208 bulletin: museum of comparative zoology. 



Repugnatorial pores in line with suture which closely embraces it; 

 beginning on sixth somite. Suture obsolete across dorsum. Scobina 

 none. 



Anal scutum not exceeding the valves, though sometimes free at 

 apex; caudally somewhat narrowly but strongly rounded. Anal 

 valves mesally margined. 



In the gonopods of the male the median triangular plate is distally 

 broadly rounded, apex not mesally truly incised. 



Telopodites of first gonopods equalling this in length. The poste- 

 rior, seminiferous, gonopods extending normally conspicuously beyond 

 these, each in form of very broad thin plate with edges in subvertical 

 plane; the distal region expanded and bearing two slender, acute, and 

 widely diverging prongs the low?r of which, the seminiferous, is curved 

 at tip; above the lower branch a distally rounded lobe which ends at 

 the beginning of the curve. 



Number of segments, forty-six. 



Length, about 25 mm.; width, 2.1 mm. 



144. MiCROSPIROBOLUS FONTIS, Sp. UOV. 



Type. — M. C. Z. 4,426. Cuba: San Diego de los Banos, April, 

 1900. Palmer and Riley, April, 1900. 



A stouter species than M. helonanus from which it differs conspic- 

 uously in its darker color and the absence of the series of red spots. 

 The general color is dark brown with the segments bordered equally 

 with pale. Anal valves and scutum dark. Collum with a dark trans- 

 verse band behind the pale anterior border. 



The species is characterized by exceptionally small eyes, in which 

 the ocelli are few, small and pale, contrasting strongly with the eyes, 

 e. g., of M. helonanus. 



The collum extends a little below the level of the second tergite. 



The segments are considerably constricted, the caudal region more 

 elevated. At the bottom of the constriction of segments especially 

 in anterior region a sharply defined encircling sulcus. 



Anal valves exceeding the scutum. 



Number of segments forty-one. 



