10 PROCEEDINGS ENTOMOLOGICAL SOCIETY 



genital opening is only a little behind the suture behind coxae II; in 

 front of this suture is a line each side, and behind it is a shorter one; 

 the line to the hind coxae not distinct. 



Length, 0.4 mm. 



Many specimens sent by Prof. C. E. Sanborn from Still- 

 water, Oklahoma. 



Liacarus medialis, new species. 



Brown; legs paler, and a pale spot at base of abdomen and also on 

 middle area of the cephalothorax. Cephalothorax very small, subtri- 

 angular, a lamella each side, meeting at tip, and a narrower outer lam- 

 ella which at tip has a fine hair; superior bristles long, suberect, pseudo- 

 stigmatic organ rather long, enlarged at the middle. Abdomen elon- 

 gate, narrowed behind, shoulders weakly margined: two simple, humeral 

 bristles and one behind them ; on each posterior side margin are four 

 long, simple hairs, and above is a row of three each side. Three com- 

 plete lines on coxal plate, hind coxae distinctly outlined behind, indented 

 by the genital aperture, which is broader than long and fully two and 

 one-half times its length in front of the very much larger anal opening 

 the latter twice as long as the genital and a little longer than broad. 

 Legs slender, mostly with simple hairs, a stouter spine-like one from 

 patellae I and II; femur 1 1 broad and angled near tip, three unequal claws. 



Length, 0.8 mm. 

 Falls Church, Virginia. 



Oribata consimilis, new species. 



In general appearance very similar to O. (Belba] minuta Bks., but 

 easily known therefrom by the short pseudostigmatic organ, very strongly 

 clavate at tip; in O. minuta it is nearly twice as long and only feebly 

 clavate at tip. The cephalothorax has three fine, simple hairs each side; 

 the abdomen has two rows each side, each row of four or five long, curved 

 simple bristles: rather larger than in O. tninuta; there are six or eight much 

 smaller ones rather closer together near the tip of the body. The legs 

 are rather longer than in O. minuta, and are provided with long, simple 

 hairs; the hind tarsi are plainly longer than tibia plus patella (in O. 

 minuta barely longer). The genital aperture is about once and a half 

 its length in front of the much larger anal opening. 



Length, 0.5 mm. 



From Great Falls, Virginia. 



Nothrus terminalis, new species. 



Pale yellowish-brown throughout. Cephalothorax constricted over 

 coxae I, tip truncate, with two very small curved bristles; pseudostig- 

 matic organ a long, simple bristle; near its base is a scale-like hair. Ab- 

 domen fully twice as long as broad, rather broader behind than at mid- 



