ACARI 571 



bristle exceeding the length of the joint, and numerons, finely 

 pointed, tactile hairs. 



Hypostoma (fig. 79). The 4 hjrpostomatic hairs are 

 arranged as follows : one hair, projecting as far as the top of 

 the maxillary lobes, is inserted at the base of thèse ; two 

 hairs on an obliquely transverse line, half-way between the 

 anterior and the posterior pair ; of thèse the latéral one is 

 much smaller than the médian one. The posterior pair is 

 inserted laterally, straight behind the latéral, médian pair, 

 and half-way between the base of the maxillary lobe and that 

 of the hjrpostoma. The maxillary lobes are bent upwards and 

 nwards, so as to become scarcely visible on a ventral view ; 

 they are narrow, shghtly curved and project to the middle of 

 the maxillary plates. Between the lobes and the plates 

 the edge has a small, triangular blade. 



The maxillary plates areof even width, with parallel edges 

 in the distal half , but taper gradually further forward, towards 

 the finely pointed, lanceolate, terminal slips, which attain a 

 length of only one third that of the plates ; posterior half of 

 the tapering edge is finely serrated, the anterior half is 5 to 

 6 pectinated. 



Ventral side (fig. 80). 



Tritosternum. The trunk is shorterthan wide at the base ; 

 the slips are very narrow, setiform, with only a few hairs. 



No jugular shields. 



The sternal shield is completely fusedwith metasternal 

 shields into one, which, by a narrow strip of soft cuticle, is 

 demarcated from the ventri-anal shield; the anterior mar- 

 gin is excavated in the middle, where the génital aperture 

 is situated ; truncated posteriorly, with rounded angles ; it 

 extends backwards beyond the middle of coxse IV. There are 

 5 pairs of hairs, viz. the 3 pairs of sternal hairs, the metasternal, 

 and the génital pair. They are placed as follows : one pair near 

 the anterior margin, on each side of the génital aperture ; 

 one pair on a level with the middle of coxae II ; one on a level 



