346 CALIFORNIA ACADEMY OF SCIENCES. 



PLATE III. 



Feathers of the wing of Falco sparverhis, showing transition of pattern 

 according to successional taxology. Natural size. 



PLATE IV. 



Heads of various North American birds, showing types of black mark- 

 ings, with their combinations and modifications. 



Fig. 1. Polioptila plumbea; a, Leucosiicte griseonucha; b, Melospha 

 geonjiana; c, Peirochelidon lunifrons; d, Coccolhraustes vespertinus. 



Fig. 2. Zonotrichia coronaia; a, Cyanocephalus cyanocephalus; b, Spi- 

 zelld socialis; c, Ceophl(eiis pileaius S ; d, Cyanociita cristaia. 



Fig. 3. Saxicola oencmihe; a, Geolhlypis trichas; b, Dendroicadominica; 

 c, Dendroica ca^anea; d, Dendroica pensylvanica; e, Hesperocichla ncevia. 



Fig. i, Colaptes auratus; a, Passerina cyanea; b, Icteria virens; 

 c, Ceophlceus pileaius $ ; d, Sphyrapicus varius. 



Fig. 5. Dendroica virens; a, Helminthophilabachmani; h, Xanthocephalus 

 xcmthocephalas; c, Guiraca ccerulea; d, C'ardinalis virginianus; e, C'ardinalis 

 cardinalis ignetis. 



Fig. U. Dendroica iigrina; a, Zonotrichia leucophrys; b, Zonotrichia 

 leticophrys intermedia; c, C'ampephilus principalis S ; d, Dendroica ccerules- 

 cens. 



Fig. 7. Dendroica blackhurnice; a, ffiite canadensis; b, Dryohates pubes- 

 cens; c, F?>eo atricapillus; d, Dendroica maculosa; e, Spinus psaltria 

 mexicana. 



Pig. 8. Dendroica striata; a, Dryobaies borealis; b, Dendroica chryso- 

 paria; c, OaTnpephilus principalis^ ; d, Calcarius lapponicus. 



Fig. 9. Parus atricapillus; a, Spinus laiorencei; b, Motacilla alba; 

 c, Sylvania mitrata; d, Calcarius ornatus; e, Calcarius pictus. 



Fig. 10. Ampelis garrulus; a, Parus gambeli; b, Melanerpes formici- 

 vorux bairdi^ ; c, Melanerpes formicivorus bairdiS ; d, Xanthoura luxuosa; 

 e, Otocoris alpesiris. 



Fig. 11. Helminthophila cArysoptera; a,, Mniotiltavaria; h, Picusvillosus; 

 c, (.'olinus virginianus texanus; d, Callipepla californica; e, Cyrtonyx monte- 

 znmce. 



PLATE V. 



Examples of yellow and red as correlative colors. [ The names Icterus 

 cucullatus and /. cucullcUus nelsoni should be transposed.] 



PLATE VI. 



The upper figure shows the effect of environment in bleaching color in 

 the genus Myiarchus. 



The lower figure shows a tail of an immature male Icterus cucullatus 

 nelsoni changing from yellow to black by the accession of pigment without 

 moult. Natural size. 



