184 BULLETIN 186, UNITED STATES NATIONAL MUSEUM 



Family CAPRIMULGIDAE 



EUROSTOPODUS MACROTIS CERVINICEPS (Gould) 



Indo-Chinese Greater Eared Nightjar 



Lyncornis cerviniceps Gould, Icones Avium, pt. 2 (Monograph of the Capri- 

 mulgidae, pt. 1), 1838, pi. 14 and text ("China or the adjacent islands," 

 error; type locality corrected to Province of Tra'ng, Peninsular Thailand, 

 by Robinson and Boden Kloss, Journ. Nat. Hist. Soc. Siam, vol. 5, No. 2, 

 1923, p. 140). 



Lyncornis cerviniceps, Gyujenstolpe, Journ. Nat. Hist. Soc. Siam, 1915, p. 232 

 (Khun Tan) ; Kungl. Svenska Vet.-Akad. Handl., 1916, p. 107 (Khun Tan). 



The beautiful eared nightjar is fairly common, at least locally, in 

 the lower hills of our provinces. Eisenhofer sent to Stockholm two 

 undated specimens from Khun Tan. I took one at 3,000 feet on 

 Doi Ang Ka, May 6, 1931 ; another at Ban San Tha, June 11, 1936 ; 

 a third at Ban Mae Sariang, October 24, 1936. 



The Ang Ka example was one of about 10 individuals hawking at 

 dusk over a clearing in pine-forest. The stomach contained small 

 moths and cicadas and the esophagus a large beetle. 



Gyldenstolpe collected a subadult male at Khun Tan in May, 1914. 

 My specimen of June 11 is molting both the remiges and the rectrices. 



The bird from Doi Ang Ka, a female, had the irides dark brown ; 

 the bill brownish pink, with tip and apical half of the culmen brown ; 

 the interior of the mouth pink; the feet and toes fleshy brown; the 

 soles fleshy ; the claws horn-brown. 



An adult male has the aigrettes and the crown generally gray- 

 brown, the feathers finely vermiculated with blackish, some with a 

 large black spot near the tip, those of the occiput black, narrowly 

 tipped gray -brown; a nuchal collar rich buff; the remaining upper- 

 parts handsomely mottled and barred everywhere with gray-brown, 

 buff, chestnut, and black ; the throat crossed by a white band, which 

 is connected with the nuchal collar ; the remaining feathers of throat 

 and breast blackish brown, narrowly tipped chestnut ; the rest of the 

 underparts banded buff and blackish brown, with black bases of the 

 feathers showing through everywhere. An adult female is similar, 

 but has the gray-brown portions of the plumage replaced by rich 

 buff, the chestnut parts much more reddish. 



The two types of coloration in this species seem to represent sexual 

 dimorphism rather than mere dichromatism. Of five males before 

 me, four are "gray" birds; of nine females, eight are "red." The two 

 exceptional specimens may easily result from incorrect sexing by the 

 Asiatic collectors. 



