SIMULIIDAE OF AFRICA 39 



bluish grey bloom seen from in front, finely and inconspicuously pale scaled 



EDWARDSELLUM Enderlein (p. 101) 



- Hind tarsus entirely black without contrasting pale base. Gonapophyses bluntly 



rounded lobes, not at all produced. Spermatheca without internal hairs. Scutum 

 thickly brilliant pale yellow to deep golden scaled, sometimes with bronze- 

 coppery scales medially, no trace of such bloom PHORETOMYIA sgen. n. (p. 79) 



7 Gonapophyses forming pointed subtriangular or slender attenuated processes 



(Text-figs. 158-161). Claws simple or with minute basal tooth (Text-fig. 83). 

 Pleural membrane often haired ... ...... 8 



- Gonapophyses forming short bluntly rounded or truncate lobes (Text-figs. 156, 157). 



Claws usually with very large basal tooth (Text-figs. 78, 79). Pleural membrane 



bare (except in adersi) ........... 10 



8 Gonapophyses forming rather large clasper-like processes directed towards each 



other and strongly haired apically (Text-fig. 161). Paraprocts slightly attenuated 

 ventrally. Seventh abdominal segment with distinctly formed brownish sclerot- 

 ized sternite. [Malagasy Region only] . . XENOSIMULIUM sgen. n. (p. 86) 



- Gonapophyses not of this form. Paraprocts not produced downwards. Seventh 



abdominal segment with distinct sternite, pale and membranous ventrally [not 

 known from Malagasy Region] ......... 9 



9 Gonapophyses forming longnarrowacuminateprocesses, usually curled (Text-figs. 159, 



160, 162). Scutum normally with a lyrate dark pattern (of type shown in Text- 

 fig. 72), sometimes only visible from in front in certain lights. Spermatheca with 

 internal hairs. Claws simple . . . METOMPHALUS Enderlein (p. 96) 



- Gonapophyses short subtriangular with tips slightly pointed and directed slightly 



inwards (Text-fig. 158), inner margins concave. Scutum without definite 

 pattern. Spermatheca without internal hairs. Claws with very small basal 

 tooth or sometimes almost simple . . . ANASOLEN Enderlein (p. 88) 



10 Claws with large basal tooth (Text-figs. 78, 79) (except in speculiventre from Sey- 



chelles). Small forms, wing-length usually 1-8-2-8 mm, hind tibiae usually 

 with sub-basal dark band and legs extensively pale, body scaling usually silvery 

 yellow or silvery. [Pharate females not attached to other arthropods] . . 11 



- Claws with very small or minute basal tooth, sometimes virtually simple (Text-fig. 



80). Larger forms, wing-length 2-7-3-6 mm, legs usually entirely black and hind 

 tibiae therefore without sub-basal dark band, body scaling brilliant pale yellow 

 to deep golden. [Pharate females attached to crabs or mayfly nymphs] . . 12 



1 1 Abdominal tergites 6-8 bare except for sparse fine inconspicuous hairing and semi- 



shining black (except fully pale scaled in mevops and evillense) 



POMEROYELLUM Rubzov (p. 66) 



- Abdomen evenly and thickly covered with pale scales, not almost bare and 



shining on terminal segments 



EUSIMULIUM Roubaud (p. 55), MEILLONIELLUM Rubzov (p. 74) 



12 First two abdominal segments thickly covered with brilliant pale yellow to deep 



golden scales and strongly contrasting with remainder of abdomen which is black 

 with coppery brown scaling, and at most has only scattered yellow scaling later- 

 ally. [Pharate $ attached to mayfly nymphs] PHORETOMYIA sgen. n. (part) (p. 79) 



- Abdomen rather thickly and evenly covered with pale yellow to golden scales, some- 



times with dark coppery scales in addition, not therefore strongly contrasting in 

 appearance between basal segments and remainder of abdomen*. [Pharate $ 

 attached to crabs] . ..... LEWISELLUM sgen. n. (p. 76) 



13 Basal section of radius haired. Cibarium unarmed ...... 14 



- Basal section of radius bare. Cibarium armed with minute denticles or granulations 



between the cornuae ........... 15 



14 Claws simple, very enlarged (Text-fig. 84). Pleural membrane haired. Gona- 



See Appendix 



