NO. 2134. KORTIT AMERICAN COLLEMBOLOVS INSECTS— FOLSOM. 491 



bi 



in a large toothlike thickening. Anal spines (figs. 101, 102) long 

 but shorter than hind ungues, slightly curving, on short contiguous 

 papillae, which are one-seventh as long as the spines. Clothing 

 (fig. 103) of minute curving setae with one transverse row of long 

 stiff hairs on each of the first six segments and many such hairs on 

 the last three segments; the long hairs being often minutely serrate. 

 Length, 1.6 mm. 



This species might easily be mistaken for armatiis Nicolet, at first 

 glance, on account of the general similarity in mucrones, claws, and 

 anal spines. It differs from armatus, however, in the following 

 particulars: the toothlike thickening of the outer lameUa of the 

 mucro; anal spines shorter than the mucrones; anal papillae short 

 in relation to the spines; dentes rounded apically; eversible antennal 

 sac absent; character of antennal sense organs; form of postantennal 

 organs; form of basal lamella of unguiculus; type of clothing. In 

 armatus, it should be added, the infra-anal lobes are small; in 

 pseudarmaius they are large (compare figs. 101 and 114). 



California. — Claremont, GiUett. 



British Columbia. — Kaslo, J. W. Cockle. 



Cohfpes.—Cat. No. 19901, U.S.N.M. 



ACHORUTES ARMATUS Nicolet. 

 Plato 7, fig. 2; plate 15, figs. 104-113; plate 16, figs. 114-117. 



Podura armuta, Nicolet, 18il. 



Achorutcs armatus Gervais, 1844. — Nicolet, 1847.— Lubbock, 1868, 1873.— 

 TuLLBERG, 1871, 1872, 1876.— Parona, 1879, 1882, 1888, 1895.— Tomosvary, 

 1883.— OuDEMANS, 1890.— UzEL, 1890, 1891.— MacGillivray, 1891.— Schott, 

 18916, 1894a, lS96a, 1902.— Moniez, 1894.— Dalla Torre, 1895.— Keuter, 

 1895.— Meinert, 1896.— Schaffer, 1896, 1897, 1900a, 19006.— Carpenter, 

 1897.— Lie-Pettersen, 1897, 1898.— Poppe and Schaffer, 1897.— 

 ScHERBAKOV, 1898, 1899.— Carl, 1899, 1901.— Carpenter and Evans, 1899.— 

 Wahlgren, 1900rt. — Borner, 1901cZ. — Krausbauer, 1901. — Willem, 1902.— 

 Agren, 1903, 1904.— AxELSON, 1905a, 19056, 1906.— (Axelson) Linnaniemi, 

 1907, 1909. — Collinge and Shoeeotham, 1910. — Imms, 1912. — Shoebotham, 

 1914. 



Achorutcs holetivorus Packard, 1873. — MacGillivray, 1891. — Dalla Torre, 



1895.— Guthrie, 1903. 

 Achorutcs marmoratus Packard, 1873. — MacGillivray, 1891. — Harvey, 1893. 

 . Achorutcs texensis Packard, 1873. — MacGillivray, 1891. — Dalla Torre, 1895. 

 Achorutcs pratorum Packard, 1873.- — MacGillivray, 1891.— Dalla Torre, 1895. 

 Hypogastrura armata (Axelson) Linnaniemi, 1911, 1912.— Caroli, 1914. 



Very variable in coloration. General color vinaceous, pale violet, 

 greenish gray, or dark blue. One variety is canary yellow marbled 

 with lavender, with two dorsal stripes of the latter color. The 

 dorsum is commonly mottled or marbled, and the pleura and sternum 

 pale yellow with round spots made by hypodermal nuclei. A large 

 interocular spot occurs. Ocular patches conspicuous, black, hemi- 

 spherical. Eyes eight on each side. Postantennal organ (figs. 104, 



