

128 Thr Ottawa Naturalist. [October 



may make systematic collections and studies of these insects, so 

 .numerous both as regards species and individuals. The minute 

 and delicate forms of which the order of flies is largely composed, 

 as well as many of the larger forms which have long fragile legs, 

 require special care and skill in collecting and preserving. F^or 

 these reasons a list such as the following is by no means typical 

 of the fauna, as whole groups of the most common species may be 

 entirely lacking. 



I have tried to group the species in agreement with the classi- 

 fication published by Dr. Williston, so as to indicate the families 

 represented. 



When sending my flies for determination I requested Dr. 

 Howard to retain for the U. S. National Museum's unrivalled 

 collections any specimens which might prove to be of special 

 value, and I was gratified to find that about fifty were deemed to 

 be worthy of retention. The remark " U. S. Nat. Mus." after 

 any species denotes that its representative Is to be found there. 



Cecidomyid.^. 



Cecido.myia, sp. Very common on willows. 



Diplosis pini-inops, O.S. Bred from puparia upon pinc-twigfs. 



Diplosis, sp. One specimen, 



MVCETOPHILID.^. 



Sciophila, n. sp. ? U. S. Nat. Mus. 



CULICID.B. 



Culex impig-er, Walk. A very abundant and obtru.sive pest. 



Chironomid-^. 

 Chironomus cristatus, Fabr. Common early in May. 



TlPULID.^. 



Limnophila macrocera, Say. One specimen. 



Limnophila rufibasis, O.S. One specimen. 



Tipula angustipennis, Loew. A very common species. 



Pachj'rrhina lug-ens, Loew. Also common. 



Amalopis inconstans, O.S. One specimen. 



Ctenophora, n. sp. ? U. S. Nat. Mus. 



Ctenophora, n. sp. ? U. S. Nat. Mus. 



Rhyphid^. 



Rhyphus alternatus, Say. One taken 28th June. 

 Rhyphus punctatus, Fabr. Two specimens. 



