590 Capt. G. E. Shelley on 



Key to the Ethiopian Forms of Dicrums. 

 «. Tail more forked ; depth of fork 1-25 to 2-.5 inches. 

 a}. Frontal feathers much elongated and longer than 



the culmen D. forficutus. 



b^. Frontal feathers not elongated. 



«-. Entirely black, with a green gloss. Culmen 

 1-2, wing 5'G ; tail, central feathers 5'0, 

 outer ones 7*5 ; tarsus 1-0. — Mayotte I. . . D. waldeni. 

 P. Quills and tail brown ; remainder of plumage 

 in adult males black glossed with greenish 

 blue. 

 «^ Wing 5-8, tail 5-6, tarsus 0-96. — Great 



Comoro I -D. fuscipennis. 



b^. Wing 5'3 ; tail, central feathers 4'2, outer 

 5-55; tarsus 0-92. The female differs 

 in being slaty grey above and greyish 



white below. — Aldabra I D. aldahrayiva. 



b. Tail less forked ; depth of fork less than one inch. 

 c\ Tail more forked ; wing 4-8 to 5-5, tail 4-4 to 5-3. 

 c". Back strongly glossed like the crown and 



upper tail-coverts D. afer, 



d'\ Back velvety black, contrasting strongly with 

 the glossy green of the crown and upper 

 tail-coverts, 

 c^ Larger: culmen 1-0, wing 5'2 to 5'5, tail 



4*8 to 5-0. — Prince's I D. modestus. 



d^. Culmen 0-75 to 0'85, wing 4-8 to 5-3, tail 



4"4 to 4"5. — Continent of Africa D. coraciniis, 



d^. Tail square or much less forked ; wing 3'8 to 4-6, 

 tail 3-5 to 4-2. 

 e^. Ends of tail-feathers more angular ; wing 3-8 

 to 4"1, tail 3'5 to 37. — South from the Congo 



and Tana Rivers -D. liidivigi. 



/'-. Ends of tail-feathers more rounded ; wing 4'0 



to 4"6, tail 3*5 to 4"2. — Gambia to Gaboon. D. atripennis. 

 (f. Entire plumage black, slightly glossed with 



blue ; wing 4'2, tail 4'0. — Gaboon D. sharpii, 



21. Prionops talacoma (op. cit. p. 49). 

 Angoniland. Native name " Manda." 



22. Enneoctonus collurio (op. cit. p. 53). 

 Lindipe. 



23. Laniarius mosambtcus (op. cit. p. 53). 

 Angoniland; Chicala. Native name ''ikfM;?yo." 



