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On some tree-frogs allied to Hyla caerulea 
with remarks on noteworthy secondary sexual 
characters in the family Hylidae. 
By 
G. A. Boulenger, F. R. S., Ph. D. (Gießen), in London. 
In their great work '), Dum£rız and Bıerox have confounded, 
under the name of Hyla cyanea Dauvın, two perfectly distinet species. 
The first, which by right of priority should bear the name of 
H. caerules WHITE (the later eyanea Dau»., being a strict synonym), 
has been excellently described and figured by GÜNTHER ?) as Pelodryas 
caeruleus, from Australian specimens; it has a wide distribution in 
Australia, and oceurs also in New Guinea. The second, figured and 
recorded from Amboina and New Guinea by SCHLEGEL?), and which 
occurs also in other islands to the west of New Guinea and in 
Queensland, was well characterized by Core) under the name of 
Calamita dolichopsis. 
The distinction drawn by ÜopE was upheld by me when revising 
the British Museum collection?) and the names H. caerulea and 
H. dolichopsis have been accepted by subsequent writers. A third 
supposed species, MH. infrafrenata GTur.°), I reluetantly admitted in 
the system for lack of sufficient material, but I am now absolutely 
convinced that it is based on a young H. dolichopsis, as suggested by 
1) Erpetologie Generale, Vol. 8, p. 577 (1841). 
2) Catalogue of the Batrachia Salientia, p. 119, pl. 9, fig. B (1858), 
3) Abbildungen neuer oder unvollständig bekannter Amphibien, p. 26, 
pl. 9, fig. 2 (1837). 
4) Journ. Acad. Philad. (2), Vol. 6, p. 204 (Sept. 1867). 
5) Catalogue of the Batrachia Salientia s. Ecaudata (1882). 
6) Ann. Mag. Nat. Hist. (3), Vol. 20, p. 56 (June 1867). 
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