1898.] NATURAL SCIENCES OF PHILADELPHIA. 247 



•dirty buff, or yellow, variously marked. Very rarely the two 

 curved black stripes on the mantle are wanting, and occasional 

 specimens fail to show the pale dorsal line, which in others is very 

 •conspicuous. We fail, however, to find internal characters permit- 

 ting the division of our series into several species ; and while it is 

 possible that some of the named forms may be geographic subspecies, 

 we are disposed to regard them rather as local variations of but 

 slight rank and uncertain diagnosis. Large series from many local- 

 ities must be collected and compared to define the subspecies, if any 

 exist. 



It differs chiefly from P. foliolatum in being smaller, with very 

 much shorter " amputateable " tail segment, and in dentition. 



Simroth found a very long, smooth, vermiform spermatophore in 

 P. AndersonL 



Santa Clara Co. (Ehrhorn, Raymond) around San Francisco Bay 

 (Cooper, Button, et at 7 .), California ; Portland (Malone), Forest 

 Grove and Astoria (Hemphill), Oregon ; Kalama, Chehalis, Port 

 Townsend and San Juan Island (Hemphill), "Washington ; Van- 

 couver Island ( Wickham, Taylor); Old Mission, Lake Cceur d'Alene, 

 Idaho (Hemphill). 



There is considerable variation in the shape and size of the epi- 

 phallus, even among specimens of similar size and external appear- 

 ance, collected at the same time at one locality. Thus, in one spec- 

 imen of a small series from San Juan Island, the epiphallus is 4£ 

 mm. long, and straight (fig. 61) ; while in another it measures 7 mm. 

 and is curved (fig. 59). The extremes in a larger series from Oak- 

 land, Cal., are : shortest, 5 mm. long, straight ; longest 8 mm. long, 

 curved. After vainly trying to correlate the variations of the 

 epiphallus with other characters, with a view to defining two or more 

 species, we are compelled to conclude that they are largely individ- 

 ual, possibly to some extent functional, but that these variations are 

 not in any sense characteristic of races or species. Of course the 

 observations were made upon sexually mature individuals. 17 



Of the several forms included in the above synonymy, it is now 

 generally admitted that P. Hemphilli is a synonym of P. Andersoni. 

 Professor Cockerell 18 has stated his opinion that P.flavum, described 



17 Mr. Cockerell's division of Prophysaon into forms with the epiphallus 

 '' sausage-shaped " and those with it " banana-shaped ' ' is therefore not a spe- 

 cific criterion according to our observations. 



18 Nautilus, XI, p. 77, Nov., 1897. 



