1913.] NATURAL SCIENCES OF PHILADELPHIA. 63 



Fundulus heteroclitus macrolepidotus (Walbaum). 



Chincoteague, Assateague, Wallops. 

 Fundulus luciae (Baird). 



Found only in the fresh regions of still waters, such as are continuous 

 with brackish waters, on Chincoteague. 



Lucania parva (Baird). 



A few found on Assateague and Chincoteague. The former were 

 in high color. 



Cyprinodon variegatus Lac^pede. 



Abundant and in high color on Chincoteague and Assateague 

 Islands. 



Tylosurus marinas (Walbaum). 



One at Franklin City. 

 Menidia beryllina (Cope). 



A few found on Assateague. 

 Menidia menidia notata (Mitchill). 



Common at Assateague and Wallops. 



Mugil curema Valenciennes. 



Young found in brackish pools and ditches on Assateague. 



Gasterosteus aculeatus Linnaus. 



First found on Assateague in a large open glade, filled with duck- 

 weed for several miles in extent. These little fish were found swarm- 

 ing in myriads, and were uniformly about an inch in length. 

 Some had their ventral membranes bright crimson, and many 

 were slightly variable otherwise in color, though most were 

 more or less brassy or golden. All which we secured were 

 of the mailed type. Associated were a few silversides, killifish, 

 rain-water fish, and pursy minnows. The sticklebacks often swim 

 in immense schools and take refuge in the duck grass when disturbed. 

 They are much condemned by persons living on the island who 

 raise ducks, as they are said to cause the death of the young birds 

 in some numbers at times. One man told me he had lost thirty- 

 two young ducks one season, due to the birds swallowing small 

 sticklebacks. Many other complaints were also heard. It seems 

 that in the summer or during drought the small fishes congregate 

 in shallow puddles and being then easily captured they are eagerly 

 devoured by the young ducks. The fish, finding itself a captive, 

 immediately assumes its only defense by locking tighth^ its 



