CAI'KIMULGID.E — THE GOATSUCKERS. 399 



Tlie Caprimidfjincc have been divided l)y Dr. Sclater as follows: — 



A. OlabriroBtrea. Rictus smooth. 



I. Tarsus stout, longur tlian iniilillo too, entirely naked . . . Podmjer. 



II. Tarsus moderate, shorter than middle toe, more or less clothed with 

 feathers. 



a. Tail short, almost square Lurocalis. 



h. Tail elongated, a little forked Chordeiles. 



B. SetiroBtres. Rictus bristled. 



III. AeriaL Tarsi short, more or less clothed. 



o. Wings normal, second and third quills longest. 



1. Tail moderate, rounded at tip Antrostomus. 



2. Tail elongated, even at tip iSleiwjjsis. 



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

 h. Wings abnormal in mah; ; outer six quills nearly equal . Heleothreptus. 



IV. Terrestrial. Tarsi elongated, naked. 



o. Bill moderately broad ; nasal aperture scarcely prominent . Nyctidromus. 

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



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- 



Chordeilfs popetuf!. 



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

 Lower Rio Grande, is one that can he readily referred to no other than JV. 

 cdbicollis} The briefest diagnoses of tliese three genera will be as follows : — 



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

 slightly forked ; plumage rather comjiact. 



1 NycUdmmm albimUis. Cnprimulqus nlhicnllis and r/iiiannixis, Omklik, S. N. T, 1788, 



1030. Ni/clidromtis americaiuis, CA.ssrx, Pr. A. N. S. 1851, 179. Xnc/iUromus r,iii<ninisi«, 



derbijamis, tjrnlliirius, — nffinis of nutliors. Xiiftiilnniiiis iilhicollis, ScLATEIl, P. Z. S. 1SG6, 

 145. Hab. From Northern Mexico .southward to Kouador ami 15razil. 



