32 Uniirrsity of Michigan 



excepting a narrow caudal border on each side and anal valves 

 nearly black or black of olive tinge. Legs brown, lighter than 

 in ctJiola.v. 



Most easily separated from ctholax by readily noted dif- 

 ferences in the collum. The inferoanterior corner in the 

 female is not obtuse, but is moderately extended forward as 

 shown in PI. 15, Fig. 98. The collum lacks the oblique fur- 

 row above the striae proper, and the next to the uppermost 

 stria is short, crossing only the caudal border as shown in the 

 figure. Five striae are present above the margining sulcus. 



Segmental suture deeply impressed, widely curving oppo- 

 site the pore, which is a little in front of a point halfway 

 between suture and caudal edge of dark portion of metazonite. 



In the type there are two transverse furrows in front of 

 the tip of the last tergite. Anal valves w^ith mesal borders 

 elevated as usual. Anal scale longer in proportion to width 

 than in etholax. (PI. 14, Fig. 97.) 



Number of segments, 61. 

 Length, about 95 mm. ; width, 6.5 mm. 

 British Guiana: First Mourie; July 30 and Aug. i. 1914: 

 F. M. Gaige. One female on each date. Holotype, ^l. C. Z., 

 5,101. 



Orthoporus gaigei, sp. nov. 

 PI. 15, Figs. 99-103; PI. 16, Fig. 104 



Segments typically mostly blackish brown or black, except- 

 ing a narrow ferruginous ring about caudal border of each 

 and the covered por'ion of prozonite, which is also pale. Ante- 

 rior border of anal valves typically jialest. 1 lead and collum 

 often in large part chestnut or ferruginous. Antennae and 

 legs ferruginous. 



V^ertigial sulcus of head sharjil}- impressed, ending in .1 



