1914.] NATURAL SCIENCES OF PHILADELPHIA. o7& 



NEW OR LITTLE-KNOWN CRANEFLIES FROM THE UNITED STATES AND 

 CANADA. TIFULID5;, DIPTERA. 



BY CHARLES P. ALEXANDER. 



During the past few years the various collections of cranefiies in 

 the Eastern United States have been examined by the author ' and 

 observations made upon the more uncommon and less-known species.. 

 The following paper deals with the new species discovered, the 

 corrections in synonomy and the geographical distribution of insuf- 

 ficiently known forms. The collections examined are those of the 

 United States National Museum through the kindness of Mr. Knab,. 

 The Academy of Natural Sciences of Philadelphia through Mr. 

 Cresson, the Museum of Comparative Zoology at Cambridge through 

 Mr. Henshaw, the Boston Society of Natural History through Mr. 

 Johnson and the private collections of Dr. W. G. Dietz, Mr. C. W. 

 Johnson, and Mr. M. C. Van Duzee. 



The Loew and Osten Sacken types are in the Museum of Com- 

 parative Zoology (excepting Triogma exculpta Osten Sacken, which 

 is in The Academy of Natural Sciences of Philadelphia). Coquillett's 

 types and the Limnobinse described by Doane in his first paper are in 

 the National Museum. The species described by Mr. Johnson are in 

 The Academy of Natural Sciences of Philadelphia, the Boston Society 

 of Natural History or in the private collection of the describer. 



Family TIPULID^. 



Subfamily LIMNOBIN.E. 



Tribe Limnobini. 



Genus DICRANOMYIA Stephens. 



1829. Dicranomyia Stephens; Cat. Brit. Ins., vol. 2, p. 243. 

 Dicranomyia nelliana sp. n. 



Color gray; wings with vein S>c short; membrane hyaline with 

 abundant brown spots and dots. 



Male, length, 5.5 mm.; wing, 7.5 mm. 



Rostrum, palpi and antennae dark brown, the segments of the 

 antennal flagellum rounded oval. Head gray. 



Thoracic dorsum gray, the prsescutum with a large dark brown 

 spot in front whose exact limits behind are uncertain, due to the 



