BIRD-INFESTING MALLOPHAGA OF JAPAN 



6 9 



on the margin of antennal fossa and the narrow occipital border of the same 

 colour. Clypeal suture pale brown, with several short and six long hairs 

 (four lateral and two submedian). 



Prothorax hexagonal, nearly as wide as the head at temporal angles ; 

 with anterior and posterior margins concave ; lateral angle distinct, with two 



spines and a long hair at apex; two spines on 

 lateral margin in front of the lateral angle ; one 

 long hair and a spine near the posterior angle. 

 Submarginal bands brownish. 



Metathorax scarcely longer than prothorax, 

 with anterior parts rounded and covered by 

 prothorax; sides very slightly concave; posterior 

 border truncate and as wide as the first segment 

 of abdomen ; four spines in the anterior part of 

 lateral margin, and two longish hairs near 

 posterior angles. Lateral bands dark drown ; 

 two indistinct transverse dark bands interrupted 

 in the median line ; Legs pale brownish with 

 transverse whitish markings. 



o 



Abdomen with weakly convex and sub- 

 parallel sides ; last segment broad and rounded; 

 a long hair and a very small spine on posterior 

 angles of each segment ; on the dorsal surface 

 just inside of the coloured lateral bands, a double 

 longitudinal row of weak hairs ; four or six long 

 and a few short hairs on the rounded margin of eighth segment. Lateral 

 bands dark brown ; posterior margin of each segment whitish. 



Male : - Smaller than female ; the last abdominal segment with a dusky, 

 median transverse band, but without lateral bands ; posterior margin truncate, 

 with a brownish marginal band; genitalia distinct, racket-like in shape, 

 reaching from sixth segment to the middle of eighth segment. 



This species much resembles Kellogg's Physostomum sucinacaim as 



Fig. I. 



Physostomum intermedium 

 n. sp , female. X30 



