116 BULLETIN 46, UNITED STATES NATIONAL MUSEUM. 



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

 terior border rounded. 



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

 legs rather long and stout; 10-13 spines on the superior-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 6-8 

 spines. 



Femora of 2-20 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 pleurae with 9-12 apical spines and 1 or 2 marginal; above 

 on margin of dorsal plate are 2 small spines. 

 Length of largest specimen 160 mm . 



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 Seolopendra may be sep- 

 arated as follows : 

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



a. Ventral plates not sulcate; tibiae of anal legs armed with spines Prasina. 



aa. Ventral plates with two longitudinal sulci. 

 b. Last dorsal plate without a median carina. 

 o. Femora of last three pairs of legs armed ; tibise of anal legs unarmed. Valida. 



cc. Femora of all legs armed ; tibise of anal legs armed Gigas. 



bb. Last dorsal plate with a median carina. 



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 pleurae, 1-3 Viridicornis. 



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

 apex of femora of 2-20 pairs of legs, 4 or 5; spines of apical process of 

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



Galapagoensis. 



7. Seolopendra sp. ? 



No. 591, Abrolhos Islands, Brazil. 



A very young specimen and unidentifiable. 



8. Henicops chilensis Gervais. 



Henicops chilensis Gervais. Apteres, iv, 239, 1847 (Chile). 



Xo. 593, Port Churruca, Straits of Magellan. 

 One young mutilated female. 

 Prosternal teeth, 4+1. 



