WITH THE DESCRIPTION OF NEW AFRICAN SPECIES. 



439 



the first pair with the tarsal joints, eight in number, swollen ; the third, with about twelve 

 tarsal joints scarcely swollen. Coxae smoothish, the last pair not very large. (PI. 24, fig. 3.) 

 Length of body, 20"; of first pair of legs, 1.00; of second pair, 2.40"; of third pair, 

 1.5" ; of fourth pair, 1 



Remarks. — A single specimen in a bottle containing several species, and labelled " Ecua- 

 dor, except one from Peru." 



0. ferox, n. sp. 



Dorsum light reddish-brown, provided on its posterior portion with a very long, slender 

 spine, whose base is somewhat tubcrculate, and whose length almost equals that of the 

 dorsum ; anterior to this spine is a pair of large umbonations or obtuse elevations, sur- 

 rounded by a marked groove or furrow, on which are two or three small eye-like tuber- 

 cles. Eyes very widely separated, each on a pcdiclcdikc eminence. Placed centrally, and 

 a little in front of the eyes, occupying about the position of the usual eye-eminence of the 

 phalangia, is a marked, conical elevation surmounted by two or three eye-like tubercles, 

 and having several similar ones scattered about its base. Distal joint of the maxilla; reni- 

 form, laterally attached, presenting a very narrow face or obtuse edge anteriorly. Palpi 

 nearly three times as long as the body, very slender, excepting their two distal joints, 

 which arc so flattened as to present a broad, inferior face, and are armed on each of their 

 two edges, the one with five or six long, moderately-robust, curved, very acute spines, 

 the other with about three similar spines and several smaller ones ; the movable finger 

 very long, curved, acute, so moving as to play between the rows of marginal spines against 

 the broad surface. Pectus and coxae with rows of large tubercles. Last pair of legs about 

 an inch and a half long, very slender. (PL 24, fig. 8.) 



Remarks, — The legs of the only specimen I have seen, are so broken that it is impossi- 

 ble to determine the generic characters. The agreement, however, in general appearance, 

 in the wide separation of the eyes, in the last article of the maxillae, &c, with O. bilu- 

 nata, have induced me to class the species together. The specimen is labelled: "Napo 

 and Maravon," indicating its having been taken, 1 suppose, in journeying from one 

 place to the other. 



OcTorHTiiALMUS, new genus. 

 Eyes, four on each side of the eye-eminence. Last article of mandibles attached by 

 its end. Tarsal joints I 



