neio Oriental Opilione?. 291 



behind by a semilunar genital plate, which is fused behind 

 with the first abdominal sternite. T say that the coxge appa- 

 rently meet each other in front of the genital aperture, because 

 there appears to be no distinct suture, only integumental folds, 

 between their main portions and their inwardly-directed pro- 

 cesses. From a comparison of the figures of the coxal areas 

 of S. Uonotus and Pettalus hrachyurus it seems that the 

 maxillary lobes of the legs of the first pair in the former are 

 not represented in the latter, where the maxillary lobes of 

 the palpus appear to be the only organs that can be called 

 lips, and that the pentagonal plate with its two elevations 

 that lies in Pettalus between the coxte of the second, third, 

 and fourth pairs of legs and before the genital aperture is 

 represented in Stylocellus by the minute sternal plate and by 

 the inwardly-directed pregenital coxal lobes of the fourth 

 legs. But whether in the case of the Stylocellus the coxge 

 have grown inwards and obliterated the sternal area of Pet- 

 talus, or whether they have merely fused with it, I cannot at 

 present say. In Siro {cf. Thorell, Ann. Mus. Genov. xviii. 

 1882, p. 24, in note) there is a largish sternal plate lying longi- 

 tudinally between the coxte of the first, second, and third pairs 

 of legs at the sides, the genital aperture behind, and the apex 

 of the stomotheca in front. Siro, therefore, is in some respects 

 intermediate between Pettalus and Stylocellus. 



Stylocellus Uonotus, sp. n. 



Colour of trunk black, of appendages very deep ferruginous. 



Upper surface of trunk and lower surface of abdomen 

 smooth ; coxa? mesially granular below, the first more thickly 

 so than the others. 



Body about twice as long as wide. 



The sessile eyes situated some distance — t. e. by a space 

 that slightly excels their diameter — in front of the ocular 

 tubercle. 



Mandihles nearly as long as the palpi ; basal segment 

 thickly granular below and bearing two tubercles, one at the 

 base, the other in the middle of their length, towards the 

 outside of the lower surface ; the second segment granular 

 above at the base, smooth and polished elsewhere. 



The legs and other organs apparently as in S. sumatranuSj 

 Westw. (Thcs. Ent. Oxon. p. 200, 1874). 



Measurements in millimetres. — Total length 6 ; width 3 ; 

 height 2-2 ; length of first leg 9, of second 6'3, of third 6*5, 

 of fourth 8-8. 



21* 



