Carpentkr — The Apterijgota of the Seychelles. 11 



In distinguishing genera, Escherich lays great stress on the nature and 

 arrangement of the bristles, which are unfortunately often knocked off in 

 preserved specimens. The scars marking their points of insertion are, how- 

 ever, usually conspicuous. 



Lepisma Linne. 



This, the best-known genus of the family, has the little liousehold 

 European "Silver -fish," Lcpismci snccharina Linn., as its type species. In 

 the collection from the Seychelles the genus is represented by a single 

 myrmecophilous species, which is apparently new. A number of Lepismae 

 from various regions are well known as guests of ants and termites. 



Lepisma intermedia sp. nov. 

 (Plate V, figs. 67-70). 



Thorax moderately convex laterally, abdomen evenly narrowed behind ; 

 body about three times as long as broad. Feeler half as long as body. Eyes 

 small and round. Abdominal terga with two pairs of dorsal bristles. Tenth 

 abdominal tergum twice as long as ninth, sinuately emarginate behind. 

 median tail process three times, cerci twice as long as tenth tergum (fig. 67). 

 Ninth sub-coxa with inner process only slightly longer than outer (fig. 68). 



Length 3-4 mm. Colour of scaling deep brownish violet dorsally, ventral 

 surface, feelers, legs, and appendages generally pale yellow. 



Localities. — Mahe : Long Island, from a nest, in decayed log, of Phcidole 

 pwnctidata, an ant known in both Africa and Madagascar (July, 1908, three 

 specimens). Felicite (1908, two specimens). 



Unfortunately all the specimens of this little Lepisma are dry and carded, 

 so that it is not possible to make out many structural details. The legs 

 have rather wide shins (fig. 69), and feet with the first and third segments 

 each slightly longer than the second. The sliin bears at its outer tip the 

 broad spur commonly found in this family, and some flattened sensory 

 bristles (fig. 70) feebly hooked at the tip. L. intermedia comes nearest to 

 L. Braunsi Escherich (from South Africa), and L. indica^ lllsclierich ('04, 

 pp. 50-51), dittering by its smaller size, relatively longer median tail-process, 

 and shorter inner ninth sub-coxal processes. It resembles L. Braunsi in its 

 emarginate tenth tergum, and L. indiva in its round eyes. 



Isolepisma Escherich. 



This genus was established by Escherich ('0 4, pp. 61-2) for a single 



wide-ranging tropical species in the description of which no clear indication 



is given of what are considered generic as contrasted with specific characters. 



Now that a second species has to be described, it is possible to give a more 



precise diagnosis of the genus. 



[C21 



