238 BRITISH (JUIANA TIPULIDAE 



19. Postnotum and scutelluin black [Iront black, loinainder of 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 gacken" 



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" 

 0. 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 pracscutum yellow; scutellum yellow ; postno- 

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

 mcsocoxa 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 pracscutum ; legs brown, 



foro femora yellowish with two brown rings. (Brazil) 



scapularis Macquart" 



The reddish on the praescutum not in the shape 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 yellow spots; wings hyaline, 



stisma small, brown. (Mexico) molesta Osten Sacken" 



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



atrophied [colorlight yellow throughout!. Hirazil) 



parish! .Alexander" 

 Cross-vein r present, conspicuous, vertical 26 



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



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



" 1868. morionella Schiner, Novara Reise. Dipt., 47 {Limnobia). 



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



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

 phidin). 



" 1913. trislis Alexander, Ent. News, xxiv, 439, 440, pi. 1(1, fig. 1. 



" 1886. molesta Osten Sacken, Biol. Cent. Am., Dipt., i, 6, 7. 



" 1913. parishi Alexander, Psyche, xx, 46, 47. pi. 2. figs, r, A-. 



