600 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



at base, 11.18-12.19 (11.43); tarsus, 18.80-20.32 (19.56); middle toe, 

 14. 48-14. 73. ' 



Advltfemale.—Length (skins), 139.70-152.40 (146.05); wing, 75.69- 

 78.23 (76.96); tail, 61.47-62.99 (62.23); culmen (from base), 17.78; 

 depth of bill at base, 13.97; width of mandible at base, 11.18-12.19 

 (11.68); tarsus, 19.81-20.83 (20.32); middle toe, 14.73.' 



British Guiana to lower Amazon Valley (Santarem); Isthmus of 

 Panama 1 ' 



Coccoborus cyanoides Lafresxaye, Rev. Zool., 1847, 74, part (adult male described, 



but not the female*). 

 lOyanoloxia] cijanoldfs ^O'sxf arte, Consp. Av., i, 1850, 502 ("Panama"). 

 (?) Guiraca cyanoides Sclatbr, Cat. Am. Birds, 1862, 101, part (Cayenne).— 



(?) Sclatbr and Salvin, Proc. Zool. Soc. Lond., 1866, 566 (Ucayali, e. Peru); 



1867, 750 (Chyavetas, e. Peru).— (?) Finsch, Proc. Zool. Soc. Lond., 1870, 



582 (Trinidad)— (?) Pblzeln, Orn. Bras., 1871, 222 (Cuyubi, Engenho do 



Gama, Salto Girao, Borba, and Maribatanas, Brazil) . 



' Four specimens. 



^ Two specimens. 



' There is an adult female Cyanocompsa from Panama in the collection of the Ameri- 

 can Museum of Natural History (No. 41185, J. McLeannan, collector) which agrees 

 very closely with the Cayenne and Santai-em females in coloration except that the 

 upper surface is slightly more rufescent, or about intermediate in color between that 

 of the same parts in the female of C. cyanoides and Panama examples of C. conereta 

 cyanescens. The measurements agree sufficiently with those of unquestionable 

 females of C. ct/anoides except those of the bill, which agree best with C. conereta 

 cyanescens. To which form the specimen in question should be referred I am unable 

 to determine without a much larger series. 



*Lafresnaye evidently had two very distinct birds in hand when he described his 

 Coccoborus cyanoides. The supposed female or young bird, described in Latin, and 

 said to have come from Panama, would seem from the description to be clearly the 

 Panama form which has generally been known by the specific name cyanoides; but 

 the adult male described below is not that species, but another which resembles much 

 more in coloration the common C. cyanea, of wide range in eastern South America, 

 and differing chiefly in the more elongated and conical bill, as Lafresnaye explicitly 

 states, a free translation of his description being as follows: "The coloration of the 

 adult male is . entirely like that of the Coc. cyaneus, blue grosbeak [i. e. , G cyanea] ; 

 that is to say, it is everywhere of a deep dark blue, enlivened by a beautiful celes- 

 tial blue upon the feathers of the forehead, of the eyebrows, of the corners of the 

 lower jaw, and upon the smaller wing-coverts. It differs from it, then, only by a 

 long conical beak, much more elongate, less swollen laterally at its base, but more 

 elevated near the forehead and much less arched above. ' ' 



Having been able, through the courtesy of the officers of the Boston Society of 

 Natural History, to examine Lafresnaye' s types, I find that the male specimen exactly 

 corresponds with Lafresnaye's description, as given above; but the supposed female 

 or young bird is neither of the same species nor the Panama form of C. conereta 

 formerly called cyanoides, but is a young example of Guiraca cserulea! Possibly it 

 may not be the specimen from which Lafresnaye took his description of the sup- 

 posed female or young, but there is a possibility that it may be; therefore, no other 

 course seems proper than to transfer the name cyanoides from the Panama form of 

 C conereta to the Amazonian species to which Lafresnaye's adult male of his Cocco- 

 borus cyanoides unquestionably belongs. 



