652 MR. A. D. MICHAEL ON THE [DeC. 1, 



tooth. There is a single small tooth just behind this. Movable 

 arm nearly straight on the inner edge, with a large, strongly-curved, 

 terminal tooth, and a smaller recurved one a short distance behind 

 it. This arm has a long, slender, round, and undulated accessory 

 piece on its outer side, which projects considerably beyond the rest 

 of the chela. Epistome (fig. 7 b) rounded, serrated with small 

 teeth. The dorsal surface is set with smallish, spine-like hairs, 

 at almost regular intervals (about 25 to the millimetre). 



The under surface of the female has the plates arranged similarly 

 to those of LfElaps cuneifer. The legs are sharply bent at the 

 femora, which makes the measurements of them rather imperfect, 

 they are also much curved ; the second and fourth pairs are 

 considerably thicker than the first and third, especially in the male. 

 The tarsi of these legs in the male end in a curious human-foot-like 

 turn, most marked in the fourth leg. The femora of these two 

 legs have two somewhat wedge-shaped hairs on their outer side, the 

 other hairs are mostly fine spines. No apophyses to any leg ; all 

 legs terminated by claws and caruncles. 



Hab. Found in the nests of Camponotus herculeanus (probably 

 race ligniperdus), near Innsbruck, Tyrol. Rather common. 



ACUTA, n. sp. (Plate L. figs. 8-8 h.) 





2 



d 



millim. 



millim, 



Length, about •/! 



•56 



Greatest breadth, about "46 



•32 



Length of legs, 1st pair, about . . "62 



•52 



„ 2ud „ „ . . -42 



•36 



„ 3rd „ „ .. -40 



•37 



„ 4th „ „ .. -70 



•61 



Colour lightish chestnut. 



Texture fully chitinized, highly polished. With a highish power 

 and a strong light it is seen that the dorsal surface is marked out 

 by very fine lines into irregular, mostly hexagonal or pentagonal, 

 divisions averaging about 25 to the millimetre across the body, and 

 about 50 to the millimetre in an antero-posterior direction. No 

 other markings. 



Shape rather narrow anteriorly, more truncated or rounded pos- 

 teriorly ; the sides markedly curved, widest a httle in front of the 

 middle. Moderately arched on the dorsal surface. 



Mandibles of the male (fig. 8 a) very singular ; fixed arm of the 

 chela of the ordinary type, rather straight, with a short, sharp, re- 

 curved termination, two other teeth not large. The movable arm 

 is much the larger, nearly twice as long as the fixed arm, and much 

 broader ; it has a large and a small tooth, near together, about the 

 middle, and a long and sharp upwardly curved end ; what appears to 

 be a small channel or duct runs almost its whole length in the inte- 

 rior. No accessory piece. Epistome (fig. 8 b) rounded, dentate, the 

 middle teeth considerably the longest. " The dorsal surface is set 



