EWING'S PROTURAN SPECIES — BONET AND TUXEN 295 



fornicus are not in the U.S. National Museum, as we both had the 

 opportunity of ascertaining when we were in Washington. They 

 must therefore be regarded as lost. 



The californicus slide on which Ewing based his short redescription, 

 however, is present. It bears the label in Hilton's writing, A. calif. 

 9 Cobell's Canyon, Calif., Jan. 1938. As this seems to be the only 

 known specimen of the species, and as it was determined by Hilton, 

 we designate it as a neotype. It is a well preserved female, cleared 

 and stained. 



Now it appears that this specimen is exactly identical with the type 

 of Acerentomon occidentalis Ewing. The foretarsi are visible from 

 above and therefore do not appear to be as broad as those in the type 

 specimen of this species, but all sensillae are visible and of the same 

 length and position as in occidentalis. The chaetotaxy is exactly alike, 

 the only differences being within the range of variability (see above), 

 viz., s II-III = %, s VI = %. The teeth on t IX-XI and s IX-X 

 are exactly alike, as are the labrum and the filamento di sostegno. 

 It is impossible for us to see any difference, and so we must state that 

 Acerentulus californicus Hilton is a synonym of Acerentomon occi- 

 dentalis Ewing. As californicus is the older name, it has priority in 

 spite of the poor description given by Hilton. Thus, the species should 

 be called Acerentomon californicum (Hilton). 



Acerentulus barberi Ewing 



Figures 77-83 



Acerentulus barberi Ewing, 1921a, p. 240. 

 Acerentulus tenuiceps Ewing, 1921b, p. 198. 

 Acerentulus barberi barberi Ewing, 1940, p. 549. 



This was the first American proturan to be described after Sil- 

 vestri's E. wheeleri. There are many slides in the collection, some of 

 them marked barberi and others tenuiceps. Ewing realized in 1940 

 that these two species described by him were identical. Then he 

 called the species barberi barberi, as he thought Hilton's californicus 

 was a variety of it. It has been shown above, however, that this 

 is correct; so the species should keep its binary name. 



The holotype bears the label, Takoma Park, Maryland, Feb. 14, 

 1921, from decaying leaves, H. E. Ewing collector. In addition to the 

 holotype, we examined a male and a female determined as barberi 

 and labeled, Chesterville, Illinois, Oct. 18, 1921, in decaying leaves 

 and twigs, killed Nov. 7, 1921, H. E. Ewing collector (we will call 

 these "specimens 2 and 3"), and also a male and a female determined 

 as tenuiceps, but corrected by Ewing to barberi and bearing the label, 

 Takoma Park, Maryland, April 3, 1921, from decaying leaves, H. E. 

 Ewing collector (we, will call these "specimens 4 and 5"). 



