chambeblin: icybiopodji of the Australian region. 129 



acute spur arising from the base <>l the more distal branch, the two 

 distal branches in the form of moderately curved blades extending 

 mesad nearly at right angles to the principal axis. 



The first legs of the male thickened and strongly uncate; of the 

 form of tlio>e of Antichiropus, the third joint bent and showing on the 



mesa! side a thumb-like process. Tarsi of anterior legs with a dense; 



pad of haii- beneath as in that genus. 

 Gi woTYPE. S. fuscipes, sp. n<>\. 



:;.")("». SOMETHUS FUSCIPES, sp. nov. 



Type. -M. C. Z. 4,684. Paratype.— M. C. Z. 4*685. Australia 

 | Henry Edwards). 



The genera] color is a dark grey, in part of brownish tinge or dusky. Collurn 

 and vertex of head black. Legs and antennae brown to fuseous. 



Yertigial sulcus sharply impressed down to level of antennae. Antennae 

 slender, the second and third joints somewhat longest. 



Collum well rounded on each side. Each anterior corner oblique, anterior 

 margin straight at middle. Caudal margin straight. Margined laterally 

 and along oblique part of anterior margin. 



All keels set off above by a sharply impressed longitudinal furrow; mostly 

 thick, especially the porigerous ones. Tergites from fifth to seventeenth 

 with a weak transverse sulcus. 



The cauda short and broad, plate-like, caudally truncate. Valves sharply 

 margined. Last sternite or scale subtriangular, the sides strongly convex. 



In the gonopods of the male the basal spur of the telopodite is a thin lanceo- 

 late blade narrowed at each end, a little twisted and extending distad parallel 

 to telopodite proper. The two distal branches are flat blades; of these the 

 more proximal (seminiferous) curves but little and extends almost directly 

 mesad across the middle line, while the distal blade curves obliquely meso- 

 caudad across and above the other one. There is a short angular process 

 above the base of the distal branch. 



Length (male), near 30 mm.; width, 2.8 mm. 



Antisoma, gen. nov. 



Composed of head and nineteen segments. 



Antennae long and slender; second and third articles longest, the 

 fourth, fifth, and sixth much shorter, subequal. 



Segments narrowing in going from the middle forward to the head, 

 the anterior ones much narrowest. First tergite of ordinary form. 



