129 



backwards and slightly outwards. The following abdominal lergites bear a similar 

 lateral spine, increasing in lenght towards the sixth lergite; the corresponding 

 spines of the three following tergites (VII— IX) are smaller and less prominent, 

 that of the tenth scarcely visible. These spines correspond probably to the keels 

 already described of the other previously mentioned forms, even if the sides of 

 the first tergites show low lateral elevations beneath these spines (cf. below). 



6. Ch. lampropsalis L. K. sp. aff. — The three first abdominal tergites with 

 slightly marked elevations, above which a well developed free backwards directed 

 spine is found; the second thoracic tergite bears a similar one; the lateral eleva- 

 tions beneath these spines are not found in the hindmost tergites, and the spines 

 decrease towards the eighth abdominal tergite, in which it is almost obsolete. 



7. Ch. lampropsalis L. K. — The lateral margins are slightly raised, but scar- 

 cely much more than in most other forms of Chelifer Geof. 



Other forms like Ch. Socotrensis With have the tergites without any keels 

 like Ch. lampropsalis L. K. as well as the females of all species with the exception 

 of Ch. scnlpturatiis Lewis, in which the female bears more or less marked lateral 

 projections on the tergites, while the male has the corresponding keels powerfully 

 developed (cf. 21. pp. 117 and 120). 



A sexual character of a somewhat différent nature is found in the tergites of 

 the males of Ch. segmentidentatus Balz., in which the posterior margin of the ter- 

 gites is serrated (46. p. 428, tav. XV, fig. 13 d*). 



Sternal spines'). — In Ch. subruber Sim. and Ch. Murraiji Poc. a very remar- 

 kable sexual character is found in the proximal sternites, which are in the male 

 beset with a number of short well articulated spines, arranged in a somewhat 

 dilîerent way in the two species; as far as details are concerned, I refer to the 

 description of these species and to pi. Ill, fig. 8, sp. 



Galea. — One of the sexual differences, which is of most practical value and 

 which is present in almost all forms, is that found in the size of the galea, com- 

 pared with the terminal curved hair of the movable finger. Canestrini observed, 

 that the galea is poorly developed in some specimens, but highly developed in 

 others, but he believed that this difference was one of age (42. Fasc. VII). Thorell 

 has also mentioned short and long galeae in the same species f. inst. in Ch. Java- 

 mis Thor. (1882. 6. p. 38), but seems not to have understood the sexual character 

 of this difference. Balzan (1890. 46. p. 412) saw, that the galea differs according to 

 the sex, but later on (1891. 12. p. 500) he expressed the opinion, that a sexual 

 difference in the galea is only found in species belonging to Trachychernes Tom. 

 and Chelifer Geof., not in the other subgenera. In this I can not completely agree 

 with him, for in all Asiatic species examined by me a sexual character is found 



') Ed. Ellingsen has in a paper (72. pp. 13, 14 and 10), of which 1 received a copy during tlic prin- 

 ting of this treatise, observed and described sternal spines in a number of African species viz. Ch. ançiii- 

 laliis Ell., Ch. Simoni lîalz. and Ch. temiinuinus Balz., but has not mentioned the slructure of the arti- 

 culation between the two femoral parts in the first pair of legs. 



I). K 1) Viilensk Sdsli. Ski-., 7. Dii-Ul»'. n:ilurviilcnsli. ci;; m:ithpm Afil. 111. 1. 17 



