BIRDS OF NORTH AND MIDDLE AMKRlfA. 2( 



rliL Basal j)lialaiix of uiiddli' toe cntirrly a<llu:reiil to ouU-r Uie. 

 e. Tibio-tarsal joint entirely hidden by tibial feathers; edge of outermost 

 primary roughened by recurved tips to the barbs (except in young and 

 some females); upper parts dull grayish brown (sometimes dull whitish 

 1(11 luinp'l; luidt'i' pai'ts neither miiforiu souty gray noi' jwrtly black." 



Stelgidopteryx (p. r)(>j 



ee. Tibio-tarsal joint exposed; edge of outer primary iKjrnial ( not roughened); 



upper parts never entirely grayish brown nor with whitish on rump; 



under j)arts sooty gray or brown, or with more or less of black. 



/. Tail nuich less than two-thirds as long as wing, forked for le.ss than 



one-fourth its length (sometimes nearly even), the lateral rectrices 



l)road; nasal fossfe occupying at least ba-sal half of maxilla; under 



parts sooty gray, becoming bla(rk on under tail-coverts or dull white, 



becoming sooty gray on throat Orochelidon (extralimital) '' 



ff. Tail more than three-fourths as long as wing, forked for iialf its length, 

 the lateral rectrices narrow and attemiate; nasal fossa' very small, 

 occupying much less than basal half of maxilla; under parts pure 

 white, with under tail-coverts and ]>aiid across chest glo,«.My blue- 

 black Diplochelidon (extralinutal) '' 



er. Subbasal phalanx of middle toe adherent for basal half to outer toe (the 

 basal phalanx of course entirely adherent). 

 (/. liasal i)halanx iA nuddle toe with only the basal lialf adherent to inner 

 toe; til)ial feathers short, not covering tibio-tarsal joint, not white; back 

 grayish bniwn ; under parts of body largely white . .Notiochelidon (p. 65) 

 d(1. TJasal phalanx of middle toe adherent for most of its length to inner toer 

 tibial feathers full, covering tibio-tarsal joint, white, forming a conspicu- 

 ous tuft; back not grayish brown or else under parts of body without 

 any white. 

 e. Tail about half as long as wing, forked for less than one-fourth its length; 

 hallux nmch shorter than inner toe; wing-tip nuich shorter than dis- 

 tance from bend of wing to tip of longest seccmdaries; above sooty 

 blackish becoming grayish brown or sooty gray on rumji; beneath 



sooty brown Neochelidon ( j). 67) 



I'p. Tail at least two-thirds as long as wing, forked for nearly half its length; 

 wing-tip equal to or longer than distance from bend of wing to tip of 

 longest secondaries; hallux as long as inner toe; uniform glossy blue- 

 black Avith a broad white Viand across lower breast. 



Atticora (extralimital).'' 

 <tn. Nostrils oi^ening lati'rally, in lower portion of na.sal foss;e, narrow, longitudinal, 

 overhung by abroad membraneous operculum (this sometimes entirely covered 

 l)y feathers). 



"Except, sometimes, a l)lackish spot or longer under tail-coverts. 



^> Orochelidon, new genus. (Type, I'etnn-lie/ldon mnritia Caii»[n,=Hirundo cinrrea 

 (inielin?) There is considerable difference in form between 0. murina (nmrca'!) 

 and <l. (indicolii, the latter having a nearly even instead of deeply emarginate or 

 forked tail and nmch less depressed l)ill. (Andean region of Ecuador, Peru, and 

 Bolivia; two species.) ("Opo?, a mountain; ^£/li(5ct>>', a swallow. ) 



'■Diplochelidon, new genus. (Type, Illrundo viekmoleuca Maximilian. ) (z/ittAoo?, 

 double; ;f£A?5cij', a swallow; with reference to its resemblance to swallows of two 

 different types. ) South American (monotypic). 



''.l//(Vo7'a Boie, Isis. 1S44, 172. (Type, Hiruudo j'axciata Gmelin.) South .\nu»r- 

 ican (monotypic). 



