51) BULLETIN 5 0, UNITED STATES NATIONAL MUSEUM 



jj. Abdomen narrowly whitish in midventral part; ilaak 

 color extensive. 



Ballus longirostris rhizophorae (p. 79) 

 Ml. Sides of neck, lower throat, and breast with a grayish wash. 

 i. Dark medial portions of feathers of upi)erparts very 

 dark — dark fuscous to fuscous-black. 

 j. Margins of dorsal feathers pale olive-gray. 



Ballus longirostris belizensis (p. 72) 

 /;. Margins of dorsal feathers olive or brownish. 

 k. Planks dark hair brown. 



Ballus longirostris saturatus (p. 60) 

 7rfc. Flanks darker and less grayish — dark sepia. 



I. Lower throat and breast paler — light pinkish cinna- 



mon heavily washed with grayish. 



Ballus longirostris vafer, dark phase (p. 67) 



II. Lower throat and breast darker— light ochraceous- 



salmon heavily washed with grayish. 



Ballus longirostris scottii (p. 57) 

 ii. Dark medial portions of feathers of upperparts paler — 

 buffy brown to sepia. 

 ;. Medial portions of feathers of upperparts of body very 

 pale — buffy brown to r.ither light olive-brown, 

 fc. Breast pale ocl>raeeous-bufC or light pinkish cinnamon 

 Ballus longirostris vafer, pale phase (p. 67) 

 7rfc. Breast grayish or only lightly washed with ochraceous- 

 buff. 

 /. Flanks dark, dark hair brown. 

 m. Bill shorter, 53 mm. 



Ballus longirostris pallidus (p. 71) 

 mm. Bill longer, over 53 mm. 



Ballus longirostris waynei, light phase (p. 55) 

 11. Flanks paler, dusky drab. 



Ballus longirostris crepitans (p. 51) 

 jj. Medial portions of feathers of upperparts of body 

 darker — dark olive-brown to sepia, 

 fe. Sides of neck decidedly more brownish than grayish. 



I. Larger ; wings, $ , averaging 155 mm., female 138 mm. 



Ballus longirostris vafer, intermediate phase (p. 67) 



II. Smaller ; wing, $ , averaging 145 mm., female 137 mm. 



Ballus longirostris limnetis (p. 68) 

 kk. Sides of neck decidedly more grayi-h than brownish. 

 I. Sides of head below and behind eye paler — light 

 neutral gray. 

 m. Gray margins of feathers of upperparts very dis- 

 tinct from dark medial areas. 



Ballus longirostris insularum (p. 59) 



mm. Grayish margins of feathers of upperpart washed 



with brownish and not very distinct from dark 



medial areas. 



n. Color of lower throat and breast more grayish 



than buff. 

 Ballus longirostris leucophaeus, dark phase (p. 66) 



