18 ARKIV FÖR ZOOLOGI. BAND 12. N:0 8. 



Norte, Marcb 20—30, April 4—5, Nov. 4; 1 J (U. Z. M,), 

 same locality, April 4. 



j>Iris light yellow (2). light yellow, light red, bro wn (<?).» 



97. Curucujus melanurus macrourus Gould. — 1 J', 

 Pa., Pacora, March 4. 



98. Trogon melanocephalus illaetabilis Bångs. — 1 J^ 

 Nic, R. Ometepe, Muyogalpa, Jan. 6; 1 J", Nic, G. Los Is- 

 letoz, I. de Vela, Febr. 8; 2 c? c?, Nio., G. Granada, Dec. 21 

 and 25. 



Mr. Bängs (Proc. Biol. Soc. Wasb. XXII, 1909, p. 30) 

 separated the Costa Rica birds from tbe nortbern ones. He 

 also remarks, that specimens from western Nicaragua appear 

 to be quite the same as tbose from Costa Rica, distinguisbed 

 from true T. melanocephalus by a paler and grayer colour of 

 head, tbroat and chest (dark gray-slate to blackisb slate 

 instead of black in adiilt male), averaging sligtbly larger size 

 and sligbtly heavier bill. 



As to tbe colour of tbe adult male Mr. Ridgway, bow- 

 ever, states (Birds Nortb Middle Am. V, 1911, p. 756) not 

 only uniform black as the characteristic colour of the 

 nortbern form, but also slate black. He describes the male 

 of the Southern form as »more slaty, sligtbly larger». From 

 this it seems very difficult to settle some distinct difference 

 with regard to the coloration of the males of the two forms. 



Unfortunately no specimens of this Trogon were collected 

 by Dr. Bovälltus in eastern Nicaragua, and the only ones 

 in the collections of the Swedish State Museum is a pair 

 (J*, 5) from Honduras. Tbey are, bowever, immature birds. 



To judge from the present specimens, I cannot help 

 suspecting, that it may be a direct connection between tbe 

 intensity of the black colour and the desreloping of the 

 coloration on the whole. The richest coloured specimen 

 is that from Ometepe. Tbe back is very strongly inter- 

 mixed wIth violet, the upper tailcoverts are rich violet 

 with a purplisb gloss. Head, neck and chest are dark slate 

 black. The second is the bird from G. Granada ^^is. In 

 this specimen as well, there is a distinct mixing with 

 violet on the whole back, although not so strong as in the 

 preceding specimen, the upper tail-coverts are more bluish 



