278 The Wilson Bulletin — No. 90 



some of the Rallidce, Scolapacidce {Bartramia longicanda Up- 

 land Plover, Actitis macularia Spotted Sandpipar), Charadri- 

 idce, GallincE (genera Bonasa, Centrooercus and Meleagris), 

 the g-enus Otus, TrochilidcB (at least A. coluhris and ^9. 

 riifiis), Tyrannidcc (perhaps not including E. wrigkti and 

 P. ruhiniis me.ricaniis), CorvidcB (except Corvince), Doli- 

 chonyx oryzivorus Bobolink, Agelaius plioeniceus Red-wingedi 

 Blackbird, subgenus Icterus, Hesperiphona vespertina ves- 

 pertinu Evening G-rosbeak, Carpodacus purpiireus purpureus 

 Purple Finch, AstragaUnus tristis tristis Goldfinch, A. t. sali- 

 camans Willow Goldfinch, Plectrophenax nivalis nivalis Snow 

 Bunting, Fasserina cyanea Indigo Bunting, P. ciris Painted 

 Bunting, Pirar.ga erythromelas Scarlet Tanager, genus Lan- 

 ius, MniotiltidcE (with some exceptions), Mimus polyglottos 

 Mockingbird, Dumetelea caroliiiensis Catbird, Thryothorus 

 hidovicianus niiamensis Florida Wren, Certhia familiaris 

 americana Brown Creeper, PentJtcstes airicapillus atricapillus 

 Chickadee, and the Turdince. 



Incubation receives the attention of the male only, in the 

 Phalaropodidce, and some of the Scolopacidcc (Eurynorhyn- 

 chus pygmens Spoon-billed Sandpiper). 



The Passerine genera Molofhnis and Tangcn'iiis are para- 

 sitic and of course do not incubate at all. 



The period of deposition of a species seems to depend most- 

 ly upon the general productiveness of the group to which it 

 is most nearly related ; and to a lesser extent, upon the rela- 

 tive size of the species and its egg to that of the group, the 

 maximum sometimes requires a longer period to recuperate. 



A species belonging to a group capable of and most com- 

 monly producing the maximum number of eggs in a set or 

 in a season, ordinarily deposit an egg daily. This includes 

 the Colymhi, Anatidce, Rallida, Scolapacidce, Pici, Cucnllidce 

 and Parser es (there are instances of the deposition of two 

 eggs in one day by the prolific Colaptes auratns Intens North- 

 ern Flicker, Sayoniis phoehe Phoebe, Passer domcsticus Euro- 

 pean House Spa-rrow, and Spicella passcrina pas^criiia Chip- 

 ping Sparrow.) 



