61 [March, 



very numerous and those placed at tlie edge mostly thin ; eighth 

 sternite long, rod-like, evenly curved, witli a brush of long bristles 

 ventrally at the apex, the proximal (internal) portion strongly rounded 

 dorsally (fig. 15) . Process P of the clasper broad and short. Finger (F) 

 widest in the centre ; its hindmargin evenly curved and bearing five 

 or six bristles. 



? . Seventh sternite with broad ventral lobe (fig. 16). Bristles 

 below the stigma of eighth tergite very numerous, as are those on the 

 ventral portion of this tergite and on the sixth and seventh sternites. 

 Stylet three times as long as broad. Head of receptaculum seminis 

 sausage-shaped, three times as long as broad, nearly twice as long and 

 a little more than half as broad again as the tail. 



Very common in the nests of the sand martin (Cotile riparia); 

 occasionally found in numbers in the nest of the dipper (Ginclus 

 aqnaticus). Not recorded from Ireland. 



10. Ceratophyllus rothschildi Waterst. (1910). 



(Figs. 17, 18). 



Two rows of bi'istles before eye ; one or two medium bristles on 

 occiput ; frontal tubercle very prominent. Pronotal comb in ^ as 

 long as pronotum, in $ somewhat shorter. Apical portion of meta- 

 notum nearly as much reduced as in the other fleas from martins, 

 but bearing on each side three strongly chitinised apical spines ; 

 the distance of these spines from the row of long bristles equals the 

 length of the spines. Sensory plate small, in ^J very little longer than 

 the first hindtarsal segment is broad at the a.pex, in $ half as long as 

 the distance from the plate to the base of the stylet. Longest apical 

 bristle of second hindtarsal segment reaching somewhat beyond the 

 apex of the third segment. 



$ . Eighth tergite with 9 or 10 long bristles at or near the 

 margin, but on inner side without a rough area with hair-like points. 

 Eighth sternite long, slightly curved, with some long apical bristles ; 

 widened proximal portion produced upwards as a triangular lobe, which 

 leans towards the distal side. Process of clasper (fig. 17) club-shaped, 

 with the apex produced into a beak-like projection on the posterior 

 side. Finger triangular, widest at the apex, the apical margin being 

 longer than the anterior one, the apical distal angle with two stout, 

 black, obtuse spines. The ventral (horizontal) arm of ninth sternite 



