238 BRITISH GUIANA TIPULIDAE 



19. Postnotum and scutelluin black [front black, leniainder ot the head 



reddish; wings hyaline, rather narrow, stigma small, brown, 

 bisected by cross-vein r, cord slightly clouded with brown; hal- 

 teres brown; abdomen metallic black with the incisures reddish 



yellow] . (Mexico) gracilis Osten Sacken" 



Postnotum brownish black, scutellum light yellow [head reddish; 

 pronotum yellow; hind coxae dark; wings hyaline with a con- 

 spicuous brown spot at the base, the tip infuscated; abdomen 

 dark brownish black with the tergal apices yellow]. (Peru) 



hilaris Alexander^^ 



20. Head black not metallic; thoracic dorsum with the color mostly black, 



shining ■• 21 



Head generally not black, if so with metallic reflections; the thoracic 

 dorsum with the color largely yellowish or reddish with or without 

 scanty darker markings 25 



21. Legs brownish black , 22 



Legs with the femora yellow, tipped with brown, the coxae brown ... 23 



22. Legs pitch black, coxae bright yellow; general color shining b'ack, 



the margin of the praescutum yellow; scutellum yellow; postno- 

 tum and pleura black, the latter with a yellow spot above the 

 mesocoxa and another under the wing-root [wings hyaline, 

 stigma blackish brown] . (South America) . morionella Schiner" 

 Legs dark brownish black; pleura black, unmarked [abdomen long 

 and slender; wings hyaline, the stigmal spot small]. (British 

 Guiana) lugubris, sp.n.»* 



23. A reddish mark on the humeral angles of the praescutum ; legs brown, 



fore femora yellowish with two brown rings. (Brazil) 



scapularis Macquart*^ 



The reddish on the praescutum not in the shajic of humeral marks; 



femora with only the apical brown annulus 24 



24. Pronotum dull yellowish; pleura uniformly black; wings infumed 



with brown, stigma dark brown, oval. (Peru) . tristis Alexander" 



Pronotum bright yellow; pleura with j^ellow spots; wings hyaline, 



stigma small, brown. (Mexico) molesta Osten Sacken"' 



25. Cross-vein r indistinct or lacking, tending to be oblique, the tip 



atrophied [color light j'^ellow throughout] . ^Brazil ) 



parishi .\lexander"* 

 Cross-vein r present, conspicuous, vertical 26 



21 1886. gracilis Osten Sacken, Biol. Cent. Am., Dipt., i, 7. 



22 1913. hilaris Alexander, Ent. News, xxiv, 443, 444, pi. 16, fig. 6. 



23 1868. morionella Schiner, Novara Reise, Dipt., 47 (Limnnbia). 

 2'* 1914. lugubris, sp. n., this paper, pi. iv, fig. 2. 



25 1838. scapularis Macquart; Dipt. Exot., i, pt. 1 , 73, pi. 10, fig. I {Rhnm- 

 phidia). 



26 i9i3_ tristis Alexander, Ent. News, xxiv, 439, 440, j)!. IG, fig. 1. 



27 1886. violesta Osten Sacken, Biol. Cent. Am., Dipt., i, 6, 7. 

 2» 1913. parishi Alexander, Psyche, xx, 46, 47. pi. 2. figs, c, k. 



