ao [March, 



centre of the sides. Hindfemur witli one or two lateral bristles on 

 the inner surface. Apical area of nietanotuni not i-educed (tig-. 27). 



(^ . Eighth tergite without an internal ai-ea of sharp points, only 

 a few such raised points being present at and close to margin ; on outer 

 surface about six bristles at and near margin, and a few on the sides. 

 Eighth sternite (tig. 26 j wdth broad and short membranaceous apical lobe, 

 which is denticulated at the distal edge ; upper margin of sternite almost 

 straight, ventral margin convex, apex on the two sides together with 6 

 to 8 nearly straight bristles, of which the longest is about two-thirds 

 the length of the tinger ; the proximal, internal, portion of the eighth 

 sternite is boot- shaped with the toes turned upwards and sliglitly 

 distad. Finger similar to that of galMnae, shorter, three times as long 

 as broad, proximal margin augulate in centre, at apex evenly rounded 

 on the posterior side, with two bristles near apex, of which the upper 

 one is slightly the longer, being rather more than half as long again 

 as the finger is broad at its widest point ; in between these bristles a 

 short one, and further down a slender bristle which is smaller than the 

 lower apical one. 



?. Seventh sternite rotundate-truncate (fig. 28). Eighth tergite 

 with two long and some smt»,ll bristles below the stigma and ten or less 

 bristles on the ventral area. Stylet at the most twice as long as broad. 

 Head of receptaculuni seminis nearly one-third longer than the tail, 

 but twice as broad, the upper margin of the head slightly incurved or 

 nearly straight, and the ventral margin evenly convex. 



Very common all over England and Scotland in the nests of birds. 

 Amon"' the many hosts may be mentioned the lark (Alaiida arvensis), 

 the bearded tit {Panurus biarmicus), and several gulls (Larus). Also 

 found in Ireland. 



15. Ceratophyllus columbae Gervais (1844). 

 (Figs. 29, 30). 



Two rows of bristles in front ef eye ; on occiput one bristle above 

 centre of antennal groove, but no bristles behind base of the groove 

 (apart from minute hairs). Spines of pronotal comb much shorter 

 than the pronotum measured in the centre of the sides. Hindfemur 

 on inner surface with a lateral row of four to seven bristles. 



(^ . The rough marginal area of the inner side of the eighth 

 tero-ite studded with hair-lihe points is narrow ; the segment bears on 



