278 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 112 



Generally speaking the accessory setae are longer than the principal 

 ones; no drawing has been made to show this. Bonet (1950) states 

 that the principal setae are very short. 



Tarsus III (fig. 31) bears a distinct spine and a short em podium. 



The mouth parts (fig. 32) were only roughly sketched during the 

 stay in Washington and could not be checked at a later time. They 

 resemble those of vermiforme, in exceeding the foremargin of the head 

 and in having mandibular striae. 



Eosentomon rostratum Ewing 



Figures 33-36 

 Eosentomon rostratum Ewing, 1940, p. 520. 



This species was described by Ewing as having a very long labrum, 

 unique in the genus Eosentomon. Curiously, Ewing (1940) 

 stated that formerly he "doubtless confused this labrum with the 

 mandibles." In fact the species does not have a labrum. 



There are two specimens on the holotype slide, and the data are, 

 Highlands, North Carolina, on molding hemlock and deciduous tree 

 leaves, May 8, 1936, V. R. Watson collector. These specimens were 

 mentioned by Brimley (1938, p. 502) as E. vermiforme. 



Only one other specimen of this species is known, collected at 

 Ganntown, Illinois, December 29, 1932, by B. Harper and determined 

 by Bonet. This specimen also has been used for the present descrip- 

 tion. It is a male. 



Only one foretarsus (see fig. 33) was present on the holotype slide, 

 and it was clearly visible only from the exterior side. The t 1 has a 

 thickened rim, a is very short, c 2 extremely short, and c 1 long; b, c 1, 

 and c 2 are in a line just as they are in E. wheeleri and vermiforme. 

 The t 2 is short and d long; e and g are insignificantly broadened; a' 

 is very long, t 1 just at the base of a 3'; d:p=58:90( = 0.65), a very 

 unusual proportion probably due to some degree to the foretarsus not 

 lying horizontally in the mount; e:u = 20:26 (=0.75). 



The chaetotaxy in every respect is equal to that of vermiforme, 

 with the exception that s IX-X=4, not 6. Figure 34 of tV shows 

 that the accessory setae are shorter than the principal ones, as they 

 are in vermiforme. 



Tarsus III has a distinct spine. 



The mouth parts (figs. 35-36) are characterized by the very long 

 and slender mandibles, which proceed very far in front of the fore- 

 margin of the head; in the holotype they even exceed the maxillary 

 palpi. The galea and laciniae resemble in shape the corresponding 

 ones in vermiforme. The mandibles are striated as in vermiforme. 



