88 FOLSOM [90] 



ANURIDA AMORITA sp. nov. 



(PI. iv, fig. 3 ; PI. vi, figs. 19-24.) 



General color bluish gray, due to the combined effect of indigo blue 

 mottlings with the white ground color (fig. 3). The dorsum of each 

 segment has two parallel broken blackish stripes (fig. 3). Eyes (fig. 

 19) five on either side, on blackish patches. Postantennal organs oval 

 (fig. 20) or bent, as in fig. 21 (both figures are from the same head), 

 with from thirty to forty elements. Antennae almost as long as the 

 head ; segments related asi2:i2:ii:io; first three dilated apically ; 

 fourth rounded conical, bearing an organ (fig. 22) consisting of three 

 large contiguous bladder-like structures upon a chitinous base. Body 

 (fig. 3) elongated, abdomen gradually dilated. Claws of mid and 

 hind feet (fig. 23) gradually tapering from a broad base, slightly curv- 

 ing, strongly unidentate near the middle of the inner margin ; claws of 

 fore feet (fig. 24) smaller and less tapering. Clothing of short dense 

 curving sets, with a transverse row of long hairs on each segment. 

 Maximum length, 4.1 mm. 



Type. Cat. No. 5437, U. S. Nat. Museum. 



Described from thirty-six types, Kukak Bay (No. 70). 



This species is most nearly allied to A. tullbergi Schott (1891, p. 

 192; 1894, pp. 91-92, taf. 8, figs. 16-18) which, however, has but 

 twenty-four to thirty-eight elements in each postantennal organ, and 

 more slender, untoothed claws, not to mention differences of minor 

 importance. The curious antennal organ, already found on A. man- 

 tima, attains a much greater size in A. amorita. 



APHORURA OCTOPUNCTATA (Tull.). 



(PI. vn, figs. 25-28.) 



Lipura octo-ptmctata TULLBERG, Ofv. k. vet. Akad. forh., xxxin, no. 5, p. 



40, taf. ii, figs. 51-53, 1876 (Siberia). SCHOTT, K. sven. vet. Akad. 



hand., xxv, no. n, p. 88, 1894 (Siberia). 

 Aphorura octopunctata SCHAFFER, Fauna Arctica, bd. I, lief. 2, p. 241, 1900. 



White. Postantennal organs (fig. 25) elliptical, of about thirty- 

 three to thirty-seven elements. Pseudocelli of the head, fourteen ; four 

 behind the base of either antenna (fig. 25) and six, in two transverse 

 rows, on the posterior border of the head. Antenna? shorter than the 

 head, with segments related in length nearly as 7 : 10 : 9 : 12 ; basal seg- 



