340 NEW BIRDS FROM COSTA RICA CHERRIE. 



ceediiig feather. From descriptious I find the lij^ht patch at the base 

 of the quills is preseut iu perlata aud guttata. lu the uew genus the 

 nostrils oi^en iu a narrow slit at the posterior part of the nasal fosste, 

 while iu the species of Margarornis before uie the nasal opening is at 

 the forward end of the nasal fossae. 



Vireo superciliaris, sp. nov. (Rid^way MS). 



(Type No. 9182o, U. S. National Museum, Birris, Costa Eica, 1882, 

 J.Cooper:) Similar to T'.crtrwio/?', but darker olive-green above; below, 

 paler, more inclined to sulphur-yellow with less olive shading on the 

 breast and sides, while the under tail coverts are almost primrose-yel- 

 low ; the lores are black, the cheeks and ear coverts olive-brownish, the 

 latter fading gradually into the olive-greenish of the back. The white 

 spot below the eye, including the white of the lower eyelid (central i)art 

 only, not the entire eyelid), seems to be better defined. In addition to 

 the differences noted above it is considerably larger, measuring: wing, 

 2,G8; tail, 2.30; exposed culmeu, 0.43; nostril to tip of bill, 0.30 ; while 

 true carmioli measures, wing, 2.47-2.50; tail, 2.14-2.20; exposed cul- 

 meu, 0.38-0.41; nostril to tip of bill, 0.25-0.28. 



The present bird comes from the southwest coast region, while the 

 two examples of V. carmioli examined came from the high interior of the 

 country. Nothing is knqwn of the habits of either of the birds. That 

 the bird in hand is separable from typical carmioli can not be doubted, 

 yet the relationship must be very close while a good series of specimens 

 might show them to be inseparable as species. In the mean time it 

 seems to me Vireo carmioli siiperciliaris would better indicate the rela- 

 tionship of the two birds. 



Basileuterus delattrii. 



I have eighteen Costa Rica specimens and five others from Guate- 

 mala, Yeragua, Panama, and Bogota, that compared with Mr. Sharp's 

 description of the type of mesochrysus (Cat. B. Brit. Mus. x, pp. 390-397) 

 eeem in a slight way to differ from that type. Mr. Shari)e writes : "A 

 line of black across the forehead extending to the eye ; upper and under 

 edge of the eyelid white; lores and anterior and posterior edge of the 

 eyelid, extending a little behind. the eye, black; ear coverts, chestnut; 

 behind the ear-coverts a white spot mixed with chestnut." In each of 

 the eighteen Costa Rican examples and the ones from Bogota and Ver- 

 agua this black line "across the forehead" is present, sometimes, how- 

 ever, only faintly (separated from the black lores by the white super- 

 ciliary stripe that extends from the nostrils to the nape), averaging 

 one-tenth of an inch wide, in no instance "extending to the eye." In 

 the Guatemalan example it is entirely wanting, while in the two from 

 Panama there are only a few dusky feathers at the extreme forehead. 

 Costa Rica specimens, the ones from Guatemala, Bogota, and Yeragua, 

 and the two from Panama, all have the "under edge of the eyelid 



