296 



The peritrema resembles tbat of L. musculi (Fig. 28). My draw- 

 ing is made from a specimen treated with caustic kali. 



The legs are shorter and thicker than in L. musculi (C. L. Koch); 

 especially legs 1 and 2 ; the tarsi 1 have no long tactile hairs. 

 The fernurs 1 and 2 have 2 strong bristles dorsally, planted on 

 a tubercle each. 



Length 510 — 580 &. Colour pale. 



Habitat: nest of Mus munitus. 



Patria : Germany. 



25. Liponyssus spinosus Oudnis., nov. sp. 



(With Plate IX, fig. 30-31. 



Female. Length 560 /z. Colour straw-coloured. Shape like that 

 of L. albatus (C, L. Koch). Dorsal side (Fig. 30). Besides the 

 distinct shoulders on the level of the legs 2, the animal shows 

 two distinct intermediate shoulders on the level of legs 1. More- 

 over the outliues are oval, with nearly parallel sides and rounded 

 posterior end of abdomen. The dorsum is protected by a scaly 

 shield, following in outlines the shoulders and the vertex, oval 

 posteriorly, resembling that of Lip. albatus, mentioned above. But 

 this shield is provided with short and thick spines. The unprotected 

 abdomen bears spines too. At the sides a small portion of the 

 peritrema is visible. 



Ventral side (Fig. 31). The sternal shield is nearly trapezoidal, 

 but still longer than in Lip. albatus. The genital shield is well 

 chitinized and may be considered as a fusion of a genital and a 

 ventral shield, resembling that of some species of Laelaps. The 

 anal shield has the usual three spines and posteriorly the cri- 

 britm. The ventral and anal shields are flanked with spines. 



The peritrema ruus forward to the level between the legs 2 

 and 1. 



I could not well distin guish the structure of the hypostoma, but 

 it bears 6 thick spiues, 4 anterior and 2 longer posterior ones 

 (Fig. 31). The palpi are thick, but do not show any particulars. 



The epistoma is rounded anteriorly (Fig. 30). 



