CHEESE MITES, ETC. 257 



CASE and Fumouse and Robin's character should be taken. Claparede's 

 characters will not apply to their species, but their character will 

 apply to both, and distinguish the little group composed of them 

 sharply from Tyroglyphus. 



Nos. 7, Rhizoglyphus echinopus (Hypopus dujardinii, Clap.), — 7. Magnified 

 sketch of larva and pupa ; 8. Magnified sketch of supposed male (Hy- 

 popus) ; 9. Magnified sketch of female. All copied from Claparede's 

 figures. (Tyroglyphus echinopus, Fum. &= Rob., Joum. Anat. and 

 Phys. de M. Robin, 1868) ; 10. Magnified sketch of ditto, copied from 

 Robin's figure. (? Acarus hyacinthi, Boisd. Ent. Hort., p. Z^.) 



Besides the generic character above 

 noticed, the most notable points in 

 this species are more numerous bristles 

 about its feet than in other species, and 

 a more globose body, there being no 

 drawing in of the flanks, as is often, 

 more or less, seen in other species. As 

 we have already said, under Hypopus, 

 Claparede's and Robin's species are the 

 same. There can be little doubt that Larva of Rhizogiyphus echinopus. 



Copied from Fumouse's figure. 



the species noticed (in th.e same year) 



by Boisduval in his " Entomologie horticole," under the name of 

 Acarus hyacinthi, also belongs to this, although the absence of any 

 description prevents our saying so with certainty. 



The habits of their species, as observed by all three authors, 

 were identical. They live between the scales of some species of 

 Liliacece, principally hyacinths. M. Boisduval adds, that in some 

 years they are very abundant in autumn, and occasionally cause 

 itching and irritation to those persons who handle a great number 

 of the bulbs. 



It is not improbable, however, that it is only because the 

 hyacinth bulbs are more exposed to view than the roots of other 



