254 PROF. A. D. IMMS ON A NEW SPECIES OF 



anterior (front) seta {f.s. in fig. 7) as long aSj or a little longer than, the 

 smaller claw, and very stout and spine-like. The last pair (twelfth) of 

 leo-s with a slender elongate tarsus, five times longer than deep. The 

 setge along the anterior dorsal margin of the tibia, metatarsus and tarsus 

 are moderately long and prominent ; the tibia with four such setse, the 

 metatarsus with five and the tarsus with seven. The exopod (ex. in fig. 8) 

 very nearly as long as the depth of the metatarsus at its widest part. The 

 anterior claw is long and tolerably slender ; the other claw is also slender, 

 strongly curved, and measures '6 of the length of the anterior one. The 

 front seta is much less strongly developed than that on the first pair of legs. 



Cerci (fig. 10). — The length of the cercus is four times greater than the 

 depth across the widest part. They are covered with short stout setse, 

 none of which is as long as half the depth of the cercus at the widest 

 part. The largest of the two apical or terminal setse longer by about one- 

 sixth than the depth of the cercus. 



Sensory Structures on the Last Segment (fig. 12). — These organs, which 

 have been variously referred to as modified vestigial legs, caudal papillae, &c., 

 do not appear to afford much value as a specific character. In the present 

 species each seta is very long and slender, being about three times as long- 

 as the sensory process itself ; the calicles are of the form commonly found 

 in Scutigerella. 



Remarks on allied Species. — S. sidmngidculata is closely allied to unguiculata 

 but differs from it in the following characters. Out of nearly fifty examples 

 of the latter species examined by Hansen, the variation in length is only 

 3 to 3* 6 mm. and the number of antenual joints varies only from thirty 

 to thirty-four. The sinus on the posterior margin of the thirteenth 

 (penultimate) scutum is not so strongly marked as in S, unguiculata. 

 Furthermore, the anterior claw on the last pair of legs is not quite so long 

 and slender as is the case in the latter species, and is intermediate in this 

 respect between it and S. caldaria, Hansen. The species is easily dis- 

 tinguishable from S. caldaria from the fact that the setse, in the central 

 whorl on the joints of the antennse, are long and stout and equal in size 

 on both the upper and lower aspects. S. orientalis, Hansen, is closely allied 

 to S. suhunguiculata, but is separable from it on account of possessing a 

 shorter and stouter anterior claw to the last pair of legs, and a smaller 

 expedite to the legs. 



Our knowledge of the Symphyla has been greatly extended and placed 

 on a sound basis by Hansen^s admirable memoir * on the order. In that 

 work six species are described and recorded from Asia, but none of them 

 have been found in India, and only one up to the present is known from 

 the mainland, viz., Scutigerella orientalis from Bangkok. It is also known 



* Quart. Joum. Mic. Sci., vol. xlii, 1904, pp, 1-101, pis. 1-7. 



