PROC. ENTOMOL. SOC. WASH. 86(4). 1984, pp. 808-820 FIVE NEW SPECIES OF ORCHESELLINI FROM CENTRAL MEXICO (COLLEMBOLA: ENTOMOBRYIDAE: ORCHESELLINAE) Jose A. Mari Mutt Department of Biology, University of Puerto Rico, Mayaguez, Puerto Rico 00708. Abstract.— FiYG new species of Orchesellini are described from specimens col-lected in five states of Central Mexico and in the Federal District: Orchesella quinaria, O. bullulata, O. impavid, Pseudodicranocentrus niger, and Dicranor-chesella seminuda. Pseudodicranocentrus circulatus is reported for the first time from the state of Morelos and a few details are added to its description. Forty-five figures complement the descriptions. Through the courtesy of Jose G. Palacios Vargas, Universidad Nacional Au-tonoma de Mexico, I have been able to study a number of Orchesellini collected by him and his colleagues in five states of Central Mexico and in the Federal District. The material includes six species, five of them new, distributed among three genera. Dr. Kenneth Christiansen, Grinnell College, Iowa, also lent me a specimen that was studied for the present contribution. Three new species belong to Orchesella, a Holarctic taxon that meets its southern limits of distribution in the Nearctic areas of Mexico. The genus was first reported from this country by Palacios Vargas (1981a, b) but no species determinations were made. The other three species belong in Pseudodicranocentrus and Dicranorchesella, genera endemic to Neotropical regions of Mexico. In only one instance, reported by Mari Mutt (1977) have species of Orchesella and Dicranorchesella been col-lected together. At Derrame del Chichinautzin, Morelos, Orchesella bullulata lives on the northern sections above 2150 m and two species o^ Pseudodicranocentrus occur on the southern slopes below 2100 m, but species of these two genera have not yet been found sympatrically. In the descriptions of the Orchesella species I have used the nomenclature system for the chaetotaxy of the third abdominal segment (Abd. 3) as proposed by Christiansen and Tucker (1977), and have adapted this system to the chaetotaxy of Abd. 2. Internal and posterior to the M group is found a macrochaeta which added to the median (M) group forms a median-posterior group (MP, Fig. 14). All the holotypes and most of the paratypes are temporarily deposited in my collection, some paratypes of all the species are deposited in the collection of J. G. Palacios Vargas, Laboratorio de Acarologia, Universidad Nacional Autonoma de Mexico, Mexico, D.F. I I
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