388 PROCEEDINGS OF THE NATIONAL MUSEUM. 



Of the total number of species of crane-flies in the following list 85 

 were described by Osten Sacken, 38 by Alexander, 25 by Loew, 15 

 by Say, 12 by Johnson, and the remainder by a number of other 

 entomologists. Of the species that were originally described from 

 District of Columbia material six have not been re-collected here. 

 These species are : 



Tipula fragiUs Loew ; Tipula grata Loew ; Tijmla ignohilis Loew. 



Ormosia holotricha Osten Sacken; Ormosia nigripUa Osten 

 Sacken ; Tricyphona vemalis Osten Sacken. 



Comparisons of the present with other local lists may be noted as 

 follows : 



From New England there have been recorded 240 species; from 

 New York, 272 ; from New Jersey, 165 ; District of Columbia, 201 ; 

 North Carolina, 116 ; and from Florida, 45. In comparing these lists 

 it must be borne in mind that the species of crane-flies are very much 

 more numerous in the northern part of the United States than in 

 the Southern States, which accounts for the small list from Florida 

 and the relatively large one from New York. 



With respect to local distribution of the crane-flies hereafter listed 

 it may be said that 83 species, so far as collected, occur only in the 

 Piedmont Region and 11 in the Coastal Plain.' These figures indi- 

 cate that our crane-fly fauna has much stronger affinities with north- 

 ern and upland than with southern and lowland faunas. Of the 11 

 species collected only in the Coastal Plain three, {Dicranomyia 

 gladiator^ Rhamphidia mainensis, and Limnophila niveitarsis) are 

 northern forms, which, like numerous northern plants, etc., find the 

 most favorable habitat in this region, in the Magnolia bogs of the 

 Coastal Plain.2 One of the craneflies also {Molophilns ')wra-caesrfr/ev- 

 sis) illustrates the relationship of these bogs to the Pine Barrens. 



For those especially interested in the fauna of Plummers Island, 

 Maryland, it may be stated that 91 species of Tipuloidea have been 

 collected on that Island, and 66 others in the Great Falls-Little Falls 

 section of the Potomac River Valley. Where distribution with re- 

 spect to Plummers Island is not indicated by the records quoted it 

 is denoted by the initials P. I. and V. P. I. (vicinity of Plummers 

 Island). 



For records of specimens, access to collections, and other help in 

 the preparation of the following list the writers are indebted to Dr. 

 J. M. Aldrich and Messrs. Nathan Banks and Charles T. Greene. 



1 For explanation of tbese terms, see Bull. 1, Biol. Soc. Wash., A Sketch of the Natural 

 History of the District of Columbia, etc. 1918. Pp. 57-74. 

 Mdem, p. 81. 



