NOVITATES ZOOLOGICAE XXI, 1914. 223 



lateral bristles on the inner surface of this segment. The anal sternite (X. st.) is 

 angnlate ventrally in a lateral aspect, and bears at and near this angle a bunch of 

 bristles. The stylet is three times as long as it is wide. The head of the receptacnlum 

 seminis is about as long as the tail, but more than twice as wide. 



South Georgia, on Prion banhsi and Larus dominicus. 



Mr. Murphy frequently saw this species of flea in the feathers of freshly 

 killed Prion, and also observed them jumping about in the nest burrows of 

 these birds. 



ON A NEW FORM OF RHEA. 



By the Hon. WALTER ROTHSCHILD, F.R.S., and CHARLES CHUBB, M.B.O.TT. 



Rhea americana intermedia subsp. n. 



^if/«^^.— General colour of the upper surface pale ash grey ; short humeral 

 feathers pale ash grey, the longer ones, on the outer side, grey with white bases, 

 while those on the inner side, nearest the body, have a bluish tinge and black 

 bases ; the feathers round the bend of the wing are composed of grey, brown, and 

 white ; wing-coverts grey with white bases ; outer primary quills dark brown with 

 white bases, and edged with white at the tips, the median quills ash grey, the 

 innermost quills also grey, becoming dark brown towards the base ; interscapulary 

 region grey ; the small narrow feathers on the back are dark brown with pale 

 margins, the dark colour becoming gradually paler on the lower back and merging 

 into the creamy white on the sides of the rump; crown of head sooty grey, with 

 black shaft-streaks and black hair-like tips ; snperciliaries, sides of face, and neck all 

 round creamy white with black shalt-lines which also have the hair-like tips, the 

 black much more intensified on the nape where it forms a patch ; chin and upper 

 throat uniform dull white ; the feathers on the lower neck are larger, the dark 

 pattern gradually increasing in extent, and become uniform black on the basal 

 portion of the neck and sides of the upper breast ; middle of upper breast also black 

 with some pearl-grey feathers intermixed ; sides of the body, thighs, and remainder 

 of the upper surface buffy white. Exposed portion of culmen 87 mm., length of 

 neck 380, tarsus 307, middle-toe and claw 129. 



H'xb. — Barra San Juan, Colonia Uruguay. Type in collection of Dae d'Orleaus. 



COMPARATIVE KEY. 



a. Interscapulary region dark brown ; neck dull white ; tarsus 305 mm. ; middle- 



toe and claw 117 mm. . . . R. americana americana, North Brazil. 



b. Interscapulary region ash grey ; neck buffy white ; tarsus 307 mm. ; middle-toe 



and claw 120 mm. . . Li. americana intermedia, South Brazil, Uruguay. 



c. Interscapulary region black; neck for the most part black; tarsus 337 mm. ; 



middle-toe and claw 150 mm. . . R. americana rothschildi, Argentina. 



15 



