JVelson — North American Mainldiul Myuirchus. 27 



The autliors of the Bioiogia however, in plaee oJ' using Baird's 

 name c()oj)iri unite the ))ii(ls of eastern and western Mexico 

 under Kidgway's mai/ister, which is a distinct subspecies from 

 cooperi and siiould not be confused with either of Kaup's 

 l)irds. 



Tiie color terms in this paper are based on Mr. Kidgway's 

 'Nomenchiture,' and all measurements are given in millimeters. 



1 have again to thank Mr. Robert Kidgway and Dr. Chas. 

 W. Richmond, of the National Museum, for their continued 

 courtesies. 



KEY TO SPECIES AND SUBSPECIES. 



Bill rounded, with depth at angle of gonys nearly or quite equal to 

 width at same place (subgenus Myuirclmts) 

 Wing and tail feathers without rufous or cinnainon area on either web; 

 crown olive brown; back greenish olive - jxinameuffis p. 29. 

 AVing and tail feathers with distinct rufous or cinnamon area on one 

 or both webs 

 Inner web of outer tail feather visually entirely rufous (except in 

 some specimens a narrow dusky line along shaft mainly near 

 tip) 

 Bill small and proportionately slender (exposed culmen usually 

 less than 19 mm.) 

 Size small, wing usually less than S6 mm. - nuttingi p. 37. 

 Size larger, wing usually more than than 93 mm. ( 9 's in part) 



cinerascens p. 33. 

 Bill stout and proportionally heavy (exposed culmen usually more 

 than 19 mm.) . 



Underside of neck and breast pale ashy gray bruchyurus p. 40. 

 Underside of neck and breast dark gray 



Exposed culmen not over 20 mm. - - crinitus p. 29. 



Exposed culmen over 20 mm. - - residuui< p. 30. 



Inner web of outer tail feather partly- or wholly dusky- 

 Inner web of outer tail feather wholly dusky yucatanensis p. 41, 

 Inner web of outer tall feather partly' dusky 

 Inner web of outer tail feather with well defined dusky band 

 along shaft, rufous along inner border to tip 

 Bill long and heavy (usually 20 mm. or over); dusky band on 

 inner web of outer tail feather usually broadest in mid- 

 dle. 

 Size smaller, wing usually less than 105 mm. mexicanujs p. 31. 

 Size larger, wing usually more than 105 mm. magister p. 33. 

 Bill small and slender, exposed culmen usually less than 18 

 mm.: dusky band on inner web of outer tail feather 

 broadeiiing gradually from base, widest at tip 



