40 bulletin: museum of comparative zoology. 



Lafresnaye's type certainly represents the southern form, with the 

 blue of a much more purplish shade than in any example from Colima. 

 It is not quite so dark as Nelson's type, which is an extreme example, 

 but compared with a series of topotypes it is an average specimen. 

 The specimen was mounted and on exhibition, in direct light, in the 

 Boston Society of Natural History for more than fifty years ; it shows, 

 however, but slight injury; the blue is perhaps a little dulled and the 

 black has become somewhat brownish. 



It is now obvious that C. s. pulchra Nelson is a synonym of C. s. 

 sanhlasiana (Laf resnaye) . The northern form being without a name, 

 we take pleasure in naming it in honor of Dr. Nelson. 



CissiLOPHA sanblasiana nelsoni, subsp. nov. 



Tyye — M. C. Z. 65,111. Adult d". Mexico:' Colima. 21 March, 

 1913. Gustav. Gliickert. 



Characters. — Similar to C. s. sanhlasiana (Lafresnaye) of Acapulco, 

 but smaller; upper parts bright cerulean blue instead of rich ultra- 

 marine or cyanine blue; under tail coverts and thighs dull ultra- 

 marine blue instead of cyanine blue. 



Measurements. — Type, adult cf; wing, 143.5; tail, 155; tarsus, 39;. 

 exposed culmen, 31. 



