Manchester Memoirs^ Vol. In. {\god>), No. ^. 3 



account of the presence of the median cephalothoracic 

 hairs which is a very exceptional character, I have 

 called this variety LoJunajinia insignis var. dissiiinlis. 



Glycypliagus spinipcs Koch. 



This species of mite and RJiizoglypJms eclmiopus are 

 members of the family Tyroglyphidae, of which the 

 typical and best known example is TyroglypJins siro, the 

 cheese mite. The group is one of considerable economic 

 importance on account of the damage for which many of 

 the members are responsible and the annoyance caused 

 by others on account of their enormous numbers. 



GlycypJiagus spinipcs {Text-fig. A) is similar in its habits 

 to its near relative G. doincsticiis de Geer, with which it 

 is often confused, especially as it has at first sight a 

 structural resemblance to that species. On careful 

 examination several important differences will be found. 

 The body of G. spinipes is constricted anterior to the 

 third pair of legs and is narrower behind this region, in 

 G. doinesticiis there is no such constriction. The slender 

 tarsi of G. spinipes are longer than those of G. doniesticus 

 and are covered with fine short hairs, hence the specific 

 name of this mite. G. spinipes also bears a small bract- 

 like scale on the third joint of the third leg (see Fig.) 



This species is pearly white in colour ; the males 

 measure about •5 mm. and the females 7mm. in length. 

 The body is covered with a large number of long and 

 finely pectinated hairs ; the number and arrangement of 

 these can be seen from the figure, the longest hairs are 

 those on the posterior half of the body. These mites are 

 able to run with considerable rapidity, and when they 

 occur they swarm in such substances as dried animal and 

 vegetable matter. I have received specimens in the 



