13. 
14. 
15. 
Legs with the tibiz, at least the posterior ones, with a broad white ring........ 8 
Wersayithourtwlitesbands:.-cyie.j cesar eles acre chayy are tory ieuetery eves eles aa es 9 
. Thorax uniformly black; {head and base of antennz uniformly fiery reddish 
yellow; wing band yellow; anal cells a little less brown than rest of the brown 
oat cll] ee a (iaraiztl erent ere ann Pua) oy aoe Skene = tenioptera Wied.‘ 
Thorax not uniformly black, dorsum very faintly striped, pleurze sooty-brown; 
[abdomen black; a scoriaceous, bluish-black band at the base of each seg- 
ETI | Sta Pore Zl) Re ate een LR Te eT Le eae ee Ae caminaria Wied.s 
. 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.). . a: . ..fasciata Guer.* 
Femora not banded wath -yallow rings; ries yellow” brown or black usually 
darkening toward the tips of the segments................5...0..0005 10 
Antenne entirely orange; [larger; 9, length 15 mm.; wing-bands pale yellow]. 
GEST azail 9) eee wag ae terete Ney ee cite cay PRE tae ote a Menlo ts fos ruficornis Macq.? 
Antenne with only the scape orange, flagellum brown; [smaller; 2 less than 
A QR rri trie Peete ee Ae ree RATES CT Sys CR ag Me ABR MAE 11 
Thoracic dorsum blackish-grey trivittate with black; [wing band and anal cells 
Vellowishillves Graz iall) eget mee pete. 2h Sie opc.t 2 Beet sk Gates) aes melanacra Wied.8 
Thoracic dorsum neither grey, nor trivittate with black.................. 12 
Abdomen black, at base of each segment a shining, scoriaceous, bluish-black 
band. [This species is also included in couplet 8; Wiedemann does not 
mention white tibial bands, but specimens which Schiner determined as being 
caminaria had white on the tibiee]. (Brazil.)............caminaria Wied.* 
Abdominal segments 2, 3, and sometimes 4, with at least the caudal margins 
whitish; bases of the segments usually reddish. (Northern S. America.) 
TASB Sac ROR RRS, Pee teh Code a longistyla Alex. (= erythrocephala Fabr.) preoce.s 
Abdomen mostly yellowish or yellowish-brown, usually with a black band be- 
OT AEW UTERO ES Geel ae Ord Et amas en oe a fn ee er 14 
Abdomentmostly: black or blackish: see. .ricscies uh fs es deen awaares es 26 
Prontal tubercle black or blackisht.. 2 20-6 Seo ecco once ce su oaklaew ene ses) 15 
iBrontallituberclesyellowishvormeddish sense) eee ese ene 18 
Thorax red between the pronotum and the suture, with a dark median line; 
[abdominal segments 6 and 7 black; wings pale brownish; <’, length, 15 
mT | Sea (NEXICOS) Mapp fra Piece Sits ats hS epee area’ mesoxantha O. $.19 
Thorax yellow or reddish-yellow, without a dark median line............... 16 
4 Wiedemann, J.; Aussereur. zweifl. Insekt; vol. I, p. 28; (Limmnobia); 1828 
5 Wiedemann, J.; l. c.; vol. I, p. 31; (Limnobia); 1828. 
6 Guerin, F. C.; Voyage de la Coquille.; Zo6l.; vol. 2, pt. 2; p. 287; pl. 20, f.2; (Eva nioptera); 
1830. 
7 Macquart, J.; Dipt. Exot.; vol. 1, pt. 2; p. 176, 177; (Cylindrotoma); 1838. 
8 Wiedemann, J.; Aussereur. zweifl. Insekt; vol. I, p. 548; (Limnobia); 1828. 
§ Fabricius, J.; Syst. Antliar.; p. 31; (Tipula); 1805. 
10 Osten Sacken, C. R. R.; Biologia Centr. Americana; Dipt.; vol. I; p. 10; 1886. 
