506 Annals of the Carnegie Museum. 



Family MICROPODID^E. 



Key to the Costa Rican Species. 



a. Tail very stiff, with prominent protruding spines; size small (wing about no 

 mm.). 

 b. Rump and upper tail-coverts dull brownish or grayish-sooty, never ashy. 

 c. Pileum and back deep sooty-black, with greenish reflections; rump 

 and upper tail coverts dark grayish-sooty. 



Chcetura gaumeri $ , 9 • 

 cc. Pileum and back dull sooty, with scarcely any greenish reflections; 

 rump and upper tail-coverts pale grayish sooty; inner webs of rec- 

 trices (above) decidedly paler and grayer than outer. 



Chcetura vauxi $ , 9 • 

 bb. Rump pale grayish-ash or dark cinereous. 



c. Upper tail-coverts short and darker than the rump and falling short 



of tips of rectrices by about 20 mm.; rump pale grayish-ash. 



Chcetura spinicauda fumosa $ , 9 • 



cc. Upper tail-coverts dark ashy-gray like the rump, and extending to 



within about 13 mm. of the tips of rectrices. 



Chcetura cinereiventris phceopygos $ , 9 • 



aa. Tail stiff or soft but never with prominent protruding spines. 



b. With a white collar or a white streak over the eye. 



c. Neck completely encircled by a white collar (wing 195 mm.). 



Streptoprocne zonaris zonaris $ , 9 - 



cc. A white streak over and behind eye; lores black (wing 150 mm.) 



Cypseloidts cherriei $, 

 bb. No white on head or neck. 



c. Size larger (wing 155 to 165 mm.). 



d. Feathers of abdomen and under tail-coverts edged with white. 



Cypseloides niger borealis juv. $ , 9 • 



dd. No white edgings on lower parts, sooty-black throughout, throat 



slightly grayer. Cypseloides niger borealis $ , 9 • 



cc. Size smaller (wing 120 to 130 mm.). 



d. Broad band of dark chestnut-brown encircling neck, broader 



in front. Cypseloides brunneitorques $. 



dd. Without chestnut collar, sooty-black throughout, paler below. 



Cypseloides brunneitorques 9 • 



218. Streptoprocne zonaris zonaris (Shaw). 



Hirundo zonaris Shaw in Mill. Cim. Phys., 1796, 100, pi. 55. 



Hemiprocne zonaris Boucard, P. Z. S., 1878, 67 (" Seen on Irazii "). — 



Zeledon, An. Mus. Nac. de C. R., I, 1887, 120 (La Palma de San Jose). 

 Chcetura zonaris Hartert, Cat. Birds Brit. Mus., XVI, 1892, 476 (no C. R. 



record). — Salvin and Godman, Biol. Centr.-Am., Aves, II, 1893, 373 (C. R. 



[Van Patten in U. S. Nat. Mus.]). 

 Streptoprocne zonaris zonaris Oberholser, Proc. Biol. Soc. Wash., XIX, 1906, 



67-70 (critical). — Bangs, Auk, XXIV, 1907, 295 (Boruca, six specimens 



[Underwood]). 



