Carpentkr— The Apterygota of the Seychelles. 47 



group has lately been published by Bonier ('13 a). The great majority of 

 the knowu species belong to the widespread genus Cyphoderus Nicolet, in 

 which must be placed the only representative of the group in the Seychelles 

 collection. 



Cyphoderus Nicolet. 



This genus is characterized by the normal build of the head and the foot- 

 claw (except for the excessively long basal tooth, see fig. 72 J), the presence 

 of a very elongate lamella (fig. T2lm) on ihe empodial appendage, eleven 

 elongate scales (an inner row of five and an outer row of six), on the dens, 

 and usually the great length of the mucro in proportion to the dens. 



Cyphoderus insularum sp. nov. 

 (Plate XVII, figs. 71-73.) 



Feeler half as long again as head, relative length of segments as 

 2:5:3:6 (fig. 71). Foot (fig. 72) with stout tenent hair, the claw with 

 slender basal tooth (J), proximal teeth hardly apparent ; empodial appendage 

 {em) long, sharp, and curved, with acute basal lamella (/m). Spring half as 

 long as body ; manubrium slightly longer than dens and mucro together ; 

 dens half as long again as mucro (fig. 73), which has a small upturned apical 

 tooth and two stout dorsal teeth. Inner distal scale of dens (fig. 73 sc) 

 from two-thirds to four-fifths the length of mucro. 



Length 1 mm. (Jolour white. 



Localities. — Praslin : Vallee de Mai, " swarming among termites — probably 

 Arrkinotermes canalifrons (Sjost.) — in fallen log" (December, 190S). Mahe : 

 Cascade, 1000 feet (three specimens, 190iS). 



In the form of the mucro and its proportion to the long dental scale this 

 species resembles C. hidenticulatus, Parona (see P>6rner, 13a, p. 277), inhabiting 

 ant and termite nests in Italy and South Africa : as well as C. tcrmitum 

 Wahlgren ('06, pp. 19-20), a termitophile from the Sudan, and (still more 

 closely) C. genneserae, Carpenter ('13), from a salt spring near Tiberias. In 

 the Seychelles insect, however, the mucro is of excessive length as compared 

 with the dens. As regards the structure of the foot-claw, G. insularum is like 

 the European C. albinos Nicolet in the absence of internal teeth. 



NOTE. 

 A full set of the specimens described in this paper is deposited in the 

 British Museum (Natural History). A large number of duplicates are in 

 the Cambridge University Museum, and some— through Prof. Gardiner's 

 kindness — are in the National Museum. Dublin. 



