[91] APTERYGOTA 89 



ment stout, second cylindrical, third petiolate, terminal segment cylin- 

 drical with rounded apex ; antennal organ (fig. 26) composed of five 

 chitinous finger-like processes. Body cylindrical, its segments related 

 as 23 : 26 : 29 : 25 : 22 : 27 : 27 : 27 : 10. Superior claws (fig. 27) 

 broad, curving, distinctly unidentate near the middle of the inner mar- 

 gin ; inferior claws slightly longer, slender, gradually attenuating into 

 a fine filament, untoothed. Anal spines (fig. 28) two, half as long as 

 a superior claw, feebly arcuate, on prominent papilla?. Body sparsely 

 clothed with short curved setae and occasional longer stiff setae, the 

 latter becoming more numerous towards the extremity of the abdomen. 

 Length, 2.7 mm. 



Three specimens, Sitka, June, 1899 (No. 71). 



The Harriman examples of this species agree satisfactorily with the 

 original diagnosis except for lacking a tooth on the inferior claw. The 

 pseudocelli of the body were not studied on account of insufficient 

 material. 



A. octopunctata has seldom been recorded. It was described from 

 a single individual taken at Dudinskoe, Siberia (Latitude 69 25' N.), 

 by the Nordenskiold Expedition in 1875 (Tullberg, 1876, p. 40). 

 The Yenisei Expedition of the following year collected examples at 

 Tschulkova, in Latitude 62 45' N., and the Vega Expedition of 1878- 

 79 found a single specimen at Irkaipi, in Chukchi Land (Latitude 

 68 36' N. Schott, 1894, p. 88). 



APHORURA DENTATA sp. nov 

 (PI. vii, figs. 29-36.) 



White (fig. 29) . Postantennal organs (fig. 30) elongate, of very many 

 minute papillate elements, underlying which are seventeen or more oval 

 structures (fig. 31). Pseudocelli of the head eight, of which two lie 

 behind the base of either antenna (fig. 32) and the remaining four oc- 

 cupy the posterior border of the head (fig. 29). The areas adjoining 

 the antennae are more finely tuberculate than the rest of the head. An- 

 tenna? slightly shorter than the head, with segments related nearly as 2 : 

 5:4:5; basal segment cup-shaped, second and third clavate and petio- 

 late, fourth conical ; antennal organ (fig. 33) of five, rarely four, stout 

 conical processes. Body cylindrical (fig. 29) ; segments related as 10 : 

 13 : 16 : 13 : 13 : 12 : 14 : 10 : 3 ; the number of dorsal pseudocelli for each 

 successive segment is, respectively (fig. 29), 4, 8, 8, 4, 4, 4, 6, 6, o. 

 Superior claws (fig. 34) strongly curved, five-toothed, as follows : 

 paired pseudonychial teeth occur one-third from the base of the claw, a 



