THE GENUS CHORDEILES SWAINSON OBERHOLSEK, 



105 



With large series of specimens for comparison from California, 

 Arizona, New Mexico, and Texas, no geographical differences are 

 observable, and the birds from all these areas evidently belong to the 

 same subspecies. The apparently smaller size of the Texas males 

 in the measurements given below is due to the smallness of the series. 

 Birds from San Diego, southern California, are somewhat smaller 

 than typical Chordeiles acutipennis texensis, and thus incline toward 

 Chordeiles acutipennis inferior^ but they are nearer the present fonn. 

 Examples from the various geographic areas average in measure- 

 ments as follows: 



Localities. 



Middle 

 toe. 



Five males, from California. . 



Five males, from Arizona 



Five males, from Texas 



Five females, from California 

 Five females, from Arizona . . 

 Five females, from Texas 



mm, 

 14.2 

 14.3 

 14.1 



14.3 

 14.5 

 13.9 



The Juvenal and first autumn plumages of this race are apparently 

 identical in color with those of Chordeiles acutipemvis inferior. The 

 adults have about the same range of individual variation in color 

 as that race, but are apparently more variable in size. The ochra- 

 ceous phase is like that of Chordeiles acutipennis inferior^ less marked 

 than in Chordeiles acutipennis acutipennis ; but the light and dark 

 extremes are, however, just as distinct. 



The two type specimens, adult and male and female, of Chordeiles 

 acutipennis texensis are in the American Museum of Natural History. 

 They are flat skins, obtained by Capt. J. P. McCown in Texas, and 

 were originally in the collection of George N. Lawrence. The male, 

 which, of course, is to be considered the type, is an abnormally small 

 bird, as its measurements on page 109 show. It is marked in Law- 

 rence' handwriting on the face of the label : " Chordeiles texensis, 

 Lawr." " Texas ""5a 116 ; " and on the back of the label : " Type " 

 " Presented by Capt. J. P. McCown." The label of the female is iden- 

 tical save for the sex and number, which read : " $ b 116." In color 

 both birds are inseparable from Tfexas specimens. There seems to be 

 now no way of determining the exact locality at which these speci- 

 mens were collected ; and as it seems desirable to have an exact type- 

 locality, I now designate as such Ringgold Barracks, near Rio 

 Grande City, since this is a locality which Captain McCown is known 

 to have visited. 



13732°— Bull. 86—14- 



S 



