1S90.] Recent Literature. 3^3 



Dr. Sclater in 1SS7, * and Count von Berlepsch in iSSS : t but in each 

 case with only partially satisfactory results, owing in large part to lack of a 

 sufficient number of specimens to show what limit of variation in any one 

 form should be allowed for individual variation. Happily this deficiency, 

 in the case of one species at least ( C viridis), was supplied by material 

 which came into Mr. Allen's hands while the subject was fresh, thus en- 

 abling him to supplement the efforts of his predecessors by a much more 

 elaborate paperj. The additional material which enabled Mr. Allen to 

 obtain the clue to individual variation in species of this genus formed 

 part of the "Smith collection of Brazilian birds, recently purchased by 

 the American Museum of Natural History." and embraced no less than 

 46 specimens of C. viridis. "These specimens, while presenting great 

 variations in respect to coloration, size, and particularly in the size and 

 color of the bill, are obviously referable to a single species, the two ex- 

 tremes of the series being completely connected by intermediate phases." 

 Mr. Allen further observes that "while there is evidently a wide range 

 of individual variation, in coloration as in the size of the bill, much of 

 the very great variation in plumage is unquestionably due to season and 

 age"; but he savs "there is no apparent difference in the sexes, except that 

 the females are found on measurement to average slightly smaller than 

 the males." By the aid of this material and specimens from other sources 

 Mr. Allen was enabled to satisfactorily separate and define C. viridis 

 (Vieill.) from C. ochrocephala Tsch. and properly allocate their syn- 

 onymy, and give satisfactory reasons for considering C. cearensis Baird, 

 C. wiedii Pelz. , C. albiventris Scl. & SalV., and C. altirostris Salv. as mere 

 synonyms of C. viridis (Vieill.). Mr. Allen's critical remarks are not, 

 however, confined to C. viridis and C. ochrocephala, but having in hand 

 "much other authentic material . . . making, with the large series of the 

 American Museum of Natural History, 123 specimens, and representing all 

 the species of the genus except C. atrirostris Scl.," a few observations on 

 other species of the genus are added. These are (i)C flavipectus Scl., 

 which name is restricted to specimens from Colombia; (2) C. flavipectus 

 subjlavcscens (Cab.), from Central America; (3) C. flavipectus trinitalis 

 subsp. nov., from Trinidad; (4) C. Jlaviventris Lafr., from southern Mex- 

 ico, southern Yucatan, and Guatemala; (5) C. Jlaviventris yucatanevsis 

 Ridgw., from northern Yucatan; (6) C. insular is Ridgw., from Cozumel 

 Island; (7) C. guianensis (Gm.), from Guiana and Amazonia. The forms 

 of this genus are thus for the first time treated from the standpoint of mod- 

 ern nomenclature, trinomial designations being applied to those which are 

 found to intergrade with others. The extent to which this reduction of 



* Remarks on the Species of the Genus Cyclorhis. Ibis, fifth series, Vol. V, July 

 1SS7TPP. 320-324, pi. x. 



tOn the Ganus Cyclorhis, Swains. Ibis, fifth series, Vol. VI, Jan. 1888, pp. 83-92. 



I On Cyclorhis viridis (Vieill.) and its Allies, with Remarks on other species of the 

 Genus Cyclorhis. Bull. Am. Mus. Nat. Hist. Vol.11, No. 3, June, 1889, pp. 123-135, 

 figs. 1-7. 



