INSESSORES. 



183 



conspicuous frontal band of white, which is frequently slightly tinged 

 with brownish, but is never of the dark chestnut found in II. fuJva. 

 In the specimens of the latter, now before us, there is no trace of the 

 black of the throat which characterizes the former. 



As a bird of Western South America, we are not aware that this 

 bird has been previously noticed. 



2. Petrochelidon cyanoleuca (T7e//?.), 



Hirundo cyanoleuca, ViElLL. Nouv. Diet. XIV, p. 509. 

 Hiruvdo minuta, De Wied, Beitr. II, p. 369. 

 Hirundo melampi/ga, Light. Verz. p. 57. 



Temm. Pi. Col. 209, fig. 1. 



Several specimens are from Peru. Mr. Peale states : 

 " We found this species very common in the month of July, about 

 Lima and Callao, in Peru. It was quite familiar, entering the court- 

 yards of the houses, and coursing within a few feet of pedestrians," 



2. Genus COLLOCALIA, G. R. Gray, List. Gen. Birds, p. 8 (1840). 

 1. COLLOCALIA CINEREA {Gin.). 

 Hirundo cinerea, Gm. Syst. Nat. II, p. 1026 (1788). 



Macropteryx leucophceus, Peale, Zool. Exp. Exp. Birds, p. 178 (1st ed. 1848).* 



Atlas, Ornithology, Plate XII, fig. 4. Adult. 



This species is nearly related to the succeeding, and is most readily 



* "Pale soot-color; beneath lighter; crown, wings, and tail, darkest; webs, of the 

 greater mng-cowerts, undulated ; bill very minute and delicate; forehead full, round ; 

 eyes large ; irides dark brown ; feet dusky red ; tail slightly forked. 



"Total length, five and one-tenth inches; wing, from the carpal joint, five and three- 

 tenths inches ; tail, two and four-tenths inches ; tarsi, seven-twentieths of an inch ; middle 

 toe, including the claw, four-tenths of an inch; claw, three-twentieths of an inch; bind 

 toe, one-fourth of an inch ; claw, one-tenth of an inch ; bill, one-tenth of an inch ; to the 

 corner of the mouth, nine-twentieths of an inch." 



