366 bulletin: museum of comparative zoology. 



Jalapa, 19,1 unsexed; Orizaba, 299; Quintana Roo, 1 cf ; Tehuan- 

 tepec, 1 cf; Yucatan, 1 cf, 1 9,2 unsexed. British Honduras: 

 Belize, 1 cf . Honduras: Yaruca, 1 cf , 2 9 9; Ceiba, 1 cf. Costa 

 Rica : Sipurro, 1 d^ . Colombia : Santa Marta, 2 cf cf • Unspecified, 

 1 immature. Total, 32. 



C. s. pallidula: — Lower California: San Jose del Cabo, 8 cfcf, 

 10 9 9 . Total, 18. 



Remarks. — Eighteen adults of this new form, laid out beside a 

 series of nearly double that number from various points in Mexico and 

 Central America, are strikingly different; the pale, dull colors of the 

 Lower Calif ornian bird cannot be matched by any specimen in our 

 series of true sulcirostris. The difference is noticeable at a glance but 

 rather difficult to describe. Brewster (Bull. M. C. Z., 1902, 40, p. 

 100), in his account of the birds of the Cape Region of Lower Cali- 

 fornia, states that the Groove-billed Ani is not known to occur in 

 central and northern Lower California, and that the colonies which 

 have become established in the Cape region were probably originated 

 by birds which came from western Mexico. However this may be, 

 the isolated colony of Cape St. Lucas has developed into a very dis- 

 tinct form, worthy of recognition. 



THE FORMS OF DENDROPLEX PICUS (GMELIN). 



Having discovered in the Lafresnaj'e collection the type of Dendro- 

 colaptes altirostris Leotaud, we have examined all the specimens of 

 Dendroplex piciis in the M. C. Z., and have come to the conclusion 

 that there are five forms, Leotaud's bird being the Trinidad repre- 

 sentative of the species. The material examined includes specimens 

 from Santa Marta (Colombia), Margarita Islantl, Trinidad, Guiana, 

 Upper Amazon, and eastern and southeastern Brazil. 



In general, immature birds of all forms have smaller, more blackish 

 bills than do adults, and old skins which have been preserved in 

 cabinets for a long time are sometimes more rufous in appearance than 

 fresh specimens. These facts should be borne in mind in making 

 comparisons. 



Following is a brief summary of the six forms recognized: — 



1. Dendroplex picus picus (Gmelin). 



Oriolus picus GmeUn, Syst. nat., 1788, X, P- 384 ("Habitat in Gujanae ar- 

 boribus" — based on Daubenton's, PI. enl., 605 Cayenne). 



