NO. 2222. NORTH AMERICAN ONYCHIURINAE—FOLSOM. 651 



tubercles. Dorsal pseudocelli of head as follows (fig. 10): Antennal 

 bases, 2 + 2; behind antennal bases, 1 + 1; posterior border of head, 

 3 + 3. Ventral pseudocelli of head as follows: Anterior, 1 + 1; poste- 

 rior, 1 + 1. Antennae slightly shorter than the head. Sense organ 

 of third antennal segment (fig. 90) with five slender papillae, five 

 guard setae, two sense rods, and two subrcniform smooth oblique 

 sense clubs. Pseudocelli of body as follows — Prothorax: Pronotum, 

 0; proximal precoxal, 2 + 2; coxal, 1 + 1. Mesothorax and meta- 

 thorax: Dorsal, 3 + 3; antero-ventral, 1 + 1; proximal precoxal, 2 + 2; 

 coxal, 1 + 1. First abdominal segment: Dorsal aspect, 4 + 4; antero- 

 ventral, 1 + 1 ; base of ventral tube, 2 + 2 (lateral and posterior, 

 respectively). Second abdominal: Dorsal aspect, 4 + 4; postero- 

 ventro-lateral, 1 + 1 . Third abdominal: Dorsal aspect, 3 + 3; postero- 

 ventro-lateral, 1 + 1. Fourth abdominal: Dorsal, 3 + 3; lateral, 

 3 + 3 or 2 + 2; postero-ventro-lateral, 1 + 1. Fifth abdommal: 

 Dorsal, 3 + 3; postero-lateral, 1 + 1. Sixth abdominal: 0. Unguis 

 (figs. 91, 92) curved, untoothed. Unguiculus extending a little 

 more than half as far as the unguis, broadly lamellate proximally, 

 attenuate distally. Anal spines absent. Anus ventral. Clothing 

 (fig. 93) of short sparse setae, becoming longer and stiffer posteriorly. 

 Cuticular tubercles relatively minute (fig. 94). Length, 1.5 mm. 



i^seudqfimetarius is close to fimetarius, the arrangement of most of 

 the dorsal pseudocelli being essentially the same in the two species, 

 though the former species differs in having no pronotal pseudocelli 

 and in having 3 + 3 pseudocelli on the posterior border of the head 

 (this latter condition occurring, however, as a variation in some 

 Swedish examples of jimetarius) . Psendojimetarms differs further 

 irom fmetarius in having four pseudocelli on the ventral surface of 

 the head and differs markedly in the structure of the sense organ of 

 the third antennal segment. 



This is the form that Guthrie ('03) referred to Aphorura inerrnis 

 Tullberg, as I learned from a study of two of Guthrie's specimens, 

 loaned to me by Prof. Henry F. Nachtrieb. 



This species occurs on damp soil under decaying logs or dead 

 leaves. 



Illinois: Homer, April 2, 3, 9, May 7, 8, November 7. Urbana, 

 March 13, 17, April 3, 5, 11, 25. 



Minnesota: April 8, J. E. Gutlirie (Univ. of Mmn.). 



Cotypes. —C&t, No. 20762, U.S.N.M. 



Genus TULLBERGIA Lubbock, Borner. 



Tullbergia Lubbock 1876. 

 Stenaphorura Absolon 19006. 

 Mesaphorura Borner 1901a. 

 Boemeria Willem 1902. 

 Tullbergia Borner 19026. 



