14 NATHAN BANKS. 



Their often roughened appeurance and short legs give them a 

 strange liabitus. They are found in various situations, in moss (es- 

 pecially Sphagnum), under bark, on trees, etc They move very 

 slowly, and when disturbed will often lie still for several minutes. 



1. — A pair of curved hairs at tij) of c'ei)halothorax 2. 



No such hairs 4. 



2. — With only simple hairs at tip of abdomen fii i'<*atii«. 



Clavate hairs at tip of abdomen 3. 



3. — Tip of abdomen deeply excised exciMiiM. 



Tip of abdomen barely excised rii$;ul<»sii«. 



4. — With short clavate haii-s at each posterior angle of abdomen. . .triiiivatiiN. 



With long simple hairs at each angle of abdomen bi|>ilis. 



NotliriiK Iriiiicatiis nov. sp.— Length .7-.8 mm. Dark reddish, younger 

 specimens yellowish, with a dark central spot ; body quite high behind ; dorsum 

 convex, finely granulate : cephalothorax quite long, triangular, contracted above 

 first pair of legs, with a median suture, no hairs in front, a short clavate one each 

 side close to the stigmata, setse of stigmata long and simple ; abdomen wider 

 behind, sides slightly sinuate, truncate in front and behind, margin elevated, a 

 sul)-mai'ginal ridge converging near tip, a sub-marginal and a sub-median row of 

 five clavate haire. at each iiosterior angle a large clavate hair, and a pair of smaller 

 ones near the middle of tip, sides of abdomen smooth ; the legs are stout, with a 

 few stiif hairs, finer near the tips. Young" specimens are paler and have a lower 

 abdomen. 



Sea Cliff, L. I., N. Y. Several specimens from Sphagnum, one 

 in some moss on a rock, another under decaying sod. 



Nothrns bi|>ilii!>» nov. sp.— Length 1. mm. Dark reddish, sides and venter 

 paler. Similar to N. truncatus, but the abdomen much broader and higher, the 

 side piece of abdomen being nearly as high behind as it is long ; at each posterior 

 angle of the abdomen, instead of the short clavate hair as in N. trimcntaH. is a very 

 long, curved, simple hair ; the genital and anal openings are l)roader than in the 

 preceding species. 



Sea Cliff, L. I., N. Y. One adult and two yoiuig specimens from 

 Sphagnum. 



9fothrus fureatus nov. sp. — Length .7 mm. Reddish brown ; body flat ; 

 dorsum smooth ; cephalothorax triangular, narrowed behind, with a curved ridge 

 each side, two stiff curved liairs in front and two bristles above, seta quite long, 

 not clavate ; abdomen gradually growing wider, base truncate, tip broadly 

 rounded, crenulate and bearing eight curved bristles, four bristles on each side 

 margin ; above, a sub-marginal ridge each side reaching from base to near poste- 

 rior angles, between their tips a curved, transverse, sub-apical ridge, in the centre 

 of dorsum a forked ridge reaching from base to near suli-apical ridge, four simple 

 hairs arise from each branch of the fork, a few simiile hairs at base of dorsum ; 

 legs stout with short, stiff, curved bristles. 



Olvmpia, Wash. [Trevor Kincaid]. Several specimens. 



