344 ZOOLOGICAL RESULTS OF THE EUWBNZOEI EXPEDITION". 



extraordinary clicking sound would commence (such a sound as is made by quickly 

 bending and letting fly the tip of a strong quill tooth-pick), followed by a succession 

 of quick high-pitched piping notes. A search for the performer usually resulted 

 in finding nothing, so cunning were these birds in sneaking away through the 

 undergrowth without being seen, and it was some time before we discovered the 

 author of these strange noises. — i?. B. W.'] 



Detoscopus leucoehynchus Hartl. 



Laniarius leucorhynchus Reich. Vog. Afr. ii. p. 573 (1903) ; Sharpe, Ibis, 1908, p. 331 

 [Cameroon] . 



a. 3 . Fort Beni, Semliki Valley, 3000 ft., 18th July. [No. 3502. B. B. W.] 



Iris dark brown ; bill and feet black. 



The members of the Expedition did not recognize the differences between this species 

 and I), hohmelas, which was met with on the west as well as on the east side of 

 Euwenzori, and consequently they did not trouble to procure a series of specimens. 

 Dr. Eeichenow states that the white bill in this species is a characteristic of the very 

 old bird ; but this is clearly an error, as all the specimens in the British Museum with 

 a white bill are obviously quite young, and in one from Efulen, Cameroon {Bates Coll.), 

 the tail is only partially grown. 



Lanius inteecedens Neumann. 



Lanius excubitorius intercedens Neumann^ J. f. O. 1905, p. 228 [Hawash Valley to Victoria 



Nyanza] . 

 Lanius intercedens Grant, Ibis, 1907, pp. 590, 591. 

 a-f. c? ? et 2 imm. Mokia, S.E. Ruwenzori, 3400 ft., 25th-30th April. [Nos. 



d. d. 



1466, 1467. B. C. ■ 2285, 2289, 2290, 2307. G. i.] 



g-q. c? S et d imm. Mokia, S.E. Ruwenzori, 3400 ft., 3rd-19th May. [Nos. 271, 



279, 288, 294, 298, 322, 347, 349. R. E. B. ; 1485, 1517. B. C] ^ 



r-t. S ? . Mokia, S.E. Euwenzori, 3400 ft., 4th-24th June. [Nos. 457. R. E. B. ; 

 1680. B. a ; 3455. R. B. W.] 



Adult male and female. Iris dark brown ; bill and feet black. 



[Neumann's Long-tailed Grey-backed Shrike was very numerous all through the 

 acacia-country around the south end of Euwenzori and in the upper part of the Semliki 

 Valley. It was a conspicuous object, even from a distance, perched on the topmost 

 bough of an acacia-tree, or flying, as they do, in a perfectly straight line from one tree 

 to another. Its low note has a curiously musical sound, like several notes in harmony. 

 —R. B. W.] 



