610 BIRDS FROM COSTA RICA K IDG WAY. 



Adult male (type, No. 128840, V. S. Nat. Mils,,* JUieua Arista, Costa 

 Eica, August 4,1892; Castro y Feinamlez) : Head (all round), hind 

 neck, sides of neck, entire upper parts, sides, and flanks, uniform dull 

 indigo-blue, the larger wing-coverts, reniiges, and rectrices, however, 

 dull black except on edges; chest and breast (except laterally), belly, 

 anal region, and under tail coverts bright yellow, changing- gradually 

 from rich Indian-yellow on the chest to lemoiiyellow on the under tail- 

 coverts; axilhirs canary-yellow; under wing-coverts mixed primrose- 

 yellow and white; inner webs of remiges dull brownish gray, paler on 

 edges, these becoming Avhitish toward base of quills; thighs uniform 

 dusky indigo-blue. Bill entirely black; legs dusky horn-color; feet 

 dull blackish. Length (skin), about 5.G0 (tail imperfect) ; wing, 3.42; 

 exposed culmen, ().(»(); depth of bill at base, 0.35; tarsus, 0.85; middle 

 toe, 0.(50. 



Mr. Cherrie sent an excellent description of this bird, but it has 

 unfortunately been mislaid and I have therefore been obliged to pre- 

 pare a new one. 



Although a|>parently very different from B. arccn Scl. and Salv. in 

 the extensively and uniformly dusky sides and flanks, it is so closely 

 similar in other features of coloration that I strongly suspect it may 

 only iei)resent an extreme variation of that species. At any rate, addi- 

 tional specimens will be necessary to establish its validity. 



4. Tachyphonus rubrifrons Lawr. 



Although Dr. Sclater considers this.to be the female of T. xanthopy- 

 giKS, two of the three specimens now before me are marked as males 

 by their collectors (J. Carmiol and N. Carranza), 



The i^air collected by Senor Carranza (Nos. 7168 and 7109, Museo 

 Nacional de Costa Rica, Reveiitazon, Costa Rica, February 24, 1892), are 

 almost exactly alike, and both very similar to No. 47454, U. S. National 

 Museum, collected at Angostura, Costa Rica, January 8, 1867, by J. 

 Carmiol. The two nmles differ from the female in the much stronger 

 yelh)w tinge to the under tail-coverts, some of the middle feathers 

 being, in fact, almost pure yellow, but no other difference of coloration 

 is observable. The Carranza male differs from the Carmiol specimen 

 ill having the chin and throat purer gray, and the chest strongly tinged 

 with yellowish olive. 



If really referable to T. xcuithopyoiuH^ the plumage rei)resented by 

 T. ruhrifroriH must, therefore, be that of the young male as well as the 

 female. 



According to the collector, the iris is reddish and the bill and feet 

 black in both sexes. 



No. 8287, Museo Naiioiial de Costa Rica. 



