JOURNAL OF ENTOMOLOGY AND ZOOLOGY 109 



swampy woods supporting a Cauadian faima and flora. In 

 Pulton county, N. Y., I have taken the form in the gorge of the 

 Cayudutta creek at Johnstown on June 15, '09, which is the 

 earliest date for the county. At Mountain Lake bog-pond both 

 sexes were found in abundance on June 26, '09. At Vanden- 

 burg's pond on June 19, 1911, I found the insect in numbers 

 and a living female placed in a vial with a male Phalacrocera 

 tipulina was taken in copulation at once and remained ' ' in coitu ' ' 

 for several hours. The last specimens for the year in this county 

 were found at Sacandaga Park on June 27, 1911. As we 

 approach the southern limit of their range they probably emerge 

 in late Ajoril or early May. (Hazletou, Pa., June 8, '10 ; Wooster, 

 Ohio, May 31, '12; Black Mountains, Buncombe county, N. C, 

 May 23, '12). The adult insects are sluggish and do not fly 

 readily and they maj' be swept from the vegetation that sur- 

 rounds their haunts. They frequent the rank growth around 

 small shaded ponds where they occur with numerous other 

 crane-flies of the Canadian fauna. At Ithaca, this form is most 

 common in the gorges and on the moist shaded hillsides to 

 which little sunlight penetrates. 



I am indebted to the following persons for the data on the 

 geographical distribution of the adult flies : Mr. C. W. Johnson, 

 Mr. M. C. VanDuzee, Miss C. J. Stanwood, Dr. W. G. Dietz, and 

 Mr. J. H. Houser. And to Dr. Needham and Miss Tuttle for 

 kind heljj in the securing of the immature stages. 



This work has been done in the Limnological Laboratory of 

 Cornell University under the direction of Dr. Needham, to whom 

 my thanks are due for kind suggestions concerning many points. 



A Key to the Known Labv^e of the Cylindeotomini 



1. Body appendages long, filiform; aquatic or nearly so on 



Fontinalis antipyretica, Hypnum elodes, H. exanmilatum, 



Ramiiiculus fluitans, etc. 

 (Palearctic) Phalacrocera replicata L. 



Body appendages shorter, leaf-like. 2 



2. Dorsal appendages all simple; terrestrial on Viola biflora 



v., Stellaria nemoralis, Anemone nemorosa, etc. 

 (Palearctic) Cylindrotoma distinctissima Meig. 



Some of the dorsal appendages bearing teeth on the anterior 



convex side. 3 



