Carpenter — The Apterygota of the Seychelles. 35 



tion. The tribes and genera comprised in the Seychelles fauna may be 

 distinguished thus : — 



A. Sixth abdominal tergum elongate and cerciform, feelers with six 



segments, the two distal ringed, .... Hdcromiiricini. 



including one genus, Heteromimcus. 



B. Sixth abdominal segment normal, not elongate. Feelers with the 



four segments all unringed. 



i. Dentes of spring tle.Nible, with dorsal edge corrugated, 

 mucro relatively short and slender, with dorsal and 

 terminal teeth and a dorsal spine, . . Entomohryini. 

 in. Body unsealed, .... Entomohnja. 



n. Body scaled. Mesonotum prominent. 



0. Dentes of spring without spines, Lepidocyrtvs. 

 p. Dentes of spring with spines, . Acanthurella. 

 ii. Dentes of spring rigid, without corrugations along dorsal 

 edge. 



q. Mucro of spring relatively short and 



broad, ...... Paronellini. 



s. Body scaled, feelers shorter 

 than body, dentes with 

 spines, .... Microparonella. 



t. Body unsealed, feelers longer 



than body, dentes \xn?,^mQA,Gremastocephcdus. 

 r. Mucro of spring elongate — usually a 

 third or a quarter as long as dens, 

 which carries series of large ribbed 

 scales, ...... CyphocUrini. 



genus, Cyphodenis. 



IIETEROMUlilCINI. 



Heteromuricus Imms. 



This remarkable genus was established by Imms (12, p. 92) for a species 

 H. cercifcr, found under dead leaves at Calcutta. The name was given on 

 account of the conspicuous tail-process at the hinder end of the abdomen ; 

 this, however, appears not to be a " median cercus," as Imms suggested, but 

 the elongate tergum of the sixth abdominal segment. Imms has referred 

 this insect to a new sub-family, the Heteromuricinae, intermediate between 

 the Tomocerinae (seemingly unrepresented in the Seychelles fauna) and the 

 Entomobryinae. He suggests, however, its probable affinity with Heteromurus 

 (Waukel), which is regarded by most recent students as a member of the 



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