NO. 2222. NORTH AMERICAN ONYCHIURINAE—FOLSOM. 649 



anal spines. I have found it rather common among grass roots and 

 in the woods under damp logs. 



lUinois: Homer, April 3, May 7, 8. Urbana, April 12, 18, October 

 26. 



Coty pes. —Cat. No. 20761, U.S.N.M. 



ONYCHIURUS FIMETARIUS Linnaeus, Lubbock. 



Plate 69, fig. 9; plate 77, figs. 83-86; plate 78, figs. 87, 88. 



Podura fimetaria Linnaeus, 1767. — Fabricius, 1793. 



lApura fimetaria Burmeister, 1838. — Lubbock, 1868, 1873. — Packard, 1873. — 



Parona, 1879, 1888.— Oudemans, 1890.— Uzel, 1890, 1891.— MacGillivray, 



1891.— Carpenter and Evans, 1899. 

 Lipura volvator Gervais, 1844. 

 AnuTophorus fimetarius Nicolet, 1847 (not of 1841). 



Lipura inermis Tullberg, 1869, 1871, 1872. — Reuter, 1890, 1895. — Schott, 

 1891, 1894a, 18946, 1896.— MacGillivray, 1894.— Lie-Pettersen, 1896. 

 Lipura wrightii Carpenter, 1895, 1897. 

 Aphorura inermis Schaffer, 1896, 19006.— Carl, 1899.— Absolon, 1900a, 19006 



1901a, 19016.— Krausbauer, 1902.— Schott, 1902. 

 Aphorura fimetaria Carl, 1899. 

 Onychiurus inermis Borner, 1902a. — Voigts, 1902. 

 Onychiurus fimetarius Agren, 1903, 1904. — Axelson, 1905a, 1906. — (Axelson) 



Linnaniemi, 1907, 1912. — Collinge and Shoebotham, 1910. — Caroli, 1914. 



White. Abdomen broad, rounded behind (fig. 9). Postantennal 

 organs (fig. 83) elongate, each with 8 to 17 branched tubercles. Pseu- 

 docelli of head as follows: Antennal base, 2 + 2; behind antennal base, 

 1 + 1 ; posterior border of head, 1 + 1 or 2 + 2 ; ventral surface of head, 



1 + 1 . Antennae shorter than the head. Sense organ of third anten- 

 nal segment (fig. 84) with four slender papillae, five guard setae, two 

 sense rods, and two ovate erect smooth sense clubs. PseudocelU of 

 body (fig. 9) as follows: Prothorax — dorsal, 1 + 1; proximal pre- 

 coxal segment, 2 + 2. Mesothorax — dorsal, 2 + 2; proximal precoxal, 



2 + 2; antero-ventral, 1 + 1. Metathorax — dorsal, 2 + 2; proximal 

 precoxal, 2 + 2; antero-ventral, 1 + 1. First abdominal segment: 

 Dorsal, 3 + 3; lateral (base of ventral tube), 1 + 1; antero-lateral, 

 1 + 1. Second abdominal: Dorsal, 3 + 3; antero-ventral (behind 

 ventral tube), 1+1; postero-ventral, 1 + 1. Third abdominal: 

 Dorsal, 3+3; ventro-lateral, 1 + 1; postero-ventral, 1 + 1. Fourth 

 abdominal: Dorsal aspect, 5 + 5 (dorsal, 3 + 3 ; lateral, 2 + 2) ; postero- 

 ventral, 1 + 1. Fifth abdominal: Dorsal, 3 + 3; ventral, 1 + 1. 

 Sixth abdominal: 0. Unguis (figs. 85, 86) slender, curvmg, 

 untoothed. Unguiculus gradually tapering, distally attenuate, 

 three-fourths as long as unguis. Anal spines absent. Anus ventral. 

 Clothing (fig. 87) of spai'se short setae, a little longer and stiffer on 

 the posterior part of the abdomen. Cuticular tubercles relatively 

 coarse (fig. 88); coarser on the head than on the body. Length, 

 often 1.8 mm.; maximum, 2.1 mm. 



