388 



Transactions of the Society. 



pairs ; and a short, thick, curved hair on each third joint of the 

 first pair, and each second and third joint of the second pair of 

 legs ; a few other fine hairs. Claws and caruncles as in the 

 perfect forms. 



Abdomen almost square, except that the hind margin is 

 cut into four rounded lohes, of which the central pair are the larger 

 and further back. Above these two central lobes, and a little 

 further forward, are two large conical papillae, or apophyses, directed 

 upward and backward. In front of these is a transverse ridge 

 with the ends turned forward, and bearing two large rough hairs. 

 The notogaster is nearly, but not quite, flat ; the central part being 

 slightly arched and divided by a narrow and shallow depression 

 from the slightly raised and rounded edge, which is also rather 

 lobed at the anterior and posterior ends. The notogaster bears a 

 number of plates of a similar nature to those on the cephalothorax ; 

 the forms and arrangement of which are usually much as follows, 

 viz. : two longitudinal rows, each of about four pine-shaped plates, 

 on the arched central portion ; and on each lateral border, proceed- 

 ing from before backward, first two pine-shaped plates turned 

 different ways, then two small roundish plates, then two more pine- 

 shaped plates, and finally a single la:|j^e irregular-shaped plate. 

 There are three pairs of broad, spatulate hairs, or scales, on the 

 hind margin ; and one pair on the antero-lateral angles. 



Hypopial Nymph (figs. 6 and 7). 



This, as before stated, has been carefully described by Kramer ; 

 and the almost precisely similar hypopial nymph of Dermacarus 

 sciurinus has been most elaborately described and figured by Haller ; 

 I therefore do not think it necessary to repeat the descriptions 

 here ; but for the benefit of those who cannot readily refer to the 

 papers of these Acarologists, and to complete the plates, I have 

 figured the hypopial nymph, which is an extremely interesting 

 creature. 



DiSPAEIPES EXHAMULATUS n. S. 



PI. XI. figs. 20-23. 



Average length, about 

 „ breadth ,, 



„ length of legs, ] st pair, about 

 )> )> }} 2nd „ 



J5 3> J5 OXU „ 



4th 



? 



• 18 mm. 



•14 „ 



•06 „ 



•07 „ 



•07 „ 

 •09 



14 mm, 



08 „ 



09 „ 



06 „ 



07 „ 

 06 



The main difierences from D. homhi beyond size are in itaKcs. 



