6o4 



IVAR TRAGARDH 



The specimens from Juan Fernandez differ from those previously recorded 

 by the author from the Faroe-Islands and from the French caves, but not 

 enough to warrant the establishing of a new variety. 



The mandibles of the male (fig. 109) differ in the following way. The 

 lower jaw resembles in some respects that of the Faroe-specimens, in other the 

 French specimens. The general shape is that of the latter in that it is not 

 curved like a hook at the top but has a terminal tooth, the anterior edge of 

 which forms a right angle with the longitudinal axis. But this tooth is double 



and clearly constricted at the base, 

 and the dentition further backwards 

 is that of Faroe-type, only the teeth 

 are much bigger (compare Tragardh 

 1931. figs. 8 and 9). The upper jaw 

 has the same general shape as in the 

 French specimens, but the rounded in- 

 cision in front of pilus dentarius is 

 deeper and the teeth further back- 

 wards a little bigger. 



The legs II (fig. no) resemble 

 those of the typical variety as de- 

 lineated by Berlese. 



Figs. 109— no. Pergajtiasus crassipes (L.) var. 



longicornis Berlese. 

 109. Mandible c?". 1 10. Processi tibiales of leg II cf • 



Loc: Juan Fernandez, Masa- 

 tierra. Among dry leaves. 



19. Gamasiphis uncifer n. sp. — Figs, iii — 117, 



Amongst dry leaves mentioned above (p. 587) there were several speci 

 mens of this species which were sufficiently well preserved to allow of a de- 

 tailed description. 



Male. 



Length 800 {a, width 580 {i. 



Shape typical for the genus, with highly arched dorsal side. 



Colour chestnut-brown. 



Texture extremely finely scaly. 



Dorsal side covered by a single, highly arched shield which has about 

 24 pairs of hairs, which have, however, nearly all fallen off. 



Ventral side (figs. 112 and 114). Jugular shields narrow, triangular, 

 tapering towards the centre. Sternal shield narrowest between coxae II, ex- 

 tending backwards to the level of the hind margin of coxae IV; anterior margin 

 slightly excavate. Genital aperture large, on three sides surrounded by the 

 sternal, shield and covered by an oval plate slightly wider than it is long. Of 

 the 5 pairs of sternal hairs one is placed near the anterior margin, a little 

 nearer to the genital shield than to the lateral margin, the other four laterally, 

 II a little in front of the posterior margin of coxae II, III and IV near anterior 



