158 Mr. P. L. Sclater on the 



aspersus. Fem. Snpra fusca, in dorso postico alls et 

 Cauda nigincaiis ; superciliis distinctis et corpore subtus 

 clare ocliraceo-f uscis ; tibiis et crisso nigricantibus ; ros- 

 tro nigro, pedibns obscure cornels : long, tota l()"5j alse 

 5"2, caudee rectr. med. 4'4_, ext. 3"3. 

 Hab. Central Mexico ; vicinity of Mexico city [Boucard 

 in Mus. S.-G.). 



Mus. P. L. S., S.-G., et Com. de Berlepsch. 

 I have little doubt, as I have said above, that this is the 

 true Q. palustris of Swainson; but it will only create more 

 confusion to supersede the very appropriate name tenuiros- 

 iris given by the same author. 



The species seems only to be found in Central Mexico. 

 The figures (Plate V.) are taken from specimens in my col- 

 lection. 



C, HOLOQUISCALUS. 



Under this head Cassin has placed the smaller species of 

 Quiscalus which are distributed throughout the Antilles and 

 into the northern portion of South America. In the An- 

 tilles each island appears to have its peculiar form, and I 

 will therefore take the species geographically, beginning with 

 Cuba. 



Clavis specierum. 

 A. Mas niger unicolor, 



a. Feminse nigrse, marl similes. 

 «'. Rroost recto, 



crassitie majore (7) gundlachi. 



crassitie minore (8_) ni(jei\ 



V , Rostro incurvato, 



rostro crasso : alis longioribus (9) crassiro'sfris. 



rostro tenuiore : alis brevioribus .... (10) bi-achypterus, 



r(ll) injiexirostris. 

 I (12) guadeloupensis. 



h. Feminse fuscse, mari dissimiles* tj (1.3) luminosus. 



{\4:) foi'tirostris. 

 (^(15) lugubris. 



* I am not sufficiently well acquainted with this group of species to 

 attempt to give diagnoses. 



