292 J&GIDM. 



faire une description specifique." The posterior segment 

 of the tail is in fact destroyed, but the remainder of the 

 body sufficiently proves its complete distinction from any 

 other known British species. It is more elongate in 

 form than the species of ./Ega, and the two basal joints 

 of the upper antennae are thin and subcylindric, inserted 

 beneath the conically anteriorly produced middle of the 

 anterior margin of the head (the flagellum is destroyed). 

 The lower antennae are nearly one- third of the length 

 of the body, with a stout flagellum, consisting of about 

 thirteen articulations. They are inserted close together, 

 and not separated by a ridge or scutcheon-shaped piece. 

 The eyes are of large size, converging above and nearly 

 uniting in front ; each eye consists of nine rows of 

 facets, the middle or longest row containing thirteen 

 lenses. The palpiform appendage of the mandibles is 

 slender and three-jointed, the second joint thickened at 

 the tip and furnished with ten setae set on at right angles ; 

 the terminal joint is about two-thirds of the length of 

 the middle one, and terminated by a strong bristle, and 

 about seventeen short setae on its inner edge. The 

 lateral margins of the segments of the body (especially the 

 three posterior) are prominent and distinct, each being 

 produced behind into a sharp point (our upper left-hand 

 figure L to Q represents the four posterior segments of the 

 body and the two anterior ones of the tail seen laterally). 

 The terminal segments are traversed with a slightly ele- 

 vated carina ; the legs are rather longer than in the species 

 of ^Ega; the three anterior pairs are strong, with the 

 hand and wrist armed with a few 7 short strong spines, and 

 the finger unguiculated, having the base dilated so as 

 almost to resemble a separate joint. The tail is as wide 

 as the body ; the anterior segment is narrower than the 

 following, and very short, the sides ending in acute spines ; 



