Vol. XXri] EWTOIfOUXUCAL NEWS 57 



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

 brought together and a description of the n3rniph oi EmaUagma 

 ebrium Hagcn it indndcd. 



L A Non ON THE EMEKCeNCE OP GOMPIIINES. 



At the touthem border of the Cornell University campus, 

 a small stream known as Cascadilla Creek divides into two 

 branches. After nmning through a grassy meadow these two 

 l)ranchcs again unite to form Dwyer's Pond. During the sum> 

 incr the upper third of one branch dries up. making a pond of 

 the renuiniler of it. The other branch become s a slow, slug^ 

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

 and sand make an ideal home for the Gomphine nvmphs which 

 live there in great abundance, llow great I did not realise 

 until the morning of Nfay 7. 1913. when the imuaaal number 

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

 the meadow. When I walked over to look I taw a great BMUiy 

 Oomphine exuviae and closer examination showed many ^i*- 

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

 pond as far as six feet away from the water the ground wai 

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

 cast skins in a space only two feet tquare. Not a Complmi 

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

 afterward. The sandpipers, bronsed 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 

 cmergfTU'e. 



II. I iir. XVMPII op En*Aii.a<.ma KitHii M HaGEN. NoRt 

 AND DeSCKIPTION. 



In addition to the dense population of burrowing nymphs 

 in this part of Cascadilla Credc there is another one composed 

 chiefly of damselfly nympht, which inhabits the waterweeds. 

 One of the nK>st numerous species of this group is EmaUagma 

 ebrium Hagcn. Some of these nymphs taken into the labora- 

 tory and reared in a cylindrical wire gauze cage (Needham 



