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XXI. On the Geometridaz of Tropical Africa in the National 



Collection. By CoLONEL CHARLES SWINHOE, 



M.A., F.L.S., etc. 



[Read June 1st, 1904.] 



Very little work has been done with the Geometridse of 

 Tropical Africa. This paper is merely an attempt to lay a 

 foundation for future workers ; very much more material is 

 necessary than has been at my disposal, before any decision 

 can be come to as to the sub-division of the African genera ; 

 many of them are very abnormal ; the Genus Terina used 

 to stand in the family Nyetcmcridm (Deilemerinas) as also 

 did Aletis and Pitthca; the last-named is a true Boarndd 

 about which there can be no mistake ; Terina and Aletis I 

 have put in the Orthostixinie ; I submitted examples of the 

 latter to Mr. Meyrick and to Mr. Warren, and they both 

 agree that that is its right place ; amongst the Sterrhidse 

 there are apparently several good sub-genera in the 

 Grasped ia group, all of them so exactly resembling each 

 other in coloration and pattern as to be indistinguishable 

 from each other except by their anatomical characters ; in 

 one species of Pisoraca, the type of which is an African 

 insect, only the hind femora are clothed with curled hairs, 

 but in other species, though they are true Pisoraca in so 

 far as the spur of the hind-tibia is concerned, the hind- 

 tibia is also clothed on the inner side with a dense brush 

 of hairs, which almost conceals the single spur; naany 

 African Larentiinx have vein 5 of the hind-wings well 

 above the centre of the discocellulars. 



I have added to this paper a list of species not in the 

 National Collection, and I have tried to include every 

 species published up to date, as it will be of very great 

 help to those that come after me ; I have not included 

 any species confined to South Africa because Sir George 

 Hampson is working out the Heterocerous Fauna south of 

 the Zambesi. 



TRANS. ENT. SOC. LOND. 1904. — PART III. (SEPT.) 



