The Crane-Flies of New York — Part I 927 



Genus Phaiacrocera Schincr 



1863 Phaiacrocera Schin. Wien. Ent. Monatschr., vol. 7, p. 224. 



The small genus Phaiacrocera includes but three described species — 

 two North American and one European. They are of especial interest 

 because of certain venat'onal features which they possess and which aid 

 materially in explaining the remarkable venation of the more specialized 

 species of Cylindrotominae (p. 863). The larva is aquatic, living on 

 submerged plants. It is greenish brown in color, and the body is pro- 

 vided with numerous long, flexib e filaments which are quite unlike the 

 spiny armature of the more specialized members of the subfamily. 

 The species are northern in their distribution and are most frequently 

 found in bogs and boggy meadows. The local species may be separated 

 by the following key : 



Vein Ri present and persistent to the wing margin; wings dark brown. [Proc. Acad. 



Nat. Sci. Phila., p. 603-605, pi. 25, fig. 10. 1914.] (Plate XXX, 9.) . . . P. neozena Alex. 

 Vein Ri lost by atrophy; wings grayish brown. [Proc. Ent. Soc. Phila., vol. 4, p. 241. 



1865.] (Plate XXX, 8.) P. tipulina O. S. 



Genus Cylindrotoma Macquart 



1834 Cylindrotoma Macq. Suit, a Buff., vol. 1, Hist. Xat. Ins., Dipt., p. 107. 



The genus Cylindrotoma forms a small group of crane-flies, including 

 two European and three North American species. They are all similar 

 in color, being usually bright yellow with black stripes on the thorax, 

 in this respect suggesting some species of Nephrotoma. The larvae live 

 on the lower side of the leaves of various monocotyledonous and dicoty- 

 ledonous plants such as Allium, Anemone, Trautvetteria, Stellaria, and 

 Viola, the insect feeding on the leaf tissue. The larvae are green in 

 color and are usually provided with fleshy points and processes. 



The following key divides the local species of Cylindrotoma: 



Tarsi dark brown. [Proc. Ent. Soc. Phila., vol. 4, p. 236. 1865.] (Plate XXX, 6.) 



C. americana O. S. 



Tarsi yellow. [C. iarsalis Johns., Psyche, vol. 19, p. 2, fig. 4, 1912. C. anomala Johns., 



Psyche, vol. 19, p. 2-3, fig. 3, 1912.] (Plate XXX, 7.) C. tarscUs Johns. 



Genus Liogma Osten Sacken 



1869 Ldogma O. S. Mon. Dipt. N. Amer., part 4, p. 298. 



In the genus Liogma there are three described species, all occurring 

 in the North Temperate Zone. The coloration of the adult flies is 



