(dr. a. 0. OÜDEM.VNSi. NOTES ON Af'ART VÌ. 3 



anal apertures are surrounded by minute hairs. The genital aperture 

 is shut by two lips, under each of which 3 suckers are visible. 



Legs. Tydeus-like, with short hairs, a sucker and one claw. 



Fig. 3 shows one of the sensorial hairs on the céphalothorax. 



Fig. 4 one of the stiff abdominal hairs. 



Fig. 5 a palp. 



Fig. 6 represents the tongue. 



Fig. 7 shows us the distal end of a tarsus with the praotarsus 

 provided with a sucker and one claw. 



Fig. 8 is the praetarsus with sucker and claw, seen with 2500 

 linear magnifying powers. No trace of a pulvilluin! 



Habitat; in moss. 



Patria : Netherlands. 



4. Thrombidium novum Oudms., nov. sp, 

 (With Plate 4, fig. 9—19.) 



This larva was found by Mr. ?I. P. Kuyper in numerous spe- 

 cimens on various kinds of Diptera, swarming over Urtica dioica. 



Larva. Length of newly born larva 200 ^f-. without, and 280 f«. 

 with head. 



The body shows a distinct segmentation as well on its back 

 (figs. 9 and 40) as on the belly (fig. 14); seven segments are 

 discernable. The Jlr.it segment bears the first pair of legs, the 

 eyes, the pseudostigmata and the dorsal plate or shield. 'ïhe second 

 segment 4 hairs and the second pair of legs. The third segment 

 four hairs and the third pair of legs. The fourth segment four 

 hairs and the place where the fourth pair of legs will appear. Tlie 

 fifth segment four hairs and the anus. The sixth and seventh 

 segment four hairs each. 



The demarcation between the segments is affected by folds in 

 the skin. These folds follow exactly the very fine wrinkles of the 

 skin. The most remarkable segment in the first. Here we observe 

 on the dorsal side the four eyes, of which the foremost pair is 

 perfectly hlacJc, and the second pair Jvoivnish l)lacl\ They are 

 covered by a high convex cornea. Further the dorsal plate or shield, 



