144 U. S. NATIONAL MUSEUM BULLETIN 2 06 



Dimensions. — Head and body 22.5 mm.; head length 7 mm., 

 width 6 mm. ; femur 9 mm. ; tibia 1 1 mm. ; foot 8.5 mm. ; hand 5.5 mm. 



Color in alcohol. — Center of dorsal region pale wood brown, Hghten- 

 ing on Hmbs; a pale sepia crossbar between the eyes, intersected by a 

 faint median dorsal stripe which in this specimen becomes almost 

 invisible on the body; a wide drab lateral stripe, its upper and lower 

 borders emphasized with an indistinct sepia line; a narrow dark line 

 along can thus rostralis; a faint powdering of dark dots on upper femur 

 and tibia, tending to form indistinct crossbands on the tibia; ventral 

 surface immaculate olive-buff; upper lip white. 



Variations. — The other specimen taken at Lassance with the 

 described specimen is a male also, and is practically identical with it 

 except that it is 1 mm. longer and has a slightly wider head, while 

 the crossbar between the eyes is lacking. 



Four paratypes of H. parkeri, now USNM 84359-60 and USNM 

 101440-1, agree entirely with the Lassance specimens in every essen- 

 tial. A male, 84360, has the adpressed hind leg reaching only to 

 posterior border of eye; the others have it reaching to center or 

 anterior border. The largest specimen, a female, 84359, has a total 

 length of 26 mm. Two specimens show a distinct cruciform mark on 

 top of the head, where the interorbital bar intersects the median dark 

 line, here thickened and relatively prominent. The others scarcely 

 show an indication of an interorbital bar, and the median dark line 

 is greatly reduced or almost invisible. The wide, dark, lateral stripes 

 are constantl}'" present in all examples. The variation seems to be 

 very slight even from two widely separated localities, and it appears 

 that parkeri is one of the more stable species. 



Remarks. — A series of young frogs of this species was taken on 

 low plants growing near a ditch beside a road at Pirapora, about 50 

 miles north of Lassance. The smallest of these measured 12 mm., 

 but already the tail was completely absorbed. The recent change 

 from tadpole to frog is attested in all these examples by the presence 

 of the dark elongate patch showing through the skin on either side 

 of the sacrum. The coloration at this stage is just the same as in the 

 adult forms at hand, except for the fact that the lateral stripes are 

 not quite so dark. 



The relationship of this species to the interesting H. squalirostris 

 has been discussed under the latter species. It may be that other 

 allies of the very confused rubra group can be separated off as species 

 with fairly definite geographical boundaries when more collecting has 

 been consistently done over critical territory in northern Brazil and 

 the Guianas. 



