TJUTHYREUS. 121 



chela when extended ; 2nd tarsal segment long, longer than the 

 three succeeding segments, 3rd segment wider than long, 4th about 

 twice as long as 3rd ; 5th, 6th, and 7th of approximately the same 

 length as the 4tb, and about as long as wide ; 8th long, considerably 

 longer than the preceding two, acuminate. Femur of 1st leg a 

 little thickened ; femur of 4th enormously thickened, especially at 

 the base, of 3rd less thickened than 4th, of 2nd less thickened than 

 3rd. Caudal sclerite with posterior heart-shaped expansion, the 

 narrow portion of the expanded portion directed posteriorly. 



$ . Resembling c? in general features, but with the apex of the 

 trochanter of the chela rectangular, not produced into a long spine, 

 and no spines or tubercles on the underside of the femur, tibia, or 

 protarsus ; caudal process cylindrical, without cordate expansion. 



Total length up to about 6 mm. 



Loc. Ceylon : in the Botanical Garden atPeradeniya (Tliivaites). 



Genus TRITHYREUS, Kraepelin. 



Tripeltis, Thorell, Ann. Mus. Genova, xxvii, p. 554, 1889; Kraep. 



Abh. Ver. Hamb, xv, p. 52, 1897 (norn. praeocc.). 

 Trithyreus, Kraep. Tierr., Scorp. etc. p. 234, 1899 (March). 

 Triplomus, Cook, Proc. Ent. Soc. Wash, iv, pp. 250 & 255, 1899 



(April). 



Differs from Schizomus in that the posterior dorsal plate of the 

 cephalothorax is not uniformly chitinized and pigmented through- 

 out, but is either completely divided into a right and left quadrate 

 portion (according to Thorell and Kraepelin), or is, at all events, 

 marked with a narrow, pellucid, unpigmented submembranous 

 median area, impressed with the sutural line observable in 

 Schizomus, In all the known specimens, which are perhaps 

 females, the chelae are unarmed, and the caudal sclerite is cylindrical 

 as in the female of Schizomus crassicaudaLus. 



Distribution. Ceylon ; Burma ; also Bismarck Archipelago. 



Synopsis of Indian Species. 



a. Posterior dorsal plate of cephalothorax 

 marked with a narrow median suture ; 

 apex of trochanter of chela rectangular, 



scarcely produced T. suboculatus, p. 121. 



b. Posterior dorsal plate of cephalothorax with 



a broad median divisional line ; trochanter 

 of chela apically produced and upturned 

 (according to Kraepelin and Thorell). 

 a"-. Without eyes ; chelae one and a half 



times the length of the cephalothorax . . T. grassii, p. 122. 

 b 1 . With a pair of eye-spots ; chelse a little 



longer than the cephalothorax T. cambridgii, p. 122. 



102. Trithyreus suboculatus, sp. n. 



Resembling the female of Schizomus crassicaudatus in general 

 features. Colour a yellowish olive-green on the carapace and 

 abdomen, legs and chelse paler, nearly flavous. Anterior end of 



