VOL. XVI, "I 



189:J. J 



PROCEEDINGS OF THE NATIONAL MUSEUiM. 



(Ul 



Measiuemeuts of the three .specimens, together witli a male of T. 

 xanthojrygius, are as follows : 



TACHYPHONUS XANTHOPTGIUS Sci.. 



TACHTPHONUS BTJBRIFRONS I,awk. 



47454 U. S. 

 7169 C. R. 

 7168 C. R. 



cf ad. 

 cf ad. 

 9 ad. 



Angostura, Co.sta Rica. . 

 Reventaz6n , Costa Rica . 

 do 



Jan. 8,1867 

 Feb. 24, 1892 

 ....do 



3.25 2.43 

 3.25 2.43 

 3.15 2.37 



0.63 

 0.60 



0.78 

 0.80 

 0.80 



0.55 

 0.52 

 0.50 



Should this bird prove to be distinct from T. xanthopygins Scl., as I 

 believe it will, we must, if the A. O. IT. canons of nomenclature are 

 adhered to, restore the name Tnchyphonus rubrifrons Lawr., for which 

 Mr. Lawrence substituted the name T. propinqiins when he discovered 

 that the red color on the forehead of the type specimen was an acci- 

 dental stain. (See Canon xxxi, A. O. U. Code of Nomenclature.) 



5. Pachyrhamphus oniatus Clicrrie. (Proc. U. S. Nat. Mus., xiv. No. 8.55, 1891, 338.) 



An apparently immature female belonging to the Museo Nacional de 

 Costa Rica (No. 1472, San Jose, J. C. Zeledon), is much like the type 

 (an adult female), but differs in having the back, etc., more grayish 

 olive-green, which, instead of being quite the same hue from upper 

 back to tail-coverts is much tinged posteriorly with light sandy brown 

 or fulvous, this being especially marked on loAver and ])osterior scapu- 

 lars and longer upper tail-coverts ; the pilenm is lighter, rather russet 

 than chestnut: the broad pale margins to wing-coverts and secondaries 

 are much paler, those of the coverts being chiefly buff, those of second- 

 aries pale olive-buff'; the sides of the head are paler, and the upper 

 throat is nearly white, like chin. The white frontal mark is much less 

 tinged with butt" near base of culmeu; the black patch covering nape 

 and sides of occiput is less sharply defined and less intense black, and 

 the adjacent color of hind neck is decidedly paler than the back, pro- 

 ducing an indistinct collar. Length (skin), 5.50; wing, 2.85; tail, 2.20; 

 exposed culmen, 0.42; tarsus, 0.70; middle toe, 0.45. 



6. Pachyrhamphus cinereiventris 8*'l. 



Four adult males in the collection of the Museo Xacional de Costa 

 Eica are typical of this form, all having the whole back intense blue- 

 black, without any gray across the hind neck. This is the case even 

 in an immature male (same collection, No. 4432, May 3, 1S90), in Avhich 

 the greater part of the rump is olive, instead of slate-gray, and the 

 wings largely in immature plumage. The shade of color of under 

 parts is very uniform (intermediate between slatf-color and slate-grav). 



