EWING'S PROTURAN SPECIES — BONET AND TUXEN 267 



used in this and all future papers by us. The setae and sensillae of the 

 foretarsus are numbered on the figures according to the system de- 

 scribed by Tuxen in 1955 and 1958. Readers of the Bonet papers of 

 1949 and 1950 should be aware of this difference. 

 The 18 species whose types we shall deal with here are the following: 



Genus Eosenlomon Berlese: A. conurus Ewing 



E. vermiforme Ewing A. andrei Ewing 



E. pallidum Ewing A. chrislensoni Ewing 



E. minimum Ewing A. occidentalis Ewing 

 E. yosemitense Ewing Genus Acerentulus Berlese: 



E. rostratum Ewing A. barberi Ewing (=A. tenui- 

 E. pusillum Ewing ceps Ewing) 



Genus Protentomon Ewing: A. oculatus Ewing 



P. transitans Ewing A. bicolor Ewing ( = Aceren- 



Genus Microentomon Ewing: iuloides bicolor) 



M. minutum Ewing A. floridanus Ewing ( = Aceren- 



Genus Acerentomon Silvestri: tornon floridanum) 



A. americanum Ewing A. aureilarsus Ewing 



A neotype of Acerentomon calijornicum (Hilton) (= Acerentulus 

 californicus Hilton) is described and a redescription is given of Eosen- 

 tomon wheeleri Silvestri on the basis of Ewing's specimens. 



Of Ewing's genera only Protentomon is valid, and of his 19 species 

 only the following are valid: Eosentomon vermiforme, E. pallidum, E. 

 yosemitense, E. rostratum, E. pusillum, Protentomon transitans, 

 Acerentomon andrei, Acerentulus americanus, A. barberi, A. floridanus, 

 and A. aureitarsus. 



The concept of Acerentomon and Acerentulus used in this paper is 

 based on the labrum and the maxillary palpi, and holds good in 

 extreme cases, but transitional forms may be found. The justification 

 of the two genera needs reexamination. 



Eosentomon tcheeleri Silvestri 



Figures 1-14 



Eosenlomon wheeleri Silvestri, 1909, p. 8. — Ewing, 1940, p. 523. — Not Eosentomon 

 wheeleri Bonet, 1942, p. 15 (=E. boneli Tuxen, 1956b, p. 719). 



The species described by Silvestri in 1909 as wheeleri was collected 

 in humus in woods around New York. The type was said (Tuxen 

 1956b, p. 719) to be missing from Silvestri's collection of Protura 

 in Portici. 



In 1940 Ewing described a species as wheeleri from material collected 

 in Maryland, Virginia, and Texas. He had not seen the type specimen. 



In 1942 Bonet described a species as wheeleri from several localities 

 in Mexico. In 1956 Tuxen decided to make a specimen of this latter 

 species the neotype of wheeleri, since the holotype was supposedly 



