CAKPHNTi'iR — The Apterygota of the Seychelles. 21 



species /. solifiyns. During recent years a large number of species have been 

 described from various parts of the world, ranging from the Mediterranean 

 countries and the United States to New Zealand and Chile. It is not 

 surprising, therefore, to find the genus represented in the Seychelles 

 collection. 



lapyx Haliday. 



lapyx silvestris sp. nov. 



(Plate XI, figs. 121-134.) 



Feelers 25-28 segmented. Legs somewhat slender; foot four-fifths 

 length of shin, bearing two slightly curved claws, with feeble tooth on 

 inner edge, and a short empodiuni (fig. 121). First abdominal sternum of male 

 (fig. 126) with a small median rounded projection on the hinder edge, and 

 a pair of vesicles, over whicli are two " comb "-series of small sharp bristles. 

 Sixth abdominal terguni evenly rounded behind ; seventh with the hind 

 corners very slightly produced ; tenth distinctly longer than broad (fig. 127). 

 Forceps nearly as long as tenth segment; slightly asymmetrical, with the 

 tips of the corci strongly turned inwards, and the right internal tooth nearer 

 the base than the left (figs. 127, 134). 



Length 7 mm. (colour varies from whitish to chestnut in different 

 specimens — all apparently adult. 



Localities. — Mahe : Foret Noire, at and over 1,000 feet elevation (5 

 specimens, both sexes, 1908j. Silhouette (4 males, 1908). 



This species is remarkable for the comparatively small number of 

 antennal segments. In Verhoeff's synopsis of the genus ('04) no species with 

 less than thirty segments in the feeler is mentioned. According to Silvestri 

 ('08a, p. 389) the true /. solifwgus Haliday has twenty-eight, while /. anodus 

 Silvestri ('05, pp. 788-9) from Chile, has only twenty-seven. The latter, 

 however, may be readily distinguished by the relative thickness of its legs, 

 and the absence of internal teeth on the forceps, from the Seychelles insect. 

 From I. solifugus, the species now described differs markedly in the armature 

 of the first abdominal sternum as well as in the comparatively broad and 

 blunt processes at the hind corners of the seventh tergum. /. silvestris is 

 remarkable in apparently possessing only one " auditory " bristle beneath 

 each of the three antennal segments (fourth, fifth and sixth), which usually 

 carry three or four such structures (fig. 124). 



From comparison of the specimens in this colleci,ion it appears that the 

 feelers of lapyx are capable of a liigh degree of contraction and extension. 

 All the individuals from Mahe had the feelers presenting the appearance 

 shown in fig. 121, while in two of the Silhouette specimens they were very 



