318 ME. E. I. POCOCK OlS" THE AEACHNIDA 



almost exactly as in Selenocosmia javanensis, but a little closer 

 together. 



Mandibles similar to, but a little weaker than, those of Seleno- 

 cosmia javanensis, unarmed in front ; maxillcd also as in that 

 species. 



Falpi and legs shorter and more robust than in Selenocosmia ; 

 distal tarsal segments scopulate, the proximal tarsal completely 

 scopulate on the first pair, nearly completely on the second, half 

 covered on the third, and with only its distal third so furnished 

 on the fourth. All the scopulse very large and undivided, excep 

 those on the proximal tarsal of the fourth pair of legs, which 

 are in two complete halves. A single sharp black spine on 

 each side of the lower surface of the distal extremity of the 

 tibial segments of each pair of appendages ; for the rest the seg- 

 ments are unarmed, except for the two terminal claws. The 

 first leg a little shorter than the fourth. 



Sternum considerably longer than wide ; the labium defined 

 behind by a deep groove, nearly twice as wide as long, convex 

 along its free border, and not quadrate. 



The aidomen rounded or ovate. 



The posterior spinners short, not so long as the patella of the 

 third pair of legs, and less than a third of the length of the 

 cephalothorax ; the segments subequal in length. 



Measurements in millimetres. — Length of cephalothorax 25*5, 

 width 21, of cephalic portion 13"5 ; distance of fovea from an- 

 terior margin 17 ; width of ocular tubercle 3'3 ; length of 

 abdomen 30, width 22, height 19 ; length of sternum 12'5, 

 width 19 ; width of labium 3'5, length 2'5 ; length of appendages 

 (including coxal segments), palp 52'5, 1st leg 74, 2nd 67*5, 3rd 55, 

 4th 74, length of superior mantilla 7'5. 



Sah. Mergui. Dr. Anderson obtained several examples of 

 this fine spider. They were discovered beneath large stonet^, 

 squatting with their egg-cases in shallow excavations of the soil. 



According to Simon's recent revision of the Theraphosse, the 

 genus falls into the tribe Tlierapliosce of the subfamily Avicu- 

 larincB. It cannot, however, be confounded with any of the 

 genera of this tribe. 



EXPLANATION OF PLATE XXII. 



Fig. L Ornithoctonus Andersoni, gen. et sp. nov. ; nat. size, from above. 



2. Lower surface of cephalothorax ; nat. size. 



3. Ocular tubercle, enlarged. 



