No. 6. — Results of the Yale Peruvian Expedition of 1911. — The , Arachnida. By Ralph V. Chamberlin. The arachnids, upon a study of which this paper is based, were collected for the most part by Prof. H. W. Foote while a member of the Yale Peruvian Expedition of 1911. The collection has proved to be extraordinarily interesting, presenting a very large proportion of previously undescribed forms among which are eighty -two new species and twelve new genera. A few specimens were secured at Panama; but aside from these, the material all comes from localities in a little known section of southeastern Peru at elevations ranging from 3,000 to 11,500 feet above sea level. Comparatively few of the species seem to be identical with forms recorded from more northerly locali-ties of Peru by Taczanowski in his Les Araneides du Peru (Bull. Soc. nat. Mosc. 1878, 53, p. 278-374; Horae Soc. entom. Ross., 1878, 14. p. 140-175; 1879, 15, p. 102-136). Some of the localities mentioned are not on published maps. This collection of arachnids was turned over to the author for study through the kindness of Professor Foote, who has also consented that the entire lot remain the property of the Museum of Comparative Zoology. Prof. A. Petrunkevitch of Yale had planned to report upon the collection but the press of other duties prevented. He had made notes and drawings of several species which were kindly sent to me. The principal Peruvian localities from which the arachnids of the collection come with elevations and months during which specimens were secured are as follows : —
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