'7Q [March, 



angular ; finger widest beyond centre, of the same general outline as 

 in gallinae, but the apical mai'gin very strongly slanting, therefore the 

 posterior apical angle pointed ; six bristles in apical half of posterior 

 margin, first, second, and fourth short, the others nearly equal in 

 length (being slightly shorter than the finger is bi'oad). Apical 

 portion of end-piece of paramere slender and scarcely at all curved. 



$ . Apical margin of seventh sternite (fig. 32 j oblique, some parts 

 of it more rounded than others, the margin being ventrally less ob'ique 

 than dorsally. Eighth tergite with five or more (usually 10 or 11) 

 bristles below the stigma, the last bristle being placed proximally to 

 the upper angle of the widened portion of the segment ; on the ventral 

 area about 18 bristles. Stylet twice as long as it is broad. Head of 

 receptaculum seminis long, nearly three times as long as it is broad, 

 and more than twice as long as the tail. 



A rare species found in the nests of seabirds, such as the kitti- 

 wake {Bissa tridactyla) and the herring gull {Lams argentatus) in 

 Scotland. Of doubtful occurrence in England, and not recorded from 

 Ireland. 



17. Cekatophyllus borealis Boths. (1907). 



(Figs. 33, 34). 



An almost black species. It resembles garei, but the hindfemur 

 has a row of only three to five bristles on the inner surface and the 

 modified abdominal segments are different. 



^ . Area of sharp points on inside of eighth tergite one-fourth 

 narrower than the finger, this segment posteriorly to stigma with 12 

 bristles, of which four are placed at or close to the edge; there 

 are two long lateral bristles towards the ventral margin. Internal 

 proximal portion of eighth sternite (fig. 33) produced upwards into a lobe 

 which is much longer than in garei; the apical bristles are very stout, 

 the longest being about half the length of the finger ; the membraneous 

 apical flap triangular, its proximal edge being convex and its distal 

 edge incurved. Process of clasper twice as long as it is broad in the 

 centre. Finger three times as long as it is broad, widest at three- 

 fourths, in apical half five marginal bristles, first and fourth small, 

 fifth the longest, a little longer than second and a trifle longer than 

 the finger is broad at its widest point ; end-piece of paramere (Par) 

 long, slender and strongly curved. 



