NO. 2134. NORTH AMERICAN COLLEMBOLOUS INSECTS— FOLSOM. 489 



ACHORUTES VIATICUS Tullberg. 

 Plato 13, figs. 82-88. 



Achorutes viaticus Tullberg, 1872, 1876.^Schott, 18915, 1894a, 1896a. — Reuter, 

 1895.— ScHAFFER, 1896, 1897, 19006.— Lie-Pettersen, 1897, 1898.— Scher- 

 BAKOV, 1898.— Carl, 1899, 1901.— Carpenter and Evans, 1899.— Wahlgren, 

 1899a, 1900a.— Skorikow, 1900.— Willem, 1900.— Borner, 190W.— Kraus- 

 bauer, 1901.— Axelson, 1905a, 19056, 1906.— (Axelson) Linnaniemi, 

 1907.— Shoebotham, 1914. 



Achorutes humicola Meinert, 1896. 



Hi/pogastrura viatica (Axelson) Linnaniemi, 1911, 1912. 



Uniform dark blue. Eyes (fig. 82), eight on each side. Post- 

 antennal organs (fig. 83) small, scarcely larger than one of the eyes, 

 with four or five peripheral tubercles. Antennae shorter than the 

 head, with segments as 6:5:7:7 in relative lengths. Fourth antennal 

 segment with four or five olfactory hahs. Abdomen slightly dilated. 

 Unguis (fig. 84) long, slender, feebly curving, minutely unidentate 

 two-fifths from the apex. Unguiculus half as long as unguis; 

 proximal half with a broad suboblong lamella; distal half acicular. 

 Tenent hairs clavate; 3, 3, 3 or sometimes 2, 3, 3; the middle hair 

 longer than the other two. Rami of tenaculum quadridentate. 

 Dentes three times as long as mucrones. Mucrones (figs. 85, 86) 

 subovate in lateral aspect, with apical third falcate and outer lamella 

 proximally broad and rounded, distally excavate. Anal spines 

 (fig. 87) one-fourth to two-fifths as long as hind ungues, curving, on 

 prominent adjacent papillae, which are about one-third as long as 

 the spines. Clothing of numerous setae (fig. 88), short and curving, 

 or longer, stout and stiff; the latter often feebly denticulate. Length, 

 2 mm. 



The tooth of the unguis is often absent. The outer lamella of the 

 mucro varies considerably in form. 



This species was reported from California by Schott) '9lh, p. 23; 

 '96a, p. 186), who said that the specimens from that State agreed 

 fully with those of Sweden. I have never seen North American 

 specimens of this species; hence have made my description and 

 figures from 16 European examples that I have received from Dr. 

 C. Schiiffer. 



Achorutes viaticus is a widely distributed species, occuiTing through- 

 out Europe, in Siberia, Greenland, and other Arctic localities, North 

 America, Argentina, and sub antarctic South America. 



California. — San Francisco, B. Eisen (Cal. Acad. Sci.). 



ACHORUTES GUTHRIEI, new species. 



Plate 14, figs. 89-94. 



Achorutes longispinus Tullberg, Guthrie, 1903. 



Dark blue. Eyes, eight on each side. Postantennal organs (fig. 



89) with four peripheral tubercules. Antennae shorter than the 



head. Sense orj^an of third antennal segment as in figure 90. 



