390 MB. A. D. MICHAEL ON HTPOPI, 



9. That the external form of Hypopus is a protective provision 

 given to some Acarina vphich have to be distributed by attaching 

 themselves to insects or other creatures, which will expose them 

 to heat and draught that would kill them, were it not for this 

 protection ; and that the protective dress may be given either to 

 immature or adult creatures. 



10. That the creature which I have called Disparipes hombi is 

 an adult aud a separate species of which the females only have 

 assumed what may be called the hypopial dress, and are parasitic, 

 probably as a means of conveyance. 



11. That there appear to be other species of the same genus. 



12. That probably Donnadieu's bee-parasites are adult species 

 as he says, but that it is not absolutely certain that they are 

 identical with Dufour's TricJiodactylus . 



Order ACAEINA. 



Suborder Tracheata. 

 Family Mtobiad^. 



Grenus Dispaeipes. 



Characteristics of the Genus. — Legs dissimilar. First leg terminated by a 

 single claw, without caruncle, and second and third legs by a double claw, 

 with or without a caruncle, in both sexes. Fourth legs much thickened, 

 terminated by very long setae without claw or caruncle ; setae different 

 in the two sexes. Anterior part of female entirely hidden beneath a 

 chitinous carapace. Rostrum articulated to cephalothorax, and bearing 

 four rod-hke projections ; other mouth-organs rudimentary, or very 

 slightly developed. 



Dispaeipes bombi, gen. nov. Plate XV. 



Male (fig. 1). Average length, about -22 mm, 

 „ breadth, about "12 mm. 

 „ length of legs, 1st pair, '11 mm. 

 ,j „ ,, 2nd pair, '10 mm. 



3rd pair, -11 mm. 

 „ „ „ 4th pair, '07 mm. 



Colour semitransparent white, with a yellowish shade in parts. 

 A large shield-shaped space at the posterior end of the uotogaster 

 brown. The excretory organs show through the dorsal surface, 

 forming a large, opaque, white mark. 



Texture rough and leathery, not hard nor chitinous. 



