76 ENTOMOLOGICAL NEWS. [Feb., 'lO 



ticular beaches on which my observations were made were 

 Ludlams and Seven-mile Beaches. Both consist of a fine, 

 white quartz sand, overlying a floor of dark, maritime marsh 

 mud, patches of which may often be seen exposed on the 

 seaward side at low tide. 



From the standpoint of Cicindelid distribution the beaches 

 show three well-defined zones, which I have designated as (a) 

 the lower strand, (b) the upper strand, and (c) the dune area. 



The lower strand includes all that part between mean high 

 and low tides. It consists of a firm, compact sand with a 

 relatively smooth surface and is, of course, destitute of all 

 vegetation. Of Cincindelas the characteristic species of this 

 zone is C. dorsalis, which during the proper season occurs 

 there in swarms. Much less frequent in C. hirticollis, while 

 on rare occasions I have observed C. marginata. 



The upper strand includes that portion between mean high 

 tide and the outer limit of the grass-covered dunes. It is 

 composed chiefly of loose white sand, which is piled up here 

 and there in small hillocks about the clumps of various halo- 

 phytic plants, the most abundant of which is the sea rocket, 

 Cakile ede lit ula. In this area there are numerous tidal de- 

 pressions and in these the sand is more compact and of a 

 darker hue. In these depressions we have the favorite haunts 

 of C. hirticollis. Individuals of both C. dorsalis and C. 

 repanda may also occur in this zone, but they are not so abund- 

 ant as C. hirticollis. 



The upper strand with Cakile cdentula as the characteristic 

 plant is not equally developed at all points. It is most clearly 

 marked where the beaches as a whole are low, while in places 

 where the dunes are high and approach close to the water's 

 edge the zone is narrow or absent. 



The Dune Area occupies the greater part of the barrier 

 beach, extending landwards to the border of the maritime 

 marsh. It is typically covered with the dune grass, Ammo- 

 phila arcnaria. Within the dune area are numerous more or 

 less extensive depressions which harbor a vegetation resem- 

 bling that of the marshy tracts bordering the maritime marshes. 



Cicindelas are apparently rather scarce in the dune area 

 and are almost entirely limited to the higher, dry portions, 

 where the grass is not particularly thick. The most abund- 



