Dr. P. L. Sclater on a new Species 0/ Tetragonops. 371 



XXX. — On a new Species of Tetragonops. By P. L. Sclater, 

 M.A., Ph. D., F.R.S., &c. (Plate X.) 



Through the kindness of Prof. Baird, of the Smithsonian In- 

 stitution, Washington, I am enabled to devote the final plate of 

 this series of ' The Ibis ' to the illustration of one of the most 

 interesting novelties that I have met with since I commenced 

 my editorial duties. In former volumes of this Journal I have 

 written upon the American Barbets*, and given a figure of the 

 anomalous form Tetragonops ramphastinus, which connects this 

 group with the Toucans. I have now the pleasure of making 

 known to my readers the existence of a second species of the 

 same genus, which has been lately discovered by Dr. A. von 

 Frantzius in the mountains of Costa Rica, and which Prof. Baird 

 proposes to call, after its discoverer, 



Tetragonops frantzii, sp. nov. (PI. X.) 



Olivaceus : macula nuchali elongata nitente nigra : capite un- 

 dique cum cervice, pectore et ventre medio flavido-fulves- 

 centibus : semitorque pectorali utrinque cinereo, medialiter 

 fere obsoleto : ventre imo crissoque olivaceis, medialiter fla- 

 vicantibus : rostro plumbeo, apice pallido : pedibus nigris. 

 Long, tota 7*4 poll., alse 3'4, caudae 2*3, rostri a rictu 0'8, 

 tarsi rO. 



Hab. in int. reipubl. Costa Rica. 

 Mus. Smithsoniano. 



The new species of Tetragonops is of considerably smaller size 

 than the type species, Tetragonops ramphastinus, and so difi'erent 

 in colouring that there is no possibility of their being con- 

 founded together. In general characters it is not so strongly 

 marked, and is to some extent intermediate between Capito and 

 Tetragonops, although certainly to be placed in the latter genus. 

 The bill is relatively as short as in T. ramphastinus ; the keel 

 between the nostrils is much elevated, and brought to a sharper 

 edge than in the latter, but outside the nostrils is bevelled ofi" at 

 once, instead of being extended into a broad flattened surface. 

 The curious bifurcation of the extremity of the lower mandible 

 exists likewise in the new species. 



The wings are short, reaching to about one-third of the dis- 

 * See 'Ibis,' 1861, p. 182, and 1862, p. 1. 



