566 PROCEEDmGS OF UNITED STATES NATIONAL MUSEUM. [1885. 



the white. Lining of wing pure white, the edge of wing and axillars 

 tinged with sulphur-yellow ; crissum white, faintly tinged with yellow. 

 Maxilla light brown, with paler tomium ; mandible whitish ; legs and 

 feet grayish brown (plumbeous in life?). Wing, 2.50; tail, 2.15 ; cul- 

 men, .60 ; bill from nostril, .30 ; tarsus, .89 ; middle toe, .45. 



This species is so very distinct as not to require comparison with any 

 other at present known, being wholly unique in and immediately recog- 

 nizable by, the pure white median lower parts, strongly and abruptly 

 contrasted with the bright tawny or ochreous lateral portions. It be- 

 longs decidedly to typical Vii'eo, and not to the section Vireonella, as 

 defined by Professor Baird in his " Eeview of American Birds" (p. 326). 



The species is dedicated to Prof. Spencer F. Baird, among whose 

 numerous valuable contributions to ornithological literature is an elabo- 

 rate monograph, by far the best and most complete extant, of the North 

 and Central American Vireo7iidce, in the work above mentioned (pages 

 322-400). 



Six skins and thirteen alcoholic specimens are rei^resented in the 

 collection. 



-26. Cyclorhis insularis, Ridgw. 



Cijclorhis infuilaris, RiDGW. Descr. New Sp. B. Cozuiuel, February 26, 1885, 2. 



Sp. char. — Similar to C.Jlaviventris in color of i^ileum, but agreeing 

 with C. ochrocephala in coloration of the lower parts. 



Adult 2 (type, No. 102,659, Cozumel I., Yucatan, January 28, 1885) : 

 Pileum dull brownish gray, bordered anteriorly and laterally by a well- 

 defined frontal baud and superciliary stripe of bright rufous; malar 

 region, auriculars, and nape, cinereous, the chin similar but paler. Re- 

 maining upper parts uuiforai olive-green, decidedly duller, or less green, 

 than in C.Jiavivenfris or G. ochrocephala. Throat, jugulum, side of breast, 

 sides, and flanks, light olive-yellow; breast, abdomen, anal region, and 

 crissum, white ; lining of wing pale sulphur-yellow, much paler than in 

 the allied species. Maxilla and terminal i)ortiou of mandible pale brown ; 

 basal half of mandible dusky (plumbeous or bluish in life'?); legs and 

 feet light brown (fleshy in life'?). Wing, 3.30; tail, 2.60; culmen, .85; 

 bill from nostril, .50; depth, .38; tarsus, 1.00; middle toe, .55. 



Another specimen (No. 102,658, January 25), also a female, but evi- 

 dently a younger bird, is decidedly duller in color, the j>ileum being more 

 brownish, the rufous frontal band and superciliary stripe paler and les8 

 sharply defined, and the white of the abdominal region much more re- 

 stricted, being apparently confined to the central and lower portion of 

 the abdomen itself. This last feature, however, is to a great extent 

 owing to the " make" of the skin, which is considerably contracted, but 

 perhaps depends more on immaturity of the specimen. Wing, 3.00; 

 tail, 2.30. 



It is a singular fact that the only other species of the genus, besides 

 C. Jiamventris, Lafr., which this resembles, is the far separated G. ochro- 



