326 AMERICAN PSYCHODID-iE. 



more closely with Haliday's Psychoda than Pericoma, and the adults 

 certainly belong to the old genus Psychoda. The writer believes 

 that a more thorough study of the life histories and a careful com- 

 parison of the European and American material will do much 

 toward establishing a more perfectly satisfactory systematic classifi- 

 cation of this family of flies. 



The aquatic Psychodid discovered by Professor Kellogg in Cali- 

 fornia, and described and figured by hirn in the February number 

 of the "Entomological News," 1901, is of the same general type as 

 the Brazilian forms, although it differs in many details. The larva 

 is broad, with eight ventral suckers. The trachial gills present in 

 the Brazilian larvse were not found in the California specimens. 

 The pupa is flat and broad shield-shape, adhering to the surface on 

 which it rests. 



On comparing the aquatic Psychodid from Florida with Ps. cali- 

 fornica, the writer finds very little correspondence. It is more 

 nearly of the type of Miall's aquatic form. The larva is long, slen- 

 der and cylindrical, without the least sign of ventral sucking discs 

 and anal trachial gills. It is semi-aquatic, being able to remain 

 under water for sometime without coming to the surface to breathe. 

 The pupa is of the usual Tipulid-like type, being cylindrical, rather 

 slender and possessing long, flexible thoracic breathing tubes. 



It will probably be well to include a few notes on Professor Kel- 

 logg's aquatic larvae and pupse before turning to the life history of 

 the Florida species. 



The larvie were found abundant on the first of March and later 

 dates in the mountain streams of Santa Clara County, California. 

 They were present on the stones at the verge of the water, where 

 they were kept moist by the sprays and current. When full grown 

 they attain a length of 2.5 mm. and a breadtli of 1 mm. From the 

 figures they appear flat, but they are rather thick and the dorsal 

 surface quite firm. On the venti'al surface are eight median seg- 

 mentally arranged suckers, by which they hold firmly to the surface 

 of the rocks. There are no thoracic breathing tubes and openings 

 as described for Pericoma by Miall, but simply a pair of anal spira- 

 cles at the tip of the abdomen, between two strong, haired, clavate 

 processes. And no trace of the anal trachial gills, described by 

 Miiller for the Brazilian larvae, was found, though they may have 

 been retracted. 



