Mr. 0. Salvin on the Genus Geothlypis. 149 



the nape ; a broad black band passes over the forehead and em- 

 braces the entire orbit as well as the ear-coverts ; the flanks are 

 olivaceous. 



From this comparison it will be seen that this new race does 

 not belong to that found in Costa Rica. It bears a closer rela- 

 tionship to the two races found in South America, of which G. 

 cequinoctialis comes nearest in point of locality, but not of affin- 

 ity. From this it differs not only in the greater bi'eadth of the 

 frontal band, but also in having the olive-colour of the back sepa- 

 rated from the orbit by the downward extension of the slate- 

 colour of the occiput. In this latter respect it resembles G. velata, 

 but has the frontal band considerably broader than in that race. 

 Though I describe these features from a single specimen, I have 

 abundant means of judging of the stability of the distinctions as- 

 signed to the allied races, and hence infer that additional ex- 

 amples will prove that the Chiriqui bird will carry equally stable 

 characters. 



The following Table will give some idea how the different forms 

 of this genus stand related to each other, the divisions being in- 

 tended to show the degree of affinity they bear to one another. 



A. gula flava. 



a. pileo siimmo albo. 



a', abdomine albicante 1. trichas. 



b'. abdomine flavo 2. melanops *. 



h. pileo summo nigxc. 



c'. rostro nigro, abdomine ochrascente . . .3. speciosa. 



d'. rostro inf. llavicante, abd. Isete flavo . . 4. semiplava. 

 c. pileo summo cinerascente. 



e'. regione parotica anteriore nigra 5. ^quinoctialis. 



a", regione postoculari olivacea .... a. cequinoctialis. 

 h". regione postoculari cinerea. 



a"', fronte late nigra /3. chiriqtiensis. 



b'". fronte anguste nigra y. velata. 



f. regione parotica omnino cinerea. .... 6. poliocephai.a. 



B. gula cinerea. 



g'. ciliis uigris 7. Philadelphia. 



h'. ciliis albis 8. MAcaiLLrvRAYi. 



* A female of tbis species has recently come into our possession. It 

 may easily be distinguished from the corresponding sex of G. trichas by 

 the following characters. Like the male it is larger and the feet and legs 



