RENDAHL, BIRDS FBOM PANAMA, COSTA RICA AND NICARAGUA. 27 



lowing relations to those of M. 1. nigricapillus (+ bangsi mm ^ 

 greater, — mm. smaller than the latter). 



Wing 



Type epecimen, ö^ ad. Panama 

 (Nelson) 



Six. cTcf. E. Costa Kica (Ridg- 

 way) 



+ 4 

 -0,7 



Tail 



Culmen 



Tarsus 



+ 7,1 

 — 0,6 



2,7 



0,3 



-f 1,4 

 -0.7 



In consequence of the above statements, I think, that 

 the Costa Rica birds, which Ridgway refers to M. 1. hangsi 

 must be intermedlate between the latter, as characterized by 

 Nelson, and true M. 1. nigricapillus, but doubtless belong 

 to the former race. I leave the question open, if Nelson's 

 type-specimen is an extremely developed example, or if this 

 subspecies in the southern parts of its range shows a greater 

 divergency from nigricapillus, than in the northern parts. 

 Additional researches are very desirable. The present speci- 

 mens confirm my supposition. Those, which I have determined 

 as M. 1. hangsi, have the pileum sooty black, abruptly defined 

 against the decidedly greenish olive back. The tail-feathers 

 have no or nearly imperceptible edgings of an indistinct light 

 colour on the inner webs. 



The two males of Jf . 1. nigricapilhis from Nicaragua 

 have the pileum clove brown, the back brownish olive and 

 the tail-feathers very distinctly edged on the inner webs 

 with cinnamon rufons. 



The average measurements are as follows: 



Wing I Tail 



Culmen 



Tarsus 



i 2 ef ef , M. 1. nigricapillus (Nicaragua) 

 4 d^cT» M. 1. hangsi (Costa Rica) . . 



82 

 79,5 



80 



77,7 



17,5 

 16,6 



19 

 18,5 



143. Tyrannus tyrannus Lin. 

 del Norte, Oct. 29. 



1 ^, Nic, San Juan 



144. Tyrannus melancholicus satrapa Cab. et Heine. 

 1 ef (U. Z. M.), C. R., Siquirres, Aug. 12; 1 J*, C. R., 



