116 BULLETIN 46, UNITED STATES NATIONAL MUSEUM. 



Sulci of ventral plates distinct; last plate rather short, narrow, pos- 

 terior border ro'uuded. 



Second tarsal joint of all the legs, except anal pair, armed. Anal 

 legs rather long and stout; 10-13 spines on the snperior-.interior sur- 

 face of femora arranged in 3 series; within are 2 or 3 uniseriate spines; 

 beneath 7-9 spines arranged in 2 or 3 series; apical process with 0-8 

 spines. 



Femora of 13-20 pairs of legs armed with 4 or 5 spines at their exte- 

 rior apex, the posterior usually with 5 spines; femora of penultimate 

 pair of legs armed above with 1-3 spines. 



Posterior pleime with 9-12 apical spines and 1 or 2 marginal; above 

 on margin of dorsal plate are 2 small spines. 



Length of largest specimen KiO"" 1 '. 



This species is described from two adult and one young specimen 

 from Chatham Island, one young individual from James Island, and 

 another from Albemarle Island. The type is an adult from Chatham 

 Island. 



The five species belonging to this group of Xcolopcndra may be sep- 

 arated as follows: 



Femora of penultimate pair of legs armed ; first dorsal plate with a transverse sulcus. 



<i. Ventral plates not silicate; tibi;e of anal legs armed with spines PKASINA. 



a. Ventral plates with two longitudinal snlei. 

 ?). Last dorsal plate without a median earina. 

 c. Femora of last three pairs of legs armed ; tibia- of anal legs unarmed. VALID A. 



cc. Femora of all legs armed ; tibhe of anal legs armed GIGAS. 



Jib. Last dorsal plate with a median earina. 



d. Femora of penultimate pair of legs not armed above; spines at apex of 

 femora of 2-20 pairs of legs, 2 or 3; spines of apical process of anal 



legs, 1-3 ; spines of apex of anal pleura-. 1-3 VimmcottXis. 



(Id. Femora of penultimate pairs of legs with 1-3 spines above; spines of 

 apex of femora of 2-20 pail's of legs, 1 or 5; spines of apical process of 

 femora of anal legs, 6-8; spines of apex of anal pleura 1 , 9-12. 



GALAPAGOENSIS. 



7. Scolopendra sp. ? 



No. 591, Abrolhos Islands, lirazil. 



A very young specimen and unidentifiable. 



8. Heiiicops chilensis Gervais. 



HcnicopK fltUciiHis _ Gervais. Apteres, iv, 239. 1847 (Chile). 

 ]S"o. 593, Port Churruca, Straits of Magellan. 

 One young mutilated female. 

 Prosterual teeth, 4+1. 



