304 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 112 



The specimens determined by Bonet agree with the holotype in 

 every character (sensillae of foretarsus, comb, filamento di sostegno, 

 teeth on hind border of terga X and XI), except in the chaetotaxy; 

 as they are mature specimens, however, we shall give the chaetotaxy 

 on the basis of them, and show afterward the deviation from the 

 holotype. 



On the foretarus (figs. 94-95), t 1 is long and slender, not clavate; 

 t3 long, lancetlike; d:p = 75:50(=1.5). The e is rather short and 

 situated extraordinarily near d; f is much longer than g. The a' is 

 missing. The empodium is small; e:u=9:46(=0.2). 



The chaetotaxy (figs. 96-97) schematically is as follows: 



The chaetotaxy of the holotype differs in the following points: 

 s I posterior row, 2 setae (in all other specimens, including the para- 

 type, 4 setae); s III-V anterior row, 3 setae (also in the paratype; in 

 the other specimens, 5 setae) ; s VI anterior row, 4 setae (which must 

 be abnormal). 



It is remarkable that the microchaeta "3a" is present in t II-VI 

 (fig. 99). Another unique feature is the difference between the 

 number of setae in the anterior row of sll and sill, a difference which 

 does not seem to develop until the adult stage. 



On the hind margin of t X and t XI there is a row of fine teeth which 

 are smaller in the maturi juniores and larger in the adults (fig. 100). 

 No teeth are visible on the sterna. 



The comb of abd. VIII (fig. 101) is remarkable in that its median 

 tooth is broad and has a small secondary tooth in the middle; there 

 are 7-8 teeth. 



The filamento di sostegno (fig. 102) is rather long, with a large 

 spherical bulb at the end; the swelling is not smooth but verrucous. 



The head (fig. 103) shows a very small labrum; however, this condi- 

 tion does not justify transferring the species to Acerentomon. The 

 palpi maxillarcs are distinctly like those of Acerentulus. 



