898 Charles Paul Alexander 



Rumex aquaticus. The two local species live in organic mud in swamps, 

 and both the larvae and the pupae are decidedly eriopterine in appearance. 

 The local species of the genus Rhamphidia may be separated in accord- 

 ance with the following key: 



Rostrum short; legs yellow, tips of femora and tibiae black; wings tipped with dusky. 

 [Dipt. Exot., 5th supp., p. 17. 1855. Osten Sacken, Mon. Dipt. N. Amer., part 4, 

 p. 105-106. 1869.] (Plate XXXIII, 42.) R. fiavi-pes Macq. 



Rostrum long; legs uniformly dark brown: wings uniformly subhyaline, not tipped with 

 dusky. [Proc. Acad. Nat. Sci. Phila., p. 498-499, pi. 25, fig. 14. 1916.] (Plate XXXIII, 

 43.) R- mainensis Alex. 



Genus Elephantomyia Osten Sacken 



1859 Elephantomyia 0. S. Proc. Acad. Xat. Sci. Phila., p. 220. 



The genus Elephantomyia includes about eight species, found in North 

 America, Europe, Africa, and eastern Asia. The complete wing venation 

 separates the flies from all other genera with an elongate rostrum, except 

 the Oriental genus Rhampholimnobia Alex. The immature stages of the 

 known species are spent in decaying wood. 



Elephantomyia westwoodi 0. S. 



1869 Elephantomyia westwoodi 0. S. Mon. Dipt. N. Amer., part 4, p. 109, pi. 1, fig. 5. 



The species Elephantomyia westwoodi is a curious fly inhabiting cold 

 Canadian woods and bogs, where it is found on the wing from late June 

 into August. R. C. Shannon collected larvae at Washington in late 

 November of 1912, and again on May 2, 1913, and reared the fly. It had 

 been bred before by Johnson. 



The adult is yellow with the abdominal segments ringed caudally 

 with brown and the wings having a distinct brown stigma. The large 

 square cell 1st M2 is a conspicuous feature of the venation (Plate 

 XXXIII, 44). 



Genus Toxorhina Loew 



1835 Limnohiorhynchus Westw. Ann. Soc. Ent. France, vol. 4, p. 6S3. 



1851 Toxorhina Loew. liinnaea Entomol., vol. 5, p. 400. 



1869 Toxorrhina O. S. Mon. Dipt. N. Amer., part 4, p. 109-114. 



The small genus Toxorhina includes about nine described species, 

 most of which arc from tropical America. The exceedingly reduced 

 radial sector is the most interesting characteristic of the adult. The larval 



