264 PROCEEDINGS OF THE AMERICAN ACADEMY. 



pering and curving, uuidentate one third from the apex ; inferior claws 

 half as long, lunate, acuminate ; tenent hairs, two on the fore feet and 

 three on the others. Dentes stout, slightly tapering, with stout reclinate 

 satEe and a few extra long bristles ; mucrones a third as long as the 

 dentes, in form as represented in Figure 12. Anal spines (Fig. 13) two, 

 small and conical. Length, 1.5 mm. 



Described from twenty-four types, from Yanaka, Tokyo, November 

 18, 1894. 



This species closely approaches the European A. purpurascens Lubb., 

 as well as A. theelii Tull. of Nova Zembla, both of which species I have 

 received from Dr. Schiiffer ; from these A. gracilis is distinguished espe- 

 cially by the form of the mucrones, together with the coloration. 



Fam. ENTOMOBEYID^. 



Genus Isotoma Bourl. 



Isotoma nitida, n. sp. 



(Plate 1, Figs. 14-18.) 



Bluish gray, with a slight greenish tinge ; antennjc darker ; sides mot- 

 tled with pale spots ; sternum pale. Head, body, and appendages clothed 

 with short dense bristles (Fig. 14) ; genje gibbous. Eyes (Figs. 15, 16) 

 eight on either side, upon black patches ; postantennal organ absent. 

 AntennjB two fifths as long as the body, stout, with segments related in 

 lenf th as 2 : 4 : 4 : 5, and with the last three segments petiolate. Supe- 

 rior claws (Ficr. 17) broad basally, slightly curved, untoothed, with two 

 filiform pseudonychia ; inferior claws broadly lanceolate, without teeth ; 

 tenent hairs absent. Furcula slender, exceeding the ventral tube, with 

 segments related as 4 : 16 : 1 ; mucrones (Fig. 18) four-toothed. Length, 

 1.4 mm. 



Described from seventy-two types, of which seven were collected at 

 Komaba, Tokyo, November 16, 1894, and the remainder at Miyagi, 

 Boshyu, November 9, 1895, 



This species is, upon the whole, most nearly allied to 1. pahistris Miill., 

 especially in the form of the mucrones (cf. Schott '93, Taf, 6, Fig. 5). 



T find no species of Isotoma, except that now described, which possesses 

 filiform pseudonychia. 



