HISTORY OF LITERATURE. 21 



lie was a frequent and valuable contributor to 

 our knowledge of various families of the Acarina. 

 This paper contains descriptions of Glycyphagus. (Der- 

 macarus) sciurinus in all its stages, only the hypopial 

 nymph having been known previously, and gives its 

 life-history ; it also founds the genus Defmacarus for 

 the reception of this species and others having 

 homopial hypopi. It will be seen that I have not 

 retained this genus in this work, although I point out 

 that it may possibly be desirable to revive it some 

 day if further investigation should reveal certain 

 facts at present unknown. Haller in this paper also 

 devotes some space to what he considered a new spe- 

 cies, and called Tyroglyphus Megninii ; this, however, 

 was in reality only Rhizoglyphus echinopus, a very 

 variable species. He also describes as new a species 

 which he calls Tyroglyphus setiferus. Berlese is of 

 opinion that this is really T. longior. Haller also deals 

 more or less with homopial Hypopi in general, and 

 with the eggs of Acari, particularly Tyroglyphus and 

 Dermacarus ; furthermore, he devotes considerable 

 space to the internal anatomy of these two genera. 

 This portion of the paper is far from complete, and in 

 some respects is not as correct as Grudden's much 

 earlier paper, which is referred to above ; still it is 

 very useful, and is an honest attempt to deal with the 

 anatomy. Haller, doubtless, was not aware of Gudden's 

 paper. 



Prof. A. Berlese, in 1883, commenced his great work 

 on the Italian Acari, etc.,* which has been in course of 

 publication in parts ever since; it is still unfinished, 

 but the portion relative to the Tyroglyphidae is com- 

 plete. This publication is almost entirely classificatory, 

 and contains coloured illustrations of the species ; each 

 order (as it is called) has a summary and indexing 

 part. That on the Sarcoptidae,t including the Tyro- 



* " Acari Miriapodi e Scorpion! Italiani," Florence and Portici, 1883 

 1897. 



f " Ditto, Ordo cryptostigmata," Portici, 1897. 



