TABLE OF THE GENERA. \f 



four subequal bristles on the cephalothorax, and the bristles at tip of 

 abdomen are as long as body; moreover, these bristles are provided 

 with line, short hairs. In fact, it agrees very well with Michael's 

 figure of T. Ion(/w)\ except that the abdominal bristles are not quite 

 so long. Michael, however, figures the tarsus of this species as much 

 shorter than figured by Canestrini and in my specimens of T. longior. 



Michael, in detail figure of Aleurohius far/nse., male leg I, shows the 

 clavate hair arising from tip of tibia, whereas it should be from basal 

 part of tarsus; at least it is so in \\\y specimens and so figured by 

 Berlese. Michael figures Alenrobhu farlmv with but two long poste- 

 rior bristles on the cephalothorax; Canestrini shows four of these, 

 but no long humeral bristle, as in Michael. My specimens have the 

 humeral bristle like Michael's figure and the cephalic as figured b}- 

 Canestrini. Berlese figures six cephalic bristles, besides the frontal, on 

 this species. Berlese figures the hind tarsi of male Aleurohivsfarinse 

 with suckers far apart. My specimens agree with Michael in this 

 respect. Michael considers that, his Carpoglyphus anonymiis is the 

 same as Phycohius anonymus of Canestrini and Trlchodactylus anony- 

 mvs of Berlese; yet Michael's figures show numerous difi^erences from 

 their figures. Michael, for example, shows short spines on the body, 

 while they figure simple hairs. 



In view of these and other discrepancies among European authors, 

 I have been sorely tempted to abandon all attempts at identification 

 and describe everything as new. However, I believe that we have 

 Tyroglyphus longior^ T. {Aleurobius) /'arirne, and Carpoglyplius pas- 

 sularuin in this country, and I should like to think that what I have 

 described below as T. aiaericanus was the real T. i<!r<), but it certainly 

 is not the T. siro of Michael, the latest writer on the European fauna. 



GENERA OF THE TYROGLYPHID^. 



The genera known to me as occurring in the United States may be 

 separated by the following table. Various other genera are known 

 in Europe, and some of them, and possibly new genera, will be found 

 in our country when it is examined more thoroly for these mites. 

 The forms thus far collected are mostly of economic' value, and have 

 been sent to this Department by various persons during the past 

 twenty-five years. 



TABLE OF THE GENERA. 



1. Dorsal tegument more or less granular; claws very weak, almost invisible; 



some hairs of body plainly feathered; ventral apertures very large. . Glyciphagus. 

 Dorsal tegument not granular; claws distinct; no prominent feathered hairs; 

 ventral apertures small 2 



2. Mandibles not chelate, elongate and toothed below; body without long hairs; 



palpi enlarged at tip and provided with two divergent bristles Histiostoma, 



Mandibles chelate; palpi not enlarged at tip, nor with the two bristles 3 



