38 (dr. a. C, OUDEMANSJ, NEW LIST OF DUTCH ACARI, II. 



42. Parasitus longulus (C. L. Koch), var. robusta Oudms., nov. var. 

 (With Plate 4, fig. 80—84). 



This form differs trom Parasitus longuhis (C. L. Koch) so shghtly, 

 that I consider it only as a variety of it. 



Its length is hoth in males and in females varying from 870 

 to 1050 M. 



The dorsal sides don't show any peculiarities , except perhaps that 

 the hairs seem to he somewhat stronger. The hairs on the shoulders 

 as well in the type ajs in the variety are much stronger than deli- 

 neated by Berlese. 



On the ventral side the males do not show any tubercles on the 

 first article of the palps. The 2d leg (Fig. 80) is almost similar 

 to that of the type, except that it is of course much stronger. 

 The digitus fixus of the mandibles ends truncated , and has 4 or 

 5 canine teeth (Fig. 8d ) of which one sometimes has three points. 



The ventral side of the female (Fig. 82) differs from that of the 

 type delineated by Berlese, by having two long scuta jugularia, 

 a distinct demarcation between the scuta sternaHa and genitalia, 

 an almost triangular operculum genitale, and a 4th femur which 

 has sometimes two tubercles (Fig. 82 — 84). 



43. Parasitus dentipes (C. L. Koch). 

 (With Plate 4, fig. 85—86). 



Koch's Gamastis dentipes (Deutsch!. Crust. Myr. Arachn. 26. 1.) 

 has a genu and a tibia each provided with an enormous spine •, 

 both spines are directed toward the base of the leg: are turned 

 backward. In fig. 85 and 86 I have delineated the 2d leg of the 

 male, seen resp. from above and from below. 



G. Ganestrini's GamasHS tiòerinus, (called dentipes by Berlesk 

 in his Ac. Myr. Scorp. Ital 68. 2), is quite another species. It 

 has a genu with a spine turned forward and a tibia with a spine 

 turned hacl'irard ; the two spines forming pincers. 



