V 



A. D. MICHAEL ON A SPECIES OF GAMASUS. 267 



double-claw. There is a great apophysis with a bifid terminal 

 tooth and one single tooth on the inner side of third joint, with 

 a spike beyond it ; a smaller apophysis on the same side of the 

 fourth joint, with a spike behind it ; a still smaller apophysis on 

 the fifth joint ; and a narrow blade on the terminal part of the 

 tarsus. There are also a few rather strong hairs on the various 

 joints. The third and fourth tarsi end in sharp points, other- 

 wise these legs are not remarkable. There is a pair of spines 

 under each fifth and sixth, and three under the eighth joint, 

 one above the second, and three above the fourth joint, and 

 several fine hairs on all joints. 



Female. 

 Average length about 1*72 

 ,, breadth ,, "80 



,, length of 1st pair of legs 130 

 „ 2nd „ 1-00 



„ 3rd „ -91 



„ 4th „ 1-40 



Colour and texture as in the male. Form almost similar to 

 the male, but legs broad in proportion, and the anterior margin 

 more sloping, less shouldered. 



Body. — Epistome with one long, narrow central lamina, with 

 two paired teeth at the base (Fig. 14). Mandibles with both 

 limbs of the chelae of about equal length, crossing at their ends, 

 with about six teeth on each chela, provided with a semi-circle 

 of bristles as in the male. On the ventral surface (Fig. 17) the 

 sternal plate is divided into an anterior and a posterior (genital) 

 plate. 



Legs. — First pair without the axe-shaped projection ; second, 

 legs thickened, but not nearly so much so as those of the male ; 

 without apophyses, and the tarsi without the blades or the 

 terminal foot-like hooks. 



In other respects the female resembles the male. 



EXPLANATION OF PLATE XVI. 

 Gamasus terkibilis. 



Fig. 1. Adult male X 30. 



„ 2. Adult female X 30. 



,, 3. Mandible of adult male X 150. 



„ 4. Epistome (top of oral tube) of adult male X 100. 



