ACAEINA 443 



1. GALTJMNA Heyden (Oribata Michael). Body shining black 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 01 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- mg Q9 Q-Ti a oar us nitidus 



ican species. (Banks) ; pseudostigmatic organ. 



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



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



3. SCUTOVERTEX Michael. Divisions between cephalothorax and 

 abdomen not very 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. NOTHRTTS 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. 



Fig. 097 Neoiwdes N. rugulosus Banks. Body dark brown and 



concentnca 

 (Banks). very rough, appearing like a piece of dirt: common 



under loose bark. 



5. NEOLIODES Berlese. Abdomen convex and very high, with con- 

 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. 



FAMILY 7. GAMASIDAE. 



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

 dibles usually ehelate, 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 



