LYCHAS. 35 



Genus LYCHAS, C. Koch. 



Lychas, C. Koch, Arachn. xii, p. 3, 1845 (in part). 

 Archisometrus, Kraepelin, Jb. Hamb. tciss. Anst. viii, p. 217, 1891 ; 

 id. Tien-., Scorp. etc. p. 41, 1899. 



Carapace without posterior and lateral keels; anteocular area 

 horizontal. Terga with two or three crests. Tail carinate ; a 

 conspicuous triangular tooth on vesicle beneath the aculeus. Man- 

 dible with one inferior tooth on the immovable finger. Chela with 

 movable finger armed with numerous rows of teeth set end to end, 

 not overlapping ; also with an inner set of larger teeth, each set 

 close to the distal end of the rows of the median series, and with 

 an outer set composed of pairs of larger teeth, set close to the 

 posterior ends of the median rows. Sternum triangular, longer 

 than wide. 



Type, L. scutilus, C. Koch. 



Distribution. Tropical Africa ; India to Australia. 



The genus Lyclias was based upon two species, L. maculalus and 

 L. scutilus. The first had already been made the type of the 

 genus Isometrus by Hemprich and Ehrenberg. Hence scutilus 

 becomes the type of Lychas. 



Synoptic of Indian Species. 



<a. Abdominal sterna coriaceous, the 4th and 5th 

 granular throughout ; pectinal teeth 12 ; 

 tarsi bearing two rows of bristles beneath. . L. rugosus, p. 39. 

 .b. Abdominal sterna, with the exception of the 

 5th, smooth and polished ; pectinal teeth 

 15-25 ; tarsi with pad of bristles. 

 .a 1 . Tibial spurs of 3rd and 4th legs very long, 

 much longer than the hairs on the seg- 

 ments. 



.a 2 . Carapace evenly granular throughout. 

 a 3 . Terga with three distinct ' keels ; 

 underhand nearly as long as the 



movable finger L. tn'carinatus p. 40. 



b 3 . Terga with a single median keel; 

 underhand only about hah" the 



length of the movable finger L. hendersoni, p. 40. 



If. Frontal area of carapace nearly smooth 

 or studded in front with a few large 

 granules. 



'. Terga with large tubercle on each 

 side, forming a small lateral crest; 

 legs and chelae uniformly yellow ... L. shoplandi, p, 41. 

 .b 4 . Terga without trace of lateral crest ; 



legs variegated with black. 



a s . Chelae yellow ; tail mostly yellow . L. l<evifrons, p. 41. 

 tf. Chete with hand entirely black, 

 brachiuia black above ; tail al- 

 most wholly black L. fees. p. 42. 



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