1874.] THE GENUS SAXICOLA. 217 



1 7. opistholeuca, Strickl. Similar to S. leucura, but smaller. 

 Culm. 0*6, tarsus - 9. 



Section II. Back in the males black ; shoulders white. 



24. monticola, Vieill. Entirely black, except abdomen and 



shoulders. 



25. arnotti, Tristr. Supercilium white ; crown white and black 



intermixed ; entire underparts black. 



26. leucomelcena, Burch. Crown grey ; rump, upper and under 



tail-coverts, base of rectrices, and abdomen white. 



27. griseiceps, sp. nov. Head and nape ashy grey ; otherwise 



not unlike the preceding species. 



Section III. Back in the males cinereous. 



1. cenanthe, L. A black mark through the eye ; underparts 



whitish ; wings black ; sexes dissimilar. 



29. cinerea, Vieill. No black mark through the eye ; throat 



and breast pale cinereous ; rump and outer edges of all 

 tail-feathers, except central pair, white ; second primary 

 emarginate at tip. 



30. pollux, Hartl. No black mark through the eye ; throat and 



breast cinereous; rump similarly coloured to the back; 

 external edges of outer rectrices white ; second primary 

 emarginate at tip. 



31. castor, Hartl. No black mark through the eye; underparts 



cinereous throughout ; rump and basal portion of all tail- 

 feathers, except the two central pairs, white ; second 

 primary not emarginate at tip. 



28. diluta, sp. nov. No black mark through the eye ; upper 



parts to the rump pale cinereous ; rump and basal portion 

 of all tail-feathers except central pair white ; shoulders 

 white or whitish ; second primary not emarginate. 



Section IV. Sack in the males neither black nor cinereous. 



A. Interscapulary region in adult white in breeding-plumage, ru- 



fescent or greyish in winter ; wings blackish ; sexes dissimilar. 



a. Underparts white in breeding- plumage. 



2. stapazina, L. Black band through the eye ; throat white. 



b. Throat black. 



4. rufa, Brehm. Black on the throat not extending far down 



the throat ; upper parts white in summer, rufescent in 

 winter. 



5. melanoleuca, Giild. Black on the throat extending very far 



down, to the top of the breast ; upper parts white in summer, 

 rufescent in winter. 



6. erythraea, Ehr. Black extending to the upper breast, and 



joining that colour on the flanks ; upper parts white in 

 summer, greyish in winter. 



B. Feathers on the interscapulary region intermixed black and 



rufescent ; wings black. 



Pnoc. Zool. Soc— 1874, No. XV. 15 



