174 ANNALS NEW YORK ACADEMY OF SCIENCES 



Measurements 



Tip of snout to vent 1G mm. 



Tip of snout to posterior border of tympanum 5.5 



Greatest breadth of head 6 



Foreleg from axilla 11 



Hind leg from vent 24 



Tibia 8.5 



Notes on Paratypes 



The type is a male, taken singing at night, with the usual pale night 

 coloration. Specimens taken in the daytime (concealed under moss) are 

 very dark in color and exhibit considerable variation in pattern, two 

 having a light median dorsal line. In a specimen taken in an air plant 

 (No. 10291) the dorsal dark area is cinnamon brown and the sides bright 

 pale green, the legs with dark bars; this coloration has been described by 

 Stejneger (190-1, Eept. U. S. Nat. Mus., 1902, p. 586) as a variant color- 

 ation of juvenile E. auriculatus. The darker specimens have narrow light 

 crossbands on the limbs. The granulation of the venter in the female 

 specimens is faint, though still evident. 



This species was found very numerous at Maricao and on El Yunque, 

 singing frequently from trees, at least ten feet from the ground. On 

 El Yunque specimens were collected in air plants, near the peak, and 

 under moss on the rocks of the peak itself. 



The note is a rapid succession of shrill clicks, very insect-like; the 

 chorus sounding not unlike the rapid clicking of a telegraphic instrument. 



Were it not for the minute size of the singers and the extremely dis- 

 tinct note, this species might well be considered the young of E. auricu- 

 latus. I am unable to agree with Stejneger's supposition that its note is 

 made by juvenile males of the latter species. The gonads, at any rate, 

 appear to be those of an adult in the specimens examined, differing in 

 form and pigmentation from those of young E. auriculatus of similar size. 



Eleutherodactylus locustus, new species 



A single specimen from El Yunque, just above the Forester's cabin, 

 collected September 30, 1919. 



Diagnostic Characters 



Size small, snout obtuse, nostril much nearer to the end of the snout 

 than to the eye; tympanum small, indistinct, one-fourth the diameter of 

 the 'eye, separated from the eye by a little more than its diameter; 





