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When, in 1963, in my synopsis of Nico/etiidae, I synonymized tentatively the poorly described Nico/etia texellsis Ulrich with Nico/etia (Alle/pistilla) w!lee/eri Silvestri, I was certainly not prepared to must correct myself within few years to follow. The error became evident when I received for examination two specimes of a most distinctive type of Nico/etiidae collected, in 1964, by Professor C. Kosswig, the director of the Zoological Institute of Hamburg (Germany), on his Mexico journey. Both specimens were captured on II April in the Quintero caves (Grutas de Quintero), Valles al Mante, Tamaulipas, and will be deposited with the Hamburg Zoological Museum. The present investigation confirms the existence of Ulrich's type of Nico/etia in which the lengthening of legs, cerci, antennae and other appendages reaches its known maximum. Among Diplura, nearly the same degree of lengthening of the appendages may be observed in P/usiocall1pa dargi/alli (Moniez), a troglobitic Call1podeidae from France. The male of Nico/etia texellsis Ulrich does not possess submedian processes on urosternite IV and the species differs thus from all members of the subgenus Alle/pistilla Silv., type Nico/etia lI'!lee/eri Silv. from Texas. The numbers of styli and eversible vesicles of Nico/etia texellsis Ulrich, 8 and 6 pairs respectively, fit with the definition of the genus Nico/etia. On the other hand, a different structure of the median claw separates the species described by Ulrich from the Nico/etia complex, and requires the erection of a new genus for it. Nico/etia texellsis Ulrich being, however, under redescription, it seems premature to create the relevant new genus in the present article. The species has been described originally from Ezell's cave in Hays County, Texas. Further Texas records are included in the recent checklist by Reddell (1966). It, N. texellsis, is one of the most remarkable cavernicolous forms

Occurrence of a new genus of troglobitic Nicoletiidae (Ins., Thysanura) in Mexico