LEONARD HASEMAN. 299 



A IVIoiiograpli or the North American Psyehodidse, 



lucluding Ten ]Vew Species and an Aquatic 



Psychodid from Florida. 



BY LEONARD HASEMEN, COLUMBIA, MISSOURI. 



(Presented as a Thesis in Zoology for the Degree of Master of Arts, Indiana University.) 



(Plates V-VIII.) 



In prepariug this paper the writer has attempted to give as accu- 

 rate and as complete an account of our present knowledge of the 

 mature and immature stages of the North American members of 

 this family as possible. He has met with some little disappoint- 

 ment, however, in being unable to get specimens of several of the 

 named species. It has been impossible for him to leave his work 

 and visit the various collections, and the fragility of the flies has 

 caused some little hesitancy in the loaning of specimens. For the 

 species which he has unfortunately not been able to examine the 

 original description of the type has been used whenever possible. 

 Any minor detail errors that may be present in these type descrip- 

 tions or errors in the generical location of these species are largely 

 beyond his control. It does not seem at all probable, however, that 

 there has not been more than a single species of Pericoma taken in 

 the East, and as Kincaid once suggested, it is quite likely that some 

 of these Psychodae are really Pericomse, but from the type descrip- 

 tion the writer is unable to say definitely. A species from Cuba by 

 Williston and one from Guatemala by Coquillett, together with ten 

 new species, have been included. Notes on Professor Kellogg's 

 aquatic larvae and pupae and the life history of a new species from 

 Florida have also been given. 



The Psychodidae have been very appropriately called " moth 

 flies" from the resemblance which they bear to tiny moths. In 

 most species the wings are broad and held roof-like in repose, which, 

 together with the hairy vestiture of the body and wings, gives the 

 flies the moth-like appearance. They are very small, the wings of 

 the largest not exceeding about 4 mm. in length, so that they are 

 seldom taken, except by careful collectors. They shun the sunshine 

 and are most readily found upon shaded windows, upon the trunks 



TEANS. AM. ENT. SOC. XXXIII. SEPTEMBEB, 1907. 



