456 bulletin: museum of comparative zoology. 



Thus there is the well-known Onychodaclylus japonicus from Japan; 

 0. fischeri (Boulenger) based on two adults from the Ussuri district 

 in Siberia; and a third, 0. russicus Nikolsky, from the same region 

 based on young specimens. Most of the differential characters which 

 separate this third form are characters of young salamanders in 

 general. In particular the claws which Nikolsky supposed to ally 

 it with 0. japonicus, are according to Thompson present in young 

 0. fischeri. There is therefore a strong probability that Onycho- 

 dactylus russicus Nikolsky is the young of 0. fischeri (Boulenger). 



35. Batrachyperus sinensis (Sauvage). 

 China: Szechuan, Liang-hoko, (12,000 ft.) 2,848. 



36. Ranodon sibiricus Kessler. 

 Russia: Kopal, 1,964. 



37. Rangoon olympicus Gaige. 



Washington: Lake Cushman, 4,103 (paratype); Olympic Mountains, Mt. 

 Rose, 4,272; 4,273. 



38. Ambystoma opagum (Gravenhorst). 



N. H., 958.— Mass., 4,352; ArUngton, 2,295; Berlin, 960; Lynn, 1,690; 

 1,947; 2,443; Lynn Woods, 3,700; Salem, 1,416 {larva); Sudbury, 

 2,289; Waltham, 957.— N. Y., 220.— N. J.: Paterson, 2,.395.— Ind.: 

 New Albany, 2,074.— Mo.: New Madrid County, 3,143.— Ga., 157.— 

 Ala.: Maplesville, 4,551. — La.: 25 miles N. of New Orleans, 1,633. — 

 Texas, 202. 



The larvae of the species of Ambystoma are much more difficult to 

 determine than those of Eurycea (Spelerpes). However, I have iden- 

 tified by the use of certain undoubted specimens of larval A. opacum, 

 A. maculatum, and A. tigrinum, the various larvae in the collection. 

 The criteria used may be of interest, and in so far as they are found to 

 be constant the records of larvae can be accepted. 

 A. opacum. The appressed legs scarcely meet. Stouter. Belly 



pigmented. Less definite demarcation between the color of back 



and belly. Light dots on side. Head large. 

 A. tigrinmn. The legs scarcely meet, the belly is not pigmented. A 



line of light dots at demarcation between back and belly. Head 



large. 



