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F. W. EDWARDS — REVISED KEYS TO THE 



palpi. Patton's figure of the larval head of S. sugens certainly does not corre- 

 spond with the specimens sent by Dr. Ingram. Either Patton's drawing is 

 incorrect, or there are two allied species, or a mistake may have been made by 

 one collector or the other. It should also be mentioned that another very 

 different larva has been received as that of S. sugens, possessing a lateral 

 chitinous plate on the eighth segment, the edge of which plate is produced into 

 comb-teeth. These larvae formed the majority of a mixed lot collected in 

 Sierra Leone by Dr. J. Y. Wood, and forwarded for identification by Dr. J. H. 

 Ashworth. The adults bred by Dr. Wood were S. sugens and Uranotaenia 

 nigripes, but there were no £. sugens or Uranotaenia larvae amongst those which 

 were preserved. 



Genus Mansonioides. Theo. 



M. africanus (Theo.)." Fresh figures of this species are given, as those in 

 Dr. Ingram's papert were not sufficiently detailed. The larva has a rather close 

 resemblance to that of the North American Taeniorhynchus pertnrbans, Walk. ; 

 but the larva of no African species of Taeniorhynchus has yet been found. The 

 palpi are large, and, as in Aedomyia, they hang downwards. The strong curved 

 spines found at the tip of the siphon tube in both genera may indicate a relation- 

 ship. One striking peculiarity in this genus (seen also in Taeniorhynchus) is the 

 extraordinary development of the valves, which are specialised for attaching the 

 larva to its host-plant. 



Fig. 4.- — Aedomyia catasticta, Knab. 



* An examination of the male genitalia proves that M. africanus is after all quite distinct 

 from M. uniformis ; figures will be given later. Both species occur commonly in Africa. 

 f Bull. Ent. Res. Ill, p. 76 (1912). 



