NEW NASAL MITES PTILONYSSUS AND PARANEONYSSUS (Acarina: Mesostigmata), FROM TAIWAN AND NEW GUINEA

Paraneonyssus pericrocoti is described from Pericrocotus roseus divaricatus in Taiwan and Ptilonyssus wilsoni from Collocalia sp. in New Guinea. The following new species of nasal mites from Taiwan and New Guinea were collected for Bishop Museum in the course of an intensive survey of ectoparasites of Taiwan birds made by T. C. Maa, and in the course of general surveys of vertebrate ectoparasites in New Guinea. Paraneonyssus pericrocoti Sakakibara, new species Figs. A-E. Diagnosis: 2 large dorsal plates; podosomal plate broadly rounded anteriorly, posterior margin with 2 deep grooves; opisthosomal plate divided into 2 parts. In dorsal profile, slightly constricted above coxae IV. £ . Body: Idiosoma 115 /JL long, 325/* wide. Dorsum: Podosomal plate rounded anteriorly, 235 ju long, 225 ju wide, posterior margin undulate with 2 deep grooves, with 10 pairs of minute setae. Opisthosomal plate longer than wide, 350 ju long, 150 ju wide, a line, but not a distinct separation, sets off the Pygidial area from the rest of the plate, with 4 pairs of minute setae, including the pygidial. Two pairs of setae posterolateral to podosomal plate, pair of setae lateral to the plate. Eight pairs of minute setae lateral to opisthosomal. Two pairs of posterior setae longer than the other 7 pairs. Peritreme including stigma 30 ju long. Venter: Sternal plate 143 ju long, 99 ju wide, rounded anterior and posterior margins, with 3 pairs of sternal setae on plate. Genital plate 125 ju long, 98 ju wide, posterior margin rounded, 1 pair of minute genital setae. Anal plate 100 ju long, 70 ju wide, somewhat pear-shaped, with cribrum. Anus centrally placed, surrounded by 3 subequal anal setae, of which paranals lie level with anterior of anus. Ventral cuticle with 5 pairs of small setae, 3 pairs between genital and anal plate, 1 pair lateral of anal plate. 1. This investigation was carried out under the project "South Pacific Insects of Public Health Importance" supported by a grant to Bishop Museum from the National Institutes of Health (AI 01723). 598 Pacific Insects Vol. 9, no. 4