i. veil as. 35 



Genua LYCHAS, C. Koch. 



Lychas, C. Koch, Arackn. xii, p. •">, 1845 (in part). 

 Archisonietrus, Kraepelin, Jb. Hamb. wise. Anst. viii, p. -\7, 1891; 

 id. Tierr., 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 interior 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 mediau 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 Lychas was based upon two species, L. maculatus 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. 



Synopsis of Indian Species. 



/(. Abdominal sterna coriaceous, the 4th and 5th 

 granular throughout; pectinal teeth Ji } ; 

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

 i>. Abdominal sterna, with the exception of the 

 5th, smooth and polished ; pectinal teeth 

 15 25 ; tarsi with pad of bristles. 

 u [ . Tibial spurs of 3rd and 4th legs very long, 

 much longer than tin; hairs on the seg- 

 ments. 

 a-. < larapace evenly granular throughout. 

 a 3 . Terga with three distinct keels ; 

 underhand nearly as long as the 



movable linger L. tricarinatvs p. 40. 



//'. Terga with a single median keel: 

 underhand only about half the 



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



b 2 . Frontal area of carapace nearly smooth 



or studded in front with a few large 



granules. 



n'. Terga with large tubercle on each 



side, forming a small lateral crest; 



legs and cliche uniformly yellow ... L. slwj/landi, p, 41. 

 V. Terga without trace of lateral crest; 

 legs variegated with black. 

 O 6 . Chelae yellow: tail mostly yellow . L. l<, wifrons, p. 41. 

 b h . Cliche with hand entirely black, 

 brachiuui black above : tail al- 

 most \\ holly black L. fern, p. 42. 



n -J 



