508 OHNITllOLOGY. 



844, i arf. (parent of preceding); East IliunboUU Mountains, July -0, lS(iS. S), 

 — 17^ — (?) — 4J. Bill, deep black; interior of tbe moutb, flesh-color; iris (very narrow), 

 iiiubcr; eyelids, ocbraceoiis-biown; tarsi, pale asliylilaceous, tlie toes darker. 



037, H ad; Upper Iluinboldt Valley, September 1!), 18GS. 8^— 17 ■— (?)—;".. 

 Same remarks. 



l.J7i>, <5 ail; Uintab Mountains, Utah, July 7, 18G9. 8>— 17-,'. Bill, black; iris 

 (narrowly), brown; eyelids, dull ocLraceous; tarsi and toes, dull dusky purplish. 



Chokdeiles rorETUE. 



Niglii-IIawk. 



/?. Jioiryi. 



(Kotv'a-look of the Washoes; Wy' -e-itp-ah' -oh of the Slioslioncs.) 



ChordeUen hennji, Cassim, Illust. Birds Cal., Texas. &c., 1855, :239.— Baiud, Birds 

 N. Am., 1858, 153, 921i ; Cat. X. Am. Birds, 1859, No. 115. 



Chordeiles popctue var. henri/i, Allen, Bull. JIus. Comp. Zool., Ill, 1872, 179. — 

 B. B. & 11., Ilist. N. Am. Birds, II, 1874, 404, pi'. XLVi, fig. 4.— tlENSUAW, 

 1875, 307. 



Chordeiles vhginianus var. henryi, CouES, Key, 1872, 181 ; Check List, 1873, No. 

 2G7a. 



ClionU'ilcs rirghiiannis. h. henryi, CoUES, Birds N.W., 1874, 2G4. 



Ckurdcilcs popctue, Cooper, Orn. Cal., 1, 187(t, 343. 



The Nij>lit-IIawk was a common summer inhabitant of the country 

 traversed. It was most numerous during the months of August and Septem- 

 ber, wlien just before dark they congregated in immense numbers and over- 

 spread in scattered flocks tlio.se locahties wliere insect life most abounded- 

 In July, tlifir well-known booming sound was often heard. During the 

 greater portion of the day they remained inactive, and were then frequently 

 surprised during their siesta, as they perched on a horizontal liinl), a board 

 of a fence, or a stick lying on the ground, their position being, according to 

 our experience, invariably lengthwise with the perch.' While thus resting 

 they often evince a strong attachment to the perch they occupy, returning 



'This ilisposiliou to sit lengthwise with the perch may be considered by some a 

 constant habit of the Capriniulgida'; we .should be inclined to so regard it ourselves, 

 Vere it not for the fa<!t that the first specimen oi' Aulrostomus voeiferiix \\v ever killed 

 was shot while asleep on a small branch of a hickory tiee, its position being at right- 

 iiigles with the direction of the twig, iu the uuinuer usual among the true "perchers" 

 (I'asseres, etc.). 



