50 ARKIV FÖR ZOOLOGI. BAND 13. NIO 4. 



Before me I have two specimens of C. 7nexicana ScL. 

 from Nicaragua and Mexico, and one of C. luteola Cab. from 

 Minas Geraés. Compared with those the present two specimens 

 of C. cerioclunis Bångs agree much more with the former 

 species than the latter one, when the characters are not inter- 

 mediate. Back, scapulars, and upper tail-coverts are of a 

 plain colour somewhat between olive-brown and dark olive, 

 much nearer to the colour in mexicana than to that in luteola, 

 which is distinctly sooty black; auricular region sooty as in 

 mexicana but not sooty black as in luteola; the rump is a 

 clearer yellow than in mexicana but less pure than in luteola: 

 målar region, chin, and throat as in rnexicana; rest of under 

 parts intermediate ; under tail-coverts dusky white with 

 grayish concealed bases as in mexicana; white tip on inner 

 web of outermost rectrix about 3,5 mm. in both sexes (in 

 luteola 10, in mexicana 2 — 3,5); white spöt at base of primaries, 

 small as in the present specimens of mexicana, the extent of 

 this spöt varies, however, according to Ridgw^ay in both 

 mexicana and luteola. 



So far as I can judge from the specimens before me, I 

 cannot agree with Messrs. Thayer and Bångs about the near 

 affinity of C. cerioclunis to C. luteola, but find the Pearl Island 

 species being an island form nearest allied to C. mexicana of 

 the main. 



The measurements in the present specimens are as follows: 



S, Viveros I.: wing 52,5; tail 34; exposed culmen 13; 

 tarsus 16. 



2, Viveros I.: wing 54; tail 36; exposed culmen 13; tar- 

 sus 16. 



Fam. Icteridae. 

 88. Megaquiscalus major macrourus (Swainson). 



Megaquiscalus major macrourus Thayer and Bångs, BuU. Mus. Comp. Zoöl. 

 XLVI. 1905. 157 (San Miguel; Saboga). 



BovALLius' Collection: 1 S, 1 $? Saboga, March 30th and 

 31st; 1 (^, Viveros, April 8. 



Thayer and Bångs say, that their series was compared 

 with typical Mexican specimens by Nelson, who found no dif- 

 ferences whatever between the island birds and those from 

 eastern Mexico and Central America generally. 



