TO ENTOMOLOGICAL NEWS [Jan., '15 



2 T. dives Johannsen, i Cricotopus trifasciatus Panzer, i Ch. 

 fulviventris Johannsen, 5 Ch. riparius Meigen, i Ch. sp. 81 

 Johannsen, i Ch. sp. 83 Johannsen, i Orthocladius ftigax Jo- 

 hannsen. 



Nine belong to the genus Chironomus, three to Tanytarsus 

 and one to Orthocladius. The genus of the remaining num- 

 ber could not be determined. 



The only other Diptera were one mosquito larva (Anopheles 

 maculipennis) and one unnamed larva. 



CoLEOPTERA were represented only by two Dytiscid beetles 

 and these eaten in the summer months, June and July. 



Odonata. — A damsel-fly is a delectable bit for a dragonfly 

 and two nymphs of the same size in either group cannot safely 

 be left together unless they are about to transform, when they 

 do not eat. All of those recorded were damsel-flies except 

 one Libellulid and one Ophiogomphus. The only damsel-fly 

 which could be determined was Enallagma hageni. 



Crustacea. — From the middle of March onward, Crustacea 

 are an important item in the food of all families of dragonflies. 

 Considering the abundance of Amphipods in Cascadilla Pond, 

 it is surprising that they are not even more generally used 

 than the records indicate. In the collections made, Amphi- 

 poda are represented by five Hyalella; Cladocera by two 

 Diaptamus and four Cyclops; Ostracoda by two Cypris and 

 one specimen whose genus was not determined. 



Hydrachnida. — Plathemis and Sympetrum had each eaten 

 the almost uninjured larva of a mite, and Calopteryx had de- 

 voured two water bears (Macrobiotus), which had remained 

 in almost perfect condition. 



A Physa had been recently eaten by an Anax and had re- 

 mained only partly digested. 



From this detailed study it is evident that the nymphs of 

 Odonata are strictly carnivorous, all families feeding vorac- 

 iously throughout the year upon Chironomid larvae, mayflies 

 and the young of their own order. In the warmer months they 

 eat Crustacea and Hemiptera, at which time these are avail- 

 able, not refusing any other forms which chance to pass within 

 reach of their powerful labium. 



