214 MR. SCLATER ON BIRDS FROM BRITISH GUIANA. [Feb. 1, 



Bonaparte's Thilius major may hare been possibly founded upon 

 an example of this species ; but the description is too short to be 

 certain; and, as I have been kindly informed by M. Alph. Dubois, 

 the type specimen (stated to be in the Brussels Museum) cannot be 

 found. I have therefore named this interesting addition to the 

 Guianan avifauna after its discoverer, who has supplied me with the 

 subjoined note on it. 



Bill of AgelcBUs imthurni. 



" A considerable flock of these birds, numbering about 40, was 

 always to be found during the three days I remained in the neigh- 

 bourhood, in the trees on the edge of the forest round the open 

 plateau from which the Kaieteur falls. They attracted considerable 

 attention by their incessant chattering, their note being like, but far 

 less shrill than, that of Cassicus persicus. These cries were kept 

 up throughout the day, and were almost the only bird-notes to be 

 heard about noon. The Indians of my own party, who were uot 

 from that district, had never seen the birds before ; but some Acka- 

 wor Indians who lived in that neighbourhood declared that they 

 knew them well : this, as Indians are very careful observers of birds, 

 shows almost conclusively that the species is local in Guiana. Be- 

 tween us we secured three specimens." 



5. 0CHTH(ECA MTJRINA, Scl. 



OcIMceca murina, Scl. P. Z. S. 1871, p. 749. 



An example from the Corentyn river, obtained in July 1879. 



I am glad to have the habitat of this species confirmed, as it is by 

 Mr. im Thurn's specimen, and by others collected in the same district, 

 I believe, by Mr. C. Barrington Brown, one of which is in my 

 collection. 



6. Heteropelma igniceps, Scl. 

 Heteropelma igniceps, Scl. P. Z. S. 1871, p. 750. 



" Three skins of this species were obtained by Mr. im Thurn on the 

 Corentyn river (1879) and one on the Essequibo. The two former 

 quite agree with my typical specimen ; the latter has a rather paler 

 crest, and is probably a female. 



Mr. im Thurn tells me that this bird is common enough through- 

 out the colony, not only near the coast, but also in the interior ; on 

 the Rupumini savannas, bordering on the Brazil, he has seen many 

 examples. 



