74 H. J. HANSKN. 



rather densely clothed with setas, the major ])art of which are 

 rather short and depressed^ wliilo many are strongly protrud- 

 ing in all directions, considerably longer than the others and 

 in some cases half as long as the depth of the cerci. The ter- 

 minal area is veiy small, nearly three times shorter than the 

 depth of the cerci, and looks outwards and a little down- 

 wards; the surface on the opposite side with some few 

 transverse lines. The apicul seta is exceedingly short, even 

 much shorter than the terminal plan. 



Length. — An extended specimen measured 1'8 mm. ; the 

 two other adult specimens are nearly of the same length. 



Locality. — S. Ana, Misiones, Argentina, July 27th, 1900, 

 three specimens (F. Silvestri) ; Tacurii Pucu (Alto Parana), 

 Paraguay, July 6th, 1900, one immature specimen (F. Silvestri). 



Kemarks. — This species is sharply separated from the 

 other forms by the shape of the second scutum, shape and 

 clothing of the cerci, and the first pair of legs. The name 

 has been chosen in honour of Dr. F. Silvestri, who has col- 

 lected not only this and some others of the species described 

 in this paper, but, besides, sevei'al interesting small forms of 

 Palpigradi and Pauropoda, thereby lending a valuable assist- 

 ance to me. 



Geoup IIL 



5. Scolopendrella Isabella), Grassi. PI. 0, figs. 4 a — 4 /i. 



188G. Scolopendrella Isabella), Grassi, ' Mem. d. lieale 

 Accad. d. Sci. di Torino,^ ser. 2", t. xxxvii, pp. 594-5. 



Material. — Many specimens, adults and young ones, from 

 three localities in Southern Italy. 



Head. — Rather elongate, not quite one third longer than 

 broad. The central rod is interrupted in the middle, without 

 lateral branches ; its anterior part and the frontal branches 

 are strongly developed. 



Antenna). — They contain from seventeen to twenty-one 



