18 BRITISH TYROGLYPHIDjE. 



In 1882 Kramer wrote a paper * upon an Acarus 

 which he had discovered, and which he called Tyrogly- 

 phus carpio. This creature is of interest as being the 

 type upon which the genus Histiogaster was subse- 

 quently founded ; although that genus, as ordinarily 

 defined, includes Laboulbene's long previously described 

 species, H. entomophagus. Berlese, however, considers 

 H. carpio as the only species of the genus Histiogaster, 

 and forms a new genus, Monieziella, to receive the other 

 species. I agree with Kramer in his latest work, where 

 he considers Berlese's genus unnecessary. 



In 1899 Lieferung 7 of the great German work 

 6 Das Tierreich ' was published ; the part was devoted 

 to the DemodicidaB and Sarcoptida3. The Tyrogly- 

 phidse are included, being treated as a sub-family of 

 the SarcoptidaB. This portion was the work of Dr. 

 Kramer, although the whole part bears the joint names 

 of Professor Canestrini and Dr. Kramer. According 

 to the scheme of ' Das Tierreich ' the TyroglyphidaB of 

 the world are dealt with, and a short description is 

 given of every recorded species believed by the author 

 to be a good one. It does not contain any illustrations 

 of species. It is unnecessary to say that this is an 

 extremely useful and valuable work, although it con- 

 tains several things which I am not able to agree with, 

 as will be seen in the course of this work, some of 

 which possibly Dr. Kramer might have reconsidered 

 had not the work been written so shortly before his 

 death. It does not contain anything relative to the 

 internal anatomy, habits, etc., the scope of the book 

 being purely systematic. 



P. Troupeau, in 1878, published a paper f on the 

 Acari found in flour, which contained an account of 

 some new species and some observations of general 

 interest. 



* " Ueber Tyroglyphus carpio eine nene art der Gattung Tyroglyphus, 

 Latr.," in 'Arch. Naturg.,' 1882, pp. 183186. 



f " Les Acariens de la farine," in ' Bull. Soc. Angers/ t. vi and vii, 

 p. 105. 



