644 PROCEfWINGS OF THE XATIOXAL MUSEUM. voi.. 53. 



ONYCHIURUS LITOREUS, new species. 



Plate 68, fig. 4; plate 73, figs. 39-42. 



White. Postantennal organs (fig. 39) elliptical, each with about 

 20 simple tubercles. Pseudocelli of antennal bases 2+2, in pairs. 

 Base of head with 2+2 pseudoceUi, in obhque pairs. Antennae 

 shorter than the head. Sense organ of third antennal segment with 

 five papillae, five guard setae, two ovate papillate sense clubs and 

 probably two sense rods. Dorsal pseudoceUi of body (fig. 4) 1+1 

 on segments one to six, inclusive; 2+2 in oblique pairs on segment 

 seven; 3+3 on segment eight, as follows: 2+2 posterior, in obhque 

 pairs, and 1+1 antero-lateral ; pseudoceUi absent on segment nine. 

 Postero-lateral pseudocelli 1 + 1 on each of the first three abdominal 

 segments. Unguis (fig. 40) long, slender, strongly curving, untoothed. 

 Unguiculus extending less than half as far as the unguis, lamellate, 

 with straight outer margin and short acuminate apex. Anal spines 

 (fig. 41) two, half as long as hind ungues, stout, feebly curving, on 

 widely separated papillae, wliich are half as long as the spines. 

 Clothing of sparse minute setae, becoming longer posteriorly. Cuti- 

 cidar tubercles minute (fig. 42). Length, 1.3 mm. 



Neponset, Massachusetts, May 4, October 10, 20, on the seashore 

 between tide marks, under stones with Anurida marititna. 



The cotypes of this species are in the author's collection at present. 



ONYCHIURUS ARMATUS Tullberg. 



Plate 68, fig. 5; plate 73, figs. 43-51. 



Lipura armata Tullberg, 1869, 1871, 1872, 1876. — Lubbock, 1873. — Reuter, 

 1876, 1890, 1895.— UzEL, 1890, 1891.— MacGillivray, 1891.— Schott, 1894 a.— 

 Lie-Pettersen, 1896, 1898.— Carpenter and Evans, 1899.— Willem, 1900.— 

 Evans, 1901. 



Lipura arciica Tullberg, 1876. — Schafper, 1894. — Schott, 1894 a. — Lie-Petter- 

 sen, 1898. — Lubbock, 1898. 



Lipura ambulans Meinert, 1896. 



Aphorura armata Schaffer, 1896, 1897, 1900o, 19006. — Poppe and Schapfer, 

 1897.— ScHERBAKOW, 1898.— Carl, 1899, 1901.— Absolon, 1900a, 19006.— 

 Wahlgren, 1900a, 19006.— Borner, 19016, 1901rf.— Krausbauer, 1902. 



Aphorura arctica Scherbakow, 1899a, 18996. — Wahlgren, 1899, 1900a, 19006. — 

 Axelson, 1900. — Schafper, 19006. — Skorikow, 1900. 



OnycMurus armatus Burner, 1902a, 1907. — Voigts, 1902. — Agren, 1903, 1904. — 

 Axelson, 19036, 1904, 19056, 1906.— (Axelson) Linnaniemi, 1907, 1909. 

 1911, 1912.— Wahlgren, 1906.— Shoebotham, 1914. 



OnycMurus arcticus Axelson, 19036. 



Aphorura ambulans Guthrie, 1903. 



OnycMurus armatus var. arctica (Axelson) Linnaniemi, 1909, 1912. 



White. Elongate; abdomen slightly dilated (fig. 5). Postan- 

 teimal organs (fig. 43) elongate-elUptical, each with 18 to 44 (usuaUy 



