NO. 2222. NORTH AMERICAN ONYCHIURINAE—FOLSOM. 647 



ONYCHIURUS OCTOPUNCTATUS TuUberg. 



Plate 75, figs. 61-64. 



Lipura octo-punctata Tullberg, 1876. — Schott, 1894. 

 Aphorura octopunctata Schapfer, 1900a. — Folsom, 1902. 



White, Postantennal organs (fig, 61) elliptical, each with about 

 33 to 37 simple tubercles, PseudocelU of antennal bases 4 + 4 (fig. 

 61); of posterior border of head 3+3. Antennae shorter than the 

 head. Sense organ of third antennal segment with five papillae 

 (fig. 62). Unguis (fig, 63) broad, curving, unidentate near the middle 

 of the inner margin. Unguiculus a little longer than unguis, slender, 

 gradually attenuating into a fine filament, untoothed. Anal spines 

 (fig. 64) two, half as long as unguis, stout, feebly arcuate, on promi- 

 nent papillae. Body sparsely clothed with short curving setae and 

 occasional longer stiff setae, the latter becoming more numerous 

 toward the extremity of the abdomen. Length, 2,7 mm. 



The only examples of this species that I have seen are three from 

 Alaska, taken by the Harriman Expedition in 1899. These speci- 

 mens agree with the original description and figures except for lack 

 ing a tooth on the unguiculus. The pseudoceUi of the body were 

 not studied on account of insufficient material, 



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

 a single individual taken at Dudinskoe, Siberia Qatitude 69° 25' N.) 

 by the Nordenskiold Expedition in 1875 (Tullberg, '76, p, 40). 

 The Yenisei Expedition of the following year collected examples at 

 Tschulkova (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, '94, p. 88). 



Sitka, Alaska, June, Prof. Trevor Kincaid (U.S.N.M., Harriman 

 Collection, No. 71), 



ONYCHIURUS DENTATUS Folsom. 



Plate 69, fig. 7; plate 75, figs. 65-68; plate 76, figs. 69-75. 



Aphorura dentata Folsom, 1902. 



White (fig. 7). Postantennal organs (fig. 65) elongate, each with 

 hundreds of closely set papillae, which arise from about 17 tubercles, 

 the stalks of which are shown in section in figure 66. PseudocelU of 

 antennal bases 2 + 2 (fig. 67). Antennae sUghtly shorter than the 

 head, with segments related nearly as 2:5:4:5 in relative lengths. 

 Sense organ of third antennal segment (fig, 68) with five (rarely 

 four) stout subcorneal papiUae, five guard setae, a pair of slender 

 fusiform sense rods and two papillate sense clubs. Unguis (figs. 

 69, 70) strongly curving, basaUy tuberculate, five or six toothed, as 

 follows: paired pseudonychial teeth occur one-third from the base 

 of the claw; a second pair of lateral teeth is present near the apex of 

 the claw; and one or two distal teeth are situated on the outer margin. 



