E WING'S PROTURAN SPECIES — BONET AND TUXEN 277 



Eosentomon yosemitense Ewing 



Figures 29-32 

 Eosentomon yosemitensis Ewing, 1927, p. 146; 1940, p. 528. — Bonet, 1950, p. 123 



According to grammatical rules the spelling should be yosemitense 

 since Eosentomon is neuter. 



The species was redescribed, especially in respect to the chaetotaxy, 

 by Bonet (1950) without figures. 



The holotype is the only specimen of the species known, and bears 

 the label, floor of Yosemite Valley, California, in decaying leaves and 

 twigs, H. E. Ewing collector, April 15, 1927. It is impossible to give 

 a complete description of all characters. 



Only one of the foretarsi (see fig. 29) is present on the holotype 

 and is somewhat damaged. The sensillae on the interior side as well 

 as some of the exterior ones are not visible. The t 1 has the same 

 thickened rim as in E. vermiforme, but is situated more proximally to 

 a 3'; d:p = 7:6(=1.15). The a could not be seen, and c 2 seems to 

 be broken off; b is situated distally to c 1-c 2, not in a row as in 

 vermiforme; e:u=10:12(=0.85). 



In 1940 Ewing remarked that "the dorsal setae of tarsus I arise 

 from tubercles." This statement is incorrect; we can see no difference 

 in this respect from the other Eosentomon species. 



The female squama genitalis (fig. 30) is very different from that of 

 the other species, the processus sternales forming a kind of ring, open 

 at two sides, surrounding the opening of the oviduct. It must be 

 pointed out that the squama in the drawing is seen from the ventral 

 side, but in the drawings of the other American species, from the dorsal 

 side. However, this change cannot account for the great difference 

 (see also the drawings of the squama of E. armatum (=E. transitorium) 

 from both sides in Tuxen, 1958). The "ring" is not horizontal but 

 somewhat oblique. 



The chaetotaxy schematically is as follows: 



" "1-3" are missing. 



The missing anterior row of sVIII places the species in the pallidum 

 group of Bonet; characteristic are the missing No. 2 in the anterior 

 row of tlV and Nos. 2-3 in the anterior row of tV-VI; in other cases 

 the setae will be lacking in the following order (from abd. IV- VII) : 

 "3," "1," and "2." Also the small number of setae in sIX-X is 

 characteristic. 



