Canadian mutomalcubt. 



Vol. XXXVIII. LONDON, OCTOBER, 1906. 



No. 



10 



THREE NEW CANADIAN FLEAS. 



BY THE HON. N. CHARLES ROTHSCHILD, M.A., F.L.S., TRING, HERTS, ENG. 



I. Chceiopsylla setostis, sp. nov. — Nearest to Ch. ursi, Rothsch. (1 902), 

 but easily recognized by the shape of the abdominal sclerites and the tarsi. 



Head. — The labial i)alpus consists of about ten segments, reaching 

 beyond the trochanter, while in ursi there are seven or eight segments 

 only. There is one row of four or five bristles before the eye. The 

 occiput bears two or three hairs behind the base of the antenna, a lateral 

 row of four or five bristles in the centre, and a subapical row. 



Thorax. — There is one row of bristles on the pronotum, besides one 

 or two hairs situated on the back. The ep'merum of the metathorax is 

 strongly produced backwards, rather more so than in Ch. trichosa^ Koh. 

 (1903), and bears a posterior row of from six to nine bristles, besides about 

 ten smaller ones, which are arranged m two irregular rows. 



Abdomen. — The tergites of the first seven segments bear each two 

 rows of bristles, there being some additional hairs in front of these rows 

 ori the first three tergites. The anterior row is incomplete on the 

 posterior tergites. On the second tergite there are about eight, on the 

 third about six bristles placed beneath the stigma, while there are in this 

 position two bristles on segments four to seven, the last bristle of the 

 postmedian row being likewise situated below the stigma (Fig. 41). 



Fig. 41. 



Fig. 42. 



The first sternite has some lateral bristles, while the sternites of segments 

 three to seven bear each a row of three or four bristles, and from 



