76 



figures of it thaii had hitherto beeu done by Koch and Brrlese. 

 I opeued my preparation and treated the auimal with a warm 

 15°/ solution of caustic kali. To my surprise the truucated posterior 

 shield became rounded ! It was only a fold in the skin ! 



Tritonympha. In fig. 5 I have represented the dorsal aspect of 

 it. — Length about 960 £4. — Colour straw-coloured. — Shape 

 like Parasitus coleoptratorum. — Dorsal side. (Fig. 5). There are 

 two dorsal shields, the anterior one occupying the greater part, 

 the posterior one the smaller part of the dorsum. Between the 

 two shields a wide band of unprotected skin. Six vertical bristles 

 are directed forward, two strong shoulder-bristles outward. Further 

 each of the two shields is provided with four irregular trans- 

 verse rows of bristles. All the bristles are distally somewhat 

 hairy, (fig. 6). The posterior half of the sides and the unprotected 

 skin behind the posterior dorsal shield bear bristles too. Between 

 the legs 1 and 2 the distal end of the peritrema is visible. 



On the ventral side (Fig. 7) the nympha shows a long sternal 

 shield, provided with 8 hairs, two small inguinal shields, and 

 an anal shield with the usual three hairs and a large cribrum 

 behind the postaual hair. This portion is so large, that it may 

 occasionally be observed on the dorsal side (see fig. 5). 



The epistoma (Fig. 5) is tridentate, the central cusp somewhat 

 blunt, the lateral cusps small. 



The mandibles are of the usual type. 



The maxillae (hypostoma, fig. 7) shows horns (outer malae) of 

 the usual type, and middle-sized pointed transparent inner malae, 

 provided with a semicircular thiu membrane with feathered edges. 

 The palps are long (Fig. 5) but do not show anything peculiar. 



The legs are long and slender, except those of the 2d pair (Fig. 5) 

 which are somewhat thicker. 



The male (Fig. 8) is a robust, well chitinized creature. lts 

 length is about 1200 pc. — lts colour yellow-straw-coloured, oc- 

 casionally dark brownish-black (see hereabove). — lts shape 

 remembers us of Parasitus coleoptratorum (L.). The body is well 

 shouldered; behind and before the shoulders a little sinuated in- 





