iJA, [March, 



22. Cekatophyllus sciurorum Schrank (1803). 



(Figs. 42, 47. 48). 



Two median bristles on occiput, the one nearest to the anteunal 

 groove being long, the other placed obliquely above the first. Lower 

 antepygidial bristle less than half the length of central one. Hind- 

 femur with two and midfemur with one lateral subventral bristle on 

 inner surface, besides a sub-apical one. 



(^ . Eighth abdominal sternite small (fig. 47) , the proximal portion 

 boot- shaped with the toe pointing upwards, and the horizontal outer 

 portion linear. The widened portion of eighth tergite dorsally with 

 about eight long bristles. Finger very cliaractei*istic, being almost 

 linear and about five times as long as it is broad. 



9 . Seventh abdominal sternite (fig. 48) almost gradually narrowed 

 in a lateral aspect, with the apex nearly evenly rounded, without any 

 sinus. Head of receptaculum seminis elongate-elliptical, less than 

 twice as wide as, and only a little longer than, the tail. Stylet about 

 twice as long as it is broad ; both lateral bristles long. 



Common in England, Scotland, and Ireland on the squirrel 

 (Sciurus vulgaris), the dormouse (Muscardinus avellanarius) , and 

 occasionally on the pine marten (Martes martes), the stoat (Mustela 

 erminea), and the weasel (Mustela nivalis). 



23. Ceratophyllus penicilliger Grube (1852). 



(Figs. 49, 50). 



A median row usually of four bristles on occiput. Mid- and hind- 

 femora with one lateral bristle placed in the basal fourth. 



^ . First midtarsal segment with several long slender bristles, 

 the longest apical one reaching nearly to the apex of the fourth 

 segment. Eighth tergite with a narrow stripe of small hairs on inner 

 surface along dorsal edge of widened portion, and a dozen long 

 bristles on the outside. Eighth sternite narrow, slightly convex 

 ventrally, and dorsally deeply concave, at apex with two very long bristles 

 (one on each side) and two narrow fringed flaps (fig. 49;. The finger 

 is broadest in the centre, gradually narVowing from here to the apex ; 

 it bears two short obtuse spines close together at the widest point, a 

 pointed spine-like bristle half-way to apex pointing downward, and a 

 smaller one near the apex pointing upwards. The ninth sternite has 



