Vol. XXvi] ENTOMOLOGICAL NEWS 57 



which fell outside the scope of that work. These are here 

 brought together and a description of the nymph of Enallagma 

 ebrium Hagen is included. 



I. A NOTE ON THE EMERGENCE OF GOMPHINES. 

 At the southern border of the Cornell University campus, 

 a small stream known as Cascadilla Creek divides into two 

 branches. After running through a grassy meadow these two 

 branches again unite to form Dwyer's Pond. During the sum- 

 mer the upper third of one branch dries up, making a pond of 

 the remainder of it. The other branch becomes a slow, slug- 

 gish stream. These quiet waters with their beds of soft mud 

 and sand make an ideal home for the Gomphine nymphs which 

 live there in great abundance. How great I did not realize 

 until the morning of May 7, 1913, when the unusual number 

 of birds along the banks attracted my attention as I came into 

 the meadow. When I walked over to look I saw a great many 

 Gomphine exuviae and closer examination showed many glis- 

 tening wings among them. Along the banks of the stream and 

 pond as far as six feet away from the water the ground was 1 

 strewn with them. In a typical region I counted twenty-seven 

 cast skins in a space only two feet square. Not a Gomphud 

 was seen on the wing nor were any observed for several days 

 afterward. The sandpipers, bronzed grackles, red-winged 

 blackbirds, sparrows and probably other birds had enjoyed a 

 sumptuous feast, as this was evidently the one morning of the 

 season which hundreds of Gomphines had chosen for their 

 emergence. 



II. THE NYMPH OF ENALLAGMA EBRIUM HAGEN. NOTES 



AND DESCRIPTION. 



In addition to the dense population of burrowing nymphs 

 in this part of Cascadilla Creek there is another one composed 

 chiefly of damselfly nymphs, which inhabits the waterweeds. 

 One of the most numerous species of this group is Rnulhujma 

 ehrinm Hagen. Some of these nymphs taken into the labora- 

 tory and reared in a cylindrical wire gauze cage (Needham 



