Synopsis of the Soutìi American species. 



1. l>jchanter with 2 strong protuberances, tibia with rather long 



stalk, nearly rouuded, inner side of femur nearly straight, outer 



side slightly convex, body very narrow . Oh. elongatus EU. 



Trochanter with only one strong protuberance, tibia with short stalk, 



inner side of femur more or less concave .... 2 



2. Femur strongly narrowing towards the extremity, palps slender, 



fingers only a little shorter than hand, rather slender. Ch. gra- 



cilis Eli. 



Femur not strongly narrowing, palps more robust, fingers very short 



and proportionally stronger 3 



3. Tibia subglobose, cephalothorax smooth. . Ch. nidificator Balz. 

 Tibia elongate, cephalothorax minutely granulated ... 4 



4. Smaller (3,8 min.), femur broader (ca. 2:4), fingers more curved. 



Ch. subrobustus Balz. 

 Larger (4,35 rum.), femur more slender (ca. 2:5), fingers less curved. 



Cu. robustus Balz. 



The specimens examined belonged ali to the common species: 



Chelifer nidificator Balzan. 



1890. Chelifer nidificator Balzan, Bev. d. Pseudoscorp., p. 417, tav. XIII, f. 5. 



1891. Atemnus nidificator Balzan, Ann. Soc. ent. Fr., voi. 60, p. 510, tab. 9, f. 1. 

 1902. Chelifer nidificator Balzan, Ellingsen, Pseudoscorp. de l'Equateur, p. 146. 



Paraguay: Puerto Bertoni (A. Bertoni de Winkelried) 26 specimens; 

 Argentine: Tala (Dr. A. Borelli) 6 specimens; Brazil: Matto Grosso; 

 Unicum (Dr. A. Borelli) 5 specimens. 



Ali the specimens, I have examined, have ali the tergites divided 

 longituilinally, except the last one. According to Balzan the 1 first 

 tergites shall be entire, and he does not mention the last one. Among 

 the specimens from Paraguay several were very small; these were very 

 pale, some of them nearly white, even the palps, but the shape of 

 these was pretty Constant. 



Subgenus: Lamprocìiernes. 



No eyes. One or two transverse grooves on the cephalothorax. Hairs 

 simple and denticulate. 



Synopsis of the Soutìi American species. 



1. Claws with a tooth, tibia of <f with a strong protuberance. Ch. 



cervus Balz. 



