38 bulletin: museum of comparative zoology. 



Lafresnaye's two cotypes do not belong to the species with which 

 his name albitempora has always been associated, but are perfectly 

 characteristic examples of the Mexican ophthalmicus of Du Bus, and 

 probably came from southeastern Mexico. In many instances 

 Lafresnaye did not know whether his specimens were from Colombia 

 or Mexico, and we find numerous labels written by him which say, 

 "Colombie ou Mexique." At some date later than his description of 

 Tachyphonus albitempora, Lafresnaye himself thought his bird identi- 

 cal with Arremon ophthalmicus and wrote a second label for his speci- 

 mens to that effect. 



Chapman (Bull. Amer. mus. nat. hist., 1917, 36, p. 618) while work- 

 ing on the Colombian forms of Chlorospingus, appears to have been 

 the first ornithologist of the present generation to detect the absolute 

 discrepancy between Lafresnaye's description and the Colombian 

 bird to which the name had universally been applied. He therefore 

 named the Colombian form Chlorospingus albitempora nigriceps. 



We suppose the type of Chlorospingus flaviventris Sclater is in the 

 Museum of Cambridge LTniversity; it should be examined and com- 

 pared because if, as supposed by Salvin, it represents what was known 

 as C. albitempora Lafr., it bears the earliest date of any of the sub- 

 species. Trinidad, whence it was supposed to come, is undoubtedly 

 an error, and the subspecies to which it belongs must be proved before 

 a new arrangement of the forms of this species can be made. 



Cnemoscopus, gen. nov. 



Type. — Arremon rubrirostris Lafresnaye. 



Characters. — Similar to Hemispingus in form and in shape of bill; 

 legs much shorter - — wing four and one quarter times the length of 

 the tarsus (three and one half times in Hemispingus); coloration 

 decidedly different from any of the species in the genus Hemispingus, 

 the red bill, gray head, and yellowish green body being very distinc- 

 tive. Except for the more slender, red bill, the general appearance 

 suggests the genus Eucometis. 



OsTiNOPS decumanus insularis Dalmas. 



In 1900 (Mem. Soc. zool. France, 13, p. 137) Count Dalmas named 

 the Great yellow-tail of Tobago, basing his separation upon the smaller 

 size and paler castaneous rmnp of the island form. In 1906, Hell- 



