NO. 2037. NORTH AMERICAN SPRINO-TAILS—FOLSOM. 469 



Genus TRITOMURUS (Frauenfeld) Absolon. 



Tritomurus v. Fbauenfeld, 1854, p. 15. 

 Tritomurus Absolon, 1903, p. 94. 



Hitherto only one species of Tritomurus has been known — T. 

 scutellatus, a European cavernicolous species. I have, however, from 

 Cahfornia, several specimens that belong in the genus Tritomurus, as 

 redescribed by Absolon. 



TRITOMURUS CALIFORNICUS, new species. 

 Plate 41, figs. 15-17. 



Color when denuded of scales, yellow, minutely dotted with black. 

 Ocular patches black, small, irregular in form; eyes absent. An- 

 tennae shorter than the body; first two segments yellowish, purple 

 basally; third and fourth segments ringed with purple. Unguis 

 tridentate or bidentate, the teeth being on the basal half of the inner 

 mai^n (pi. 41, fig. 15). Unguiculus without teeth. Fourth abdomi- 

 nal segment slightly longer than the third. Dental spines sixteen to 

 eighteen; proximal spines in two series (pi. 41, figs. 16, 17); formula 

 7-9, 1/2-3, 1, 1-3, 1, 2, 1. Mucrones with four or five intermediate 

 teeth. Length, 3 mm. 



Described from six cotypes; Santa Clara County, California, 

 C. F. Baker. 



This form may easily be mistaken for a species of Tomocerus until 

 close examination shows the absence of tenent hair, tibiotarsal suture, 

 and eyes. In one small spechnen a knobbed tenent hair was present 

 on one of the legs, and its form was like that of Tomocerus. My 

 formula for the dental spines doubtless does not express the entire 

 range of variation, as it is based on an examination of only six 

 specimens. 



The single European species of Tritomurus lives in caves. In regard 

 to the habitat of this Calif ornian species, however, I have no data 

 as yet. 



Cotypes.— C&t. No. 16263, U.S.N.M. 



REFERENCES. 



Absolon, K. 1901. Weitere Nachricht iiber europaische HohlencoUembolen. 



Zool. Anz., 24: 1-11. 

 . 1903. Untersuchungen uber Apterygoten. Ann. k. k. naturh. Hofmus. 



Wien, 18: 91-111. 

 Ageen, H. 1903. Zur Kenntniss der Apterygoten-Fauna Sud-Schwedens. Stett. 



ent. Zeit., 64: 113-176. 

 AxELSON, W. M. 1904. Verzeichniss einiger bei Golaa, im sudostlichen Norwegen 



eingesammelten Collembolen. Ent. Tidskr., 25: 65-84. 

 . 1905. ZurKenntnisder ApterygotenfaunavonTvarminne. Fests. Palmen, 



No. 15: 1-46. 

 . 1906 . Beitrag zur Kenntnis der CoUembolenfaiuia in der Umgebung Revals. 



Acta Soc. F. F. Fenn., 28, No. 2: 1-22. 



