caprimi:lgid.e — the goatsuckkks. 



399 



The CaprimuJfjiacc have been divided hy Dr. Sclater as follows : — 



A. OlabriroBtrea. Kictus smooth. 



I. Tarsus stout, longer than niiddlf toe, entirely naked . . . Podager. 



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

 feathers. 



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



b. Tail elongated, a little forked Chordeiles. 



B* Setirostres. Kictus bristled. 



III. AeriaL Tarsi short, more or less clothed. 



a. Wings normal, second and third (luills longest. 



1. Tail moderate, rounded at tip 



2. Tail elongated, even at tip 



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

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



IV. TerrestriaL Tarsi elongated, naked. 



a. Bill moderately broad ; nasal aperture scarcely prominent 



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



Antrostoinufi. 



iSteuo^sis. 



Hydropsalis. 



Heleoihreptus. 



Xyctidromus. 

 tSiphonorhis. 



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 Xydidromm should be included, as among the manu- 



Chordeilfx popetue. 



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

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

 cdhicollis} 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. 



^ NycHdromus alhicoUit. Cnprimulgus alhicoUis and guianemtis, Omelin, S. N. T, 1788, 

 1030. Nydidromus amcricanus, Cassix, Pr. A. N. S. 18.51, 179. Xyctidromus guin nensis, 

 dcrhyaniis, grallarius, — nffinUi of authors. Xydidromiis ulbicollis, ScLATER, P. Z. S. 1866, 

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



