Mr. R. F. Tomes on the genus Kerivoula. 473 



regione auriculari et vitta supra-frontali ccerulescentibus ; alts 

 caudaque niyris ccerulescenti-viridi limbatis : ventre imo cris- 

 soque pallide ochraceis : rostro nigro, pedibus brunneis. 

 Long, tota 3'8, alee 2'5, caudae 1*7. 



Obs. Affinis Callist^ labradoridi, sed crassitie paulo minore, 

 vitta frontali et regione auriculari cseruleis et colore corporis viridi 

 JTiinus caerulescente distinguenda. 



Haviug recently completed a Monograph of the genus Calliste, it is 

 with no ordinary interest that I look upon the present bird, which seems 

 to be a new and hitherto unrecognized member of the group. A close 

 ally of Calliste labradorides of the New Granadian Andes, it doubt- 

 less represents that species in South-eastern Peru and Bolivia, just 

 as Calliste xanthocephala replaces Calliste venusta in the same lo- 

 cality. The single specimen sent by M. Yerreaux is not in very per- 

 fect plumage ; but its distinctness from its New Granadian repre- 

 sentative is easily seen on comparison. The whole of the fore part of 

 the head of C. labradorides is of a shining green, leaving the nape 

 and back of the neck black. In the present bird there is merely a 

 narrow post-frontal band, which, like the ear-coverts, is deeplv 

 tinged with blue. The black chin of C. labradorides appears to be 

 absent in the present bird ; and the under surface is not tinged with 

 blue. In C. labradorides the small coverts on the bend of the wing are 

 of a bright shining blue, which is also absent in this new species. 



A Monograph of the Genus Kerivoula. 

 By Robert F. Tomes. 



The following monograph is one of a series which I have prepared, 

 having for their object the definition of groups or genera rather than 

 the description of the species of which they are composed. This has 

 been done with a view to render less difficult the determination of 

 the species, which difficulty is chiefly felt from the indiscriminate 

 manner in which they are thrown together by some zoologists ; the 

 descriptions of the species themselves being often quite sufficient, 

 supposing that they had been more carefully divided into groups. 



Two principal works which demand study in working out the spe- 

 cies of Vesper tilionidce — Temminck's jNIonograph, and Wagner's 

 Supplement to the work of Schreber — are of this description. 

 Whilst giving a pretty complete account of each species, the generic 

 definition is, in consequence of the great disparity in the characters 

 of the different species, necessarily so vague as to be nearly useless. 



Scarcely more valuable to the investigator are lists of genera and 

 species without accompanying descriptions, or having these so ex- 

 cessively brief as to be wholly unavailable in distinguishing species. 



I have therefore, while bringing together species which fall easily 

 under a generic definition, considered it advisable to add also a de- 

 scription of each, although they may have been before described, or 

 be even well-known species. 



By adopting this method I am enabled to give much more com- 

 plete descriptions than have hitherto appeared, because they are of 



