386 



bulletin: museum of compakative zoology. 



Fig. 2. 

 dible. 



Peripaliis peruvianus Brues. M;in- 



Mandiblcs. (Fig. 2.) The mandibles have two well-developed 

 accessory teeth and a less prominent but more heavily chitinized 



third one. The blade bears 

 seven or eight denticles, the last 

 two or three of the series much 

 smaller in size. 



Type. M. C. Z. 314. De- 

 scribed from the type, three fe- 

 male paratypes, M. C. Z. 315- 

 317, and two males, M.C.Z.318- 

 319, Tabaconas, near Huanca- 

 bamba, Peru, August, 1916. G. 

 K. Noble. 



Rdalionships. The present 

 .lorm is quite closely similar to 

 several others already known 

 from Ecuador and western Co- 

 lombia, and finds a place in the 

 group of species from this region, the members of which ha^'e been 

 carefully studied and described by Bouvier (Ann. sci. nat. Zool., 1907, 

 ser. 9, 2, p. 80-119). It is, however, readily distinguishable from all 

 of them by anatomical characters, and must I think rank as a species 

 rather than as a subspecies, particularly as it is difficult to associate 

 it with any single described form to the exclusion of others. 



By the alternation in width of the body-folds, the presence of five 

 pedal papillae on some of the legs and the large number of legs, P. 

 pcruviunus falls at once into the group which includes P.^'cuaddrcnsis, 

 P. lankesteri, P. tuberculatus, P. quifciisifi, and P. earner anoi. 



P. eeuadorensis is at once distinguished from all the others including 

 the present new species by the absence of segmentally arranged in- 

 complete dermal folds. It differs from P. perurianus also by its more 

 numerous legs and by the fact that smaller dermal papillae are much 

 more numerous between each pair of large papillae. P. lankesteri is 

 more difficult to separate from E. peruvianus, but in the arrangement 

 of the integumentary papillae is very different. The former possess 

 numerous accessory papillae which are almost entirely absent in the 

 latter. P. tuhereulatus has the accessory papillae more numerous and 

 is consequently less like P. peruviaim^ in this respect, it differs also in 

 possessing the rudiment of a sixth creeping pad on the foot and the 

 presence of only four pedal papillae on all the legs. P. quifensis has 

 not been very accurately described (ef. Bouvier, t. c, p. 110), and 



