280 



Transactions. 



Legs,— 



1 



2 



3 



4 

 Palpi 



One dried specimen in the British Museum (the abdomen and front 

 pairs of legs missing), and parts of two others (smaller), one with much 

 shorter but similar-shaped mandibles. This might be a sexual or age dif- 

 ference, but it is impossible to distinguish the sex of any of them. 



Trioenonyx testaceus, nov. sp. 



Carapace orange. Eye-tubercle yellow, with two black patches between 

 the eyes. Mandibles pale yellow. Abdomen orange, transversely striped 

 witli black on the posterior segments. Legs very pale yellow. 



The carapace, including the ocular tubercle, which is quite terminal, 

 is very finely granulated, almost smooth, and with no tubercles or spines. 

 The eyes are yellow, and situated nearly at the apex of their tubercle. On 

 the upper side of the abdomen there is a transverse row of fine spines on 

 each segment. On the under-side the segments are finely granulated and 

 without tubercles. 



The mandibles have the first joint smooth, the second with a median 

 row of spinous bristles 

 down the front and 

 spines round the ante- 

 rior margin ; the fingers 

 just cross one another 

 at the points. 



Palpi : The coxa has 

 two large spinous tu- 

 bercles on the tmder- 

 side. The trochanter 

 has one similar. The 

 femur has on the under- 

 side two large spinous 

 tubercles at the base 

 and one small about 

 the middle, on the 

 upper side a median 

 row of small tubercles 

 and red mottlings on 

 the yellow ground. The 

 patella is smooth. The 



tibia has two long spinous tubercles on the inner side and one short one in 

 front. The tarsus has two inner and three outer spines. 



The coxae of the first pair of legs have two large spinous tubercles on the 

 under-side, and there are smaller spinous tubercles on those of pairs 2 

 and 3. 



The maxillary process at the base of the second leg is double, the inner 

 segment being twice as high as the other. The tarsal segments are 4, 10, 

 5, 5. 



a. 



Fig. 6. — Trioenonyx testaceus. 



Enlarged ; x 2. h. Sternal and coxal area of under-side 

 of thorax. 



