Hidgway — New Species of Birds from Tropical America. 91 



Decidedly larger and paler than N. a. albieollis, the tawny phase 

 averaging lighter and brighter in color, with buff margins to scapulars 

 broader; gray phase similar in coloration to A T . a. merrilli 1 n it much 

 smaller. 



Measurements of type. — Wing, l(>2; tail, 155; exposed culmen, 12; 

 tarsus, 2.V. middle toe, 20.5. 



Nyctidromus albieollis sumichrasti subsp. nov. 



Type from Teapa, Tabasco, southeastern Mexico. No. 1 <»«>,*>*><> , coll. 



('. S. Nat. Mns. (Biol. Surv. coll.). Adult male March 10, 1900. 

 Collected by Nelson and Goldman. 



Similar in coloration to N. a. albieollis, but much larger; similar in 

 size tu A 7 , a. nelsoni and .V. a. yucatanensis, but much darker. 



Measurements of type. — Wing, L72.5; tail, 169.5; exposed culmen, 13; 

 tarsus, 25; middle toe, 20.5. 



The recognizable forms of this species occurring from Panama north- 

 ward arc as follows: 



1. Nyctidromus <i!l>ir<illis albieollis (Gmelin). — Panama tu State of 

 Chiapas, southern Mexico. 



2. Nyctidromus albieollis yucatanensis Nelson. — Yucatan, Campeche, 

 and extreme eastern Tabasco; British Honduras (in fall and winter). 



:',. Nyetidromus albieollis sumichrasti Ridgway. — Tabasco to Vera Cruz, 

 eastern Mexico. 



4. Nyctidromus albieollis nelsoni Ridgway. — Southwestern Mexico, from 

 < taxaca to Sinaloa. 



5. Nyctidromus albieollis insularis Nelson. — Tres Marias Islands. 



6. Nyctidromus albieollis merrilli Sennett. — Northeastern Mexico, in 

 State of Tamaulinas and southern Texas; in winter south to Mirador, 

 Vera Cruz and Metlaltoyuca, Puebla. 



Nyctibius griseus costaricensis subsp. nov. 



Type from Sarchf, Alajuela, Costa Rica. No. 85,550, coll. I'. S. Nat. 

 Mns. Adult female. August <i, 1881; Jose C. Zeledon, collector. 



Agreeing in size with .V. g. jamaicensis, hut coloration darker; de- 

 cidedly smaller and darker than .Y. g. mexiennus; averaging decidedly 

 larger than A", g. pnnamensis and coloration lighter. 



Measurements of type. — Wing, 290; tail, _ui'; exposed culmen, 20; 

 tarsus, 1 1 .5 ; middle toe, 19.5. 



Nyctibius griseus panamensis subsp. nov. 



Type from Nata, Code, Panama. No. 154,252, coll. V. S. Nat. Mus. 

 Adult male. .Jan. 24, 1889. Collected by Heyde and Lux. 



similar in coloration to N. g. griseus, but decidedly larger; averaging 

 decidedly -mailer than N. g. costaricensis and coloration darker. 



Measurements of type. — Wing, 270 ; tail. 198; exposed culmen, 20; 

 tarsus, 12 ; middle toe, 20. 



