194 PROCEEDINGS OF THE ACADEMY OF [April, ARACHNIDA FROM COSTA RICA. BY NATHAN BANKS. During the past few years the writer has received large series of spiders and daddy-longlegs from Costa Rica for identification. Most of these were collected and sent by Prof. J. Fid. Tristan, of San Jose. For a few years the late Dr. Paul Biolley sent me several lots, but soon turned the whole matter over to Prof. Tristan. Most of the specimens were collected at or near San Jose, but there are a con-siderable number from the Pacific slope of the country. The majority of the species are of course already recorded by the Biologia CentraU-America, but about 70 species are new and about 20 more not treated in that work. A few species recorded from Costa Rica in the Biologia are not in the collections sent me. Many of the Costa Rican records in the Biologia, are based on collections from Dr. Biolley and Prof. Tristan, although not expressly so stated in that work. The collection is similar to most tropical collections of spiders — a large number of Attidse, Epeiridse, and Clubionidse, few Drassidae and Thomisidse. The number of Phalangida is truly remark-able. The web-building species show a considerable number that also occur in our country, but of those not building webs there are very few that extend into our borders. About seven or eight are species commonly found in houses in the tropics of America. Altogether there are 288 species, 65 of which are Epeiridse, 48 Attidse and 33 Phalangida. Records without any name are all from Prof. Tristan; elsewhere the collectors are given, "B. and T. " signi-fying "Biolley and Tristan." Some species were collected by Mr. Picado; a few by Messrs Lankester and Maxon. THERAPHOSID^]. Eurypelma longipes Cambridge. Biol. C. Am. Arachn. Aran., II, 21, 1897. Machuca. Eurypelma seemanni Cambridge. Biol. C. Am. Arachn. Aran., II, 26, 1897. Atenas, August (Picado), and Pozo Azal de Pirris (Pac), 150 m., April (Biolley).