. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 386 bulletin: museum of compakative 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, 319, Tabaconas, near Huanca- bamba, Peru, August, 1916. G. K. Noble. Rdali
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 386 bulletin: museum of compakative 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, 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. earneranoi. 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. tu
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