ACARINA 



443 



Fig. 696 — Lia c aru s nitidiis 

 (Banks) ; pseudostigmatie organ. 



1. Galumna Heytlen {Oribata Michael). Body shining bhick or 

 brown in color, with a pair of horizontal wing-like expansions at the side 

 of the abdomen and with 3 claws on each foot: 21 American species; in 

 moss or on trees. 



G. pratensis Banks. Length .7 mm. ; yellowish-brown in color : often 

 common in meadows. 



G. emarginata Banks. Body dark 

 reddish-brown in color and .9 mm. long ; 

 wing emarginate below: often common 

 in moss, or on the ground. 



2. LiACARUS Michael. Body smooth, 

 last 3 pairs of legs inserted under the 

 body, each ending with 3 claws : 9 Amer- 

 ican species. 



L. nitidus Banks (Fig. 696). Body 1 mm. long, subspherical, shining 

 dark reddish-brown or black: under fallen leaves, stones, etc.; common. 



3. ScTJTOVERTEX Michael. Divisions between cephalothorax and 

 abdomen not veiy distinct; body rough and sculptured: 2 American 

 species. 



S. marinus Banks. Paired bristles on cephalothorax wanting: on 

 the rocks between tide marks on the Atlantic seashore. 



4. NOTHRUS Koch. Body rough and more or 

 less rectangular; back flat or concave; legs short, 

 thick, and rough, ending with 3 claws: 20 species, 

 which live in moss, on bark of trees, or on rocks, 7 

 American. 



N. excisus Banks. Length .7 mm.; most of the 

 hairs serrated: on the bark of spruce trees; New 

 York state. 



N. rugulosus Banks. Body dark brown and 

 very rough, appearing like a piece of dirt : common 

 under loose bark. 

 5. Neoliodes Berlese. Abdomen convex and very high, with eon- 

 centric rings; feet with 3 claws: 3 species. 



N. concentrica (Say) (Fig. 697). Body black, 1.5 mm. long; color 

 brown: on bark of trees; Europe. 



Fig. 697 — Neoliodes 



concentrica 



(Banks). 



Family 7. GAMASIDAE. 



Scavenger mites. Body broad, with short legs; eyes absent; man- 

 dibles usually chelate, and beneath them is a bifid hypostome; pedipalps 

 5-jointed and prominent ; legs 6-jointed and ending with 2 claws or with 

 a sucker; tracheae present, a pair of spiracles being located above the 



