340 M. W. R. de V. GRAHAM 



2 (i) Eyes unusually large, touching or almost touching the posterior ocelli, sepa- 



rated by only half their length or less ; malar space from rather more than 

 one quarter, to nearly one third, the length of an eye ; eye-facets of unequal 

 size, those in the upper part of the eye larger than those of the lower part. 

 Ocelli in a nearly equilateral triangle. Legs with the knees black or only 

 very indistinctly pale. Antennal scape not strongly swollen ... 3 



- Eyes of normal size, separated from the posterior ocelli by fully the major 



diameter of an ocellus or rather more, the distance between the eyes about 

 equal to their length ; eye-facets of uniform size. Ocelli in a right- or 

 obtuse-angled triangle. Malar space fully one third the length of an eye or 

 somewhat more. Legs with the knees more or less distinctly testaceous. 

 Antennal scape sometimes swollen ....... 6 



3 (2) Antenna with fourth flagellar segment very much shorter and narrower than 



the fifth, less than half as long, without sensilla ..... 4 



- Antenna with fourth flagellar segment much larger than the third, at least 



slightly more than half as long as the fifth, with sensilla, and with bristles 

 arranged in two to three irregular rows ...... 5 



4 (3) Antenna with segments one to three of flagellum distinctly separated from 



each other, their combined length about three quarters that of the pedi- 

 cellus ; segment four not much larger than three, the funicle much as in 

 $ paludum (Text-fig. 278). Eyes 1-5 to 1-55 times as long as broad ; only 

 their upper half, or barely as much, with larger facets ; average diameter 

 of these large facets 23-25^1 ; upper part of eye with moderately short hairs. 

 Stigma of fore wing subtriangular, subsessile, fuscous microcera (Haliday) (p. 343) 



- Antenna with segments one to three of flagellum closely applied to each other 



as in conjungens (cf. Text-fig. 279), sometimes hardly distinguishable as 

 separate segments, their combined length less than half that of the pedi- 

 cellus ; segment four somewhat larger than three. Eyes 1-3 to 1-41 times 

 as long as broad ; at least rather more than the upper half, to rather more 

 than two thirds, of the eye has larger facets ; average diameter of these 

 large facets 28-33^ ; upper part of eye with extremely short hairs. Stigma 

 of fore wing sometimes petiolate, occasionally subcircular 



graminea Haliday (agg.) (p. 347) 



5 (3) Eyes moderately large, 1-35 to 1-5 times as long as broad ; the upper half, or 



hardly more, of the eye has larger facets than the part below this. Head and 

 thorax black with hardly any metallic tinge. Fore wing with stigma tend- 

 ing to be subtriangular (as in Text-fig. 272). Relatively smaller species, 

 length i-2 to 1-5 mm. ...... decipiens sp. n. (p. 342) 



- Eyes very large, only 1 • 15 to 1-25 times as long as broad ; the upper two thirds 



to nearly three quarters of the eye has larger facets than the part below this. 

 Head and thorax with a rather strong bluish to greenish tinge. Fore 

 wing (Text-fig. 271) with stigma tending to be subcircular. Relatively 

 large species, length 1-4 to 1-9 mm. . . . penetrans (Kirby) (p. 341) 



6 (2) Antennal scape not strongly swollen, at least rather more than three times 



as long as broad .......... 7 



- Antennal scape strongly swollen, only 2 to 2-3 times as long as broad . . 10 



7 (6) Antenna (Text-fig. 279) with fourth flagellar segment nearly as large as the 



fifth, the latter about 1-3 times as broad as long. Fore wing, Text-fig. 272 



conjungens sp. n. (p. 344) 

 Antenna (Text-fig. 280) with fourth flagellar segment much smaller than the 



fifth 8 



8 (7) Fore wing with basal cell with a large patch of hairs at its apex, on the upper 



surface of the wing. Head and thorax conspicuously metallic, green to 



