PRIONOPS CRISTATA 485 
Martens’s Helmet-Shrike inhabits eastern Camaroon. The 
species is as yet known only by the typical specimens collected 
by Carnap. Possibly, as Dr. Reichenow suggests, the speci- 
men of P. plumata, Hartl., W. Afr. p. 107 (1857) from 
Gaboon may belong to this species. It is an intermediate 
race between P. plumata and P. concinnata, with a strong 
inclination towards the latter species. 
Prionops cristata. 
Prionops (Lanius) cristatus, Riipp. N. Wirb. Vog. p. 30, pl. 12, fig. 2 
(1835) Massaua. 
Prionops cristatus, Shelley, B. Afr. i. No. 665 (1896)}; Reichen. Vég. 
Afr. ii. p. 530 (1903); Sharpe, Handl. B. iv. p. 273 (1903); Ogilvie- 
Grant, Ibis, 1904, p. 267 Biya; Bannermann, Ibis, 1910, p. 304 
Burao. 
Prionops cristata cristata, Neum. J. f.O. 1905, p.215 Zwai lake ; Zedlitz, 
J. f. O. 1916, p. 795 Hritrea. 
Subspecies a. Prionops omoensis. 
Prionops cristatus omoensis, Neumann, J. f. O. 1905, p. 216 Omo Fiver. 
Subspecies b. Prionops melanoptera. 
Prionops melanoptera, Sharpe, Bull. B.O.C. xi. p. 46 (1901) Fer Libah, 
Somaliland ; Reichen. Vog. Afr. ii. p. 530 (1903); Sharpe, Hand. 
B. iv. p. 274 (1903): Neum. J. f. O. 1905, p. 219; Erlanger, ¢é.c., 
p. 699, pl. 16, fig. 1. 
Subspecies c. Prionops intermedia. 
Prionops intermedius, Sharpe, Bull. B.O.C. xi. p. 47 (1901) Tecta ; id. 
Handl. B. iv. p. 274 (1903) ; Neum. J. f. O. 1905, p. 219. 
Prionops melanoptera intermedia, Reichen. Vog. Afr. ii. p. 530 (1903). 
Adult. Very similar to P. concinnata, especially in the form of the crest 
and the colouring of the head, but differing from it and all the previous 
species in having no white on“the wing-coverts, while the secondaries are 
generally without any white edging, or occasionally have a very narrow band 
towards the tip of the feathers. Length 9:0 inches, wing 4:4, tail 3-7, culmen 
0-4, tarsus 0°9. Abyssinia (Verreaux). . 
Subspecies P. c. omoensis. Differs from the typical form in having the 
occipital region much darker, usually dark slate blue instead of pearl grey ; 
the throat also is washed with smoky instead of being pure white, and the 
patch across the ear-coverts is almost black. Iris and eyelid yellow, bill 
August, 1912. 32 
