90 PROF. A. D. IMMS OX 



Coloration. — When alive dull reddish with a purplish tinge. 

 In alcohol specimens dull biick-red, with the head paler and 

 inclining to yellowish. Theantennse and legs dark purplish ; the 

 furcala white. The eyes on a black patch on each side of the 

 head, the two eye-patches united together by a ti'ansvei'se black 

 band situated just behind the points of origin of the antennae 

 (fig. 19). 



Length r25-l-5 mm. 



Five specimens taken under stones along the edge of a 

 mountain stream at Badrinath, Garhwal Himalaya, 10,300 ft. 

 [A. D. Imms, May 27th, 1910). 



No. -rT° Indian Musevim Coll. 



10 



ISOTOMA NIGROPUNCTATA, sp. n. (PI. YII. figS. 27-29.) 



Seiosa. Segmentum quartum ahdominis fere triplo longius quam 

 tertiivm. Ocelli 4 : 2 in utroqzie latere capitis. Denies furculm 

 vianuhrio longio7'es ; mucrones ti'identiculati. Long. l"5-2 mm. 



Head. — The ei/es two in number on each side, placed one behind 

 the other. The p>ost-ante7inal organs very small, annular (fig. 27). 

 Situated on the dorsal aspect of the head are large curved setae, 

 ciliated along one side at their apices. 



Antennce. — Slightly longer than half the total length of the 

 head and trunk ; the joints related to one another in length as 

 3:6:6:11. 



Trunk. — The segments related respectively in length as 6 : 5 : 

 3:4:5:13:3:1. A prominent "collar" of setae along the 

 anterior border of the mesothorax, similar to those occurring on 

 the head. A few scattered setas over the general surface of the 

 body, and a tuft of plumose hairs at the apex of the abdomen. 



Legs. — The claws of the feet similar on each pair of legs 

 (fig. 28). The superior claiv slender, strongly curved and acumi- 

 nate ; armed with one large tooth towards the base, and a 

 minute tooth immediately in front of the latter. The inferior 

 claiv linear and acuminate, unarmed. No tenent hairs ; in the 

 position occupied by them is a slender tapeilng seta. 



Furcida. — Slender, the dentes related in length to the onanu- 

 hriiim as 5 : 4. The mucrones (tig. 29) tridentate, armed with a 

 slender curved terminal tooth, in front of the latter is a shorter 

 and stouter vertical tooth, and at the base of the mucro is a slender 

 backwardly directed spiniform tooth. Arising from the dens, at 

 a distance from the apex equal to three times the length of the 

 mucro, are several long compound (plumose) hairs. These extend 

 backwai-ds, parallel with the long axis of the fvircula, reaching 

 nearly to the apex of the mucro (fig. 29). 



Coloration. — Straw-coloured wdth a slight brownish tinge; 

 the legs and spring whitish. When viewed under an ^ in. objective 

 deposits of fine brown gi-anules are seen beneath the cuticle, and 

 to these the brownish tinge owes its origin. The deposits are 

 for the most part arranged segmentally in ti'ansverse bands. The 



