NO. 2222. NORTH AMERICAN ONYCHIURINAE—FOLSOM. 653 



guard setae, 14 or 15 papillae in three rows, three erect sense clubs, 

 and two sense rods. Tarsus with two claws, the unguis being 

 pseudonychiate (as in Tomocerus). Furcula present, normally 

 developed, on the fourth abdominal segment. TenaciUum present. 

 Anal and genital segments confluent. Abdomen posteriorly six- 

 lobed, with two anal spines and four spine-like tubercles. 



The genus Tetrodoniophora, which has not as yet been found on 

 this continent, is based upon the European T. hielanensis Waga 

 igigas Renter), a cavernicolous species, dark blue, and of relatively 

 large size, attaining a length of 9.2 mm. 



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