it 





th 



984 



REVIKW OP AMERICAN UUIDS. 



[taut F. 



Colyle, however, the relationship, except in eoh)ration, is very slight, 

 as the nostrils are superior, without overhuuginf? uieuibrane ii,s in 

 Cotijli',; tlie lower end of tarsus destitute of leathers (llie upper, on 

 the contrary, being provided with them) ; the lateral claws hiiort, 

 much curved, and not reaching beyond the base of the middle. The 

 bill is much stouter, and the body more robust ; the edge of wing 

 without hooks, in these respects ditl'ering from Ste.UjUhiitmj^r. 



With somewhat the fuiness of form of Procfue, the bill resembles 

 the latter in having the nostrils superior, exposed, and vwthout over- 

 hanging membrane. The frontal feathers are soft, but with short 

 bristles lining the base (.'' the upper jaw, and a few on the side of the 

 lower, but none in the chin. The bill is more depressed than in 

 Prague, but similarly shaped ; the lower edgt; of the upper niiUKlibk' 

 much sinuated, or quite convex to the anterior extremity o'" the 

 nostril, and then passing into an equally concave curve to the tip. 

 Both jaws are more depressed, and their upper outlines less conve.x, 

 especially towards the base, than in Progne. The feet are weaker, 

 but the adhesion of the toes much as in Progne — the basal joint of 

 the median being free for about hulf internally, a little less extoiiially. 

 The upper joint of the tarsus is covered with feathers, which are 

 attached along the inner edge in a narrow line for half the length, 

 or more than half the length (even three-fourths). This feature is 

 quite peculiar to Phseoprogne, not existing at all in Progne, nor to 

 anything like the same extent in any other American Swallows. The 

 tarsal scutella; are so much fused as to be almost undistingui.«!iable. 

 The wings are more falcate, the feathers broader and less curved 

 than in Progne ; the tail but slightly forked ; the lateral feathers 

 without the gradual attenuation of Progne. 



The species of this group belong strictly to South America, but 

 are not well determined. I give below the two which seem to be 

 contained in the specimens which I have examined. None have 

 any metallic gloss, as in Progne — resembling in color Cotyle and 

 Slelgidoplerijx more than any other genera. The form is more that 

 of Petrochelidon, the nostrils being equally superior and uncovered, 

 and the tail is somewhat similar. The bill is, however, much stouter, 

 long''r, and the commissure is sinuated, not nearly straight. 



Synopsis of Species. 



Common CnARACXERS. — Above and along sides dull smoky brown, 

 without metallic lustre ; a fainttr pectoral band of the same. 

 Rest of under parts white. 



Sides of neck white, passing around on the nape into a narrow 



