140 PROCEEDINGS OF THE ACADEMY OP 



Three specimens (623) in Mus. Compar. Zoology, Cambridge, Mass. From 

 near Rangoon, Burmah. With many other valuable specimens, these were 

 procured by Wm. Theobald, Jr. 



Hylorana subc(erulea Cope, sp. nov. 



Fourth toe somewhat more than half the length of the head and body. 

 Two lateral glandular folds, the inferior much narrower, not reaching groin 

 from angle mouth. No groove on the side of the belly. General form slen- 

 der, the head elongate, the muzzle produced, 1-5 length of eye fissure, the 

 nostril measuring two-fifths this distance. Tympanum -06 the diameter of 

 eye. Interorbital width equal from eye to nostril. The middle of the meta- 

 carpus measures the end of the muzzle, as does the proximal two-fifths the 

 tarsus. Skin above smooth except on posterior iliac region, where are small 

 warts. Sides scarcely glandular. A delicate fold on tarsus ; one metatarsal 

 tubercle. Tongue rhombic, filling space between rami, contracted a little 

 behind. Vomerine teeth in two rather long series originating at the front of 

 the choanae, and extend very obliquely backwards, and well separated. 1'3 

 phalanges of third and fifth toes free, and three phalanges of fourth toe. 



Above glossj^ blue, sides with a blackish-blue band from end muzzle to 

 groin. Dermal folds and a band all around the upper lip brassy yellow. 

 Femora behind speckled and marbled with yellow on a blackish ground, and 

 with a dark longitudinal band below ; upper face tibia golden brown, not 

 cross-barred. Arm not crossed-barred. Everywhere below brown shaded, 

 palest on the belly. In a younger specimen the belly is white and the upper 

 surfaces pale brown. 



Lin. Lin. 



Length head and body .....15-1 Length hind limb 2.8 



" tibia &• " to behind tympanum... 6* 



" tarsus 4-5 Width at same point 4-5 



" foot 8-25 



This very handsome animal is nearest in general characters to the H. m a- 

 crodactyla Giinther, a specimen of which was procured at the same 

 locality, viz.: Rangoon, Burmah, by Wm. Theobald, Jr., above recorded. Its 

 feet are much less palmate than those of the H. chalconota, from Java, 

 which it also resembles. It is one of the best illustrations of a genus which 

 has been particularly furnished among the Batrachia with beauty of hue and 

 lustre. Mus. Compar. Zoology (G24 — 626), three specimens. 



Sexual Law in ACER DASYCARPUM Ehrb. 

 BY THOMAS MEEHAN. 



Noticing among the silver maple trees at Bristol, Pa., some trees which had 

 evidently borne only pistillate flowers for many years, and had subsequently 

 pushed forth branches which bore only male flowers, it occurred to me 

 that possibly extended observations might enable me to discover the law 

 which governed the production of male or female forms respectively. I^f- 

 terwards examined carefully some thousands of trees in blossom, and though 

 I failed in the immediate object, the discovery of the law, it may serve an 

 useful purpose to place on record the facts observed in the investigation. 



The staminate flowers are easily distinguished from the pistillate ones, not 

 only by their larger size, owing to the development of the stamens, but by 

 the pale yellowish-green of the filaments. The awl-shaped styles of the 

 female flowers do not project far beyond the scales, and are reddish-brown. 

 The Bristol trees were about a foot in diameter, very healthy, judging by their 

 clean smooth bark, and had probably been in fruit-bearing condition for at 

 least ten years. The proportion of male to female trees was about equal. 

 There were many instances of branches with male flowers which had perhaps 



[March, 



