106 Ridgway — New American Birds. 



Alopochelidon*, new genus. 



Tail less than half as long as wing, slightly emarginate, all the rectrices 

 broad and rounded at tip; wing-tip little if any longer than distance from 

 bend of wing to end of longest secondaries; above dull grayish brown. 



Similar to Stelgidopteryx but differing in less adhesion between toes (in 

 this respect agreeing with Pygochelidon), and in entire absence of re- 

 curved tips to barbs of outer web of outermost primary. 



Type, Hirundo fucata Temminck. 



Orochelidonf , new genus. 



Differing from Atticora, Neochelidon and Notiochelidon in having the 

 subbasal phalanx of middle toe entirely free from the outer toe; from 

 Diplochelidon in having the tail much less than two-thirds as long as 

 wing, and forked for less than one-fourth its length (nearly even in one 

 species), and nasal fossae occupying at least basal half of maxilla. 



Type, Petroehclidon murina Cassin (=Hirimdo cincrea Gmelin?). 



Diplochelidon;, new genus. 



Nearest Orochelidon, but differing in having the tail more than three- 

 fourths as long as wing, forked for one-half its length, the lateral rec- 

 trices attenuate; nasal fossse very small, occupying much less than basal 

 half of maxilla. 



Type, Hirundo melanoleuca Maximilian. 



Lamprochelidonfl, new genus. 



Nearest Tachycineta and Calliclielidon but nasal operculum entirely 

 feathered, the feathering of the frontal antiag extending to the anterior 

 end of the nasal fossae and partly hiding nostrils. 



Type, Hirundo euchrysea Gosse. 



K'AXooTtoS, fox-like; ^eAiSgjj', a swallow. 

 •)■ w Opo$, a mountain; ^AzScok, a swallow. 



\Aiit\6oZ, double; ^cAtScjj', a swallow; with reference to its resem- 

 blance to swallows of two different types. 

 \\Aajn7tp6s, shining; x E ^- l ^^> v > a swallow. 



