CAPRIMULaiD^ — THE GOATSUCKERS. 



399 



The Caprimulgince have been divided by Dr. Sclater as follows : — 



A. Glabrirostres. Rictus smooth. 



I. Tarsus stout, longer than middle toe, entirely naked 



II. Tarsus modei-ate, shorter than middle toe, more or less clothed 

 feathers. 



a. Tail short, almost square ........ 



I. Tail elongated, a little forked 



B. Setirostres. Rictus bristled. 



III. Aerial. Tarsi short, more or less clothed. 



a. Wings normal, second and third quills longest. 



1. Tail moderate, rounded at tip 



2. Tail elongated, even at tip 



3. Tail very long, forked or bifurcate .... 

 h. Wings abnormal in male ; outer six quills nearly equal 



IV. Terrestrial. Tarsi elongated, naked. 



a. Bill moderately broad ; nasal aperture scarcely prominent 

 h. Bill very broad ; nasal aperture much projecting (Jamaica) . 



Podager. 



with 



Lurocalis. 

 Chordeiles. 



Antrostomus. 



Stenopsis. 



Hydropsalis. 



Heleothr'eptus, 



Nyctidromus. 

 Siphonorliis. 



Of the genera enumerated above, only two certainly belong to the fauna 

 of the United States {Chordeiles and Antrostomus), although there is some 

 reason to suppose that Nyctidromus should be included, as among the manu- 



Chordeiles popetue. 



script drawings of Dr. Berlandier, of birds collected at Matamoras on the 

 Lower Eio Grande, is one that can be readily referred to no other than N. 

 alhicollis} The briefest diagnoses of these three genera will be as follows : — 



Chordeiles. Gape without bristles; tarsi moderate, partly feathered; tail narrow, 

 slightly forked ; plumage rather compact. 



1 Nyctidromus albicoUis. Caprimidgus albicollis and guianoisis, Gmelin, S. N. I, 1788, 



1030. Nyctidromus americanus, Cassin, Pr. A. IT. S. 1851, 179. Nyctidromus guianensis, 



dcrbyanus, grallarius, — affinis of authors. Nyctidromus albicollis, Sclater, P. Z. S. 1866, 

 145. Hab. Froiu Northern Mexico southward to Ecuador and Brazil. 



