374 PROCEEDINGS OF THE NATIONAL MUSEUM vol. iis 



In this paper an attempt is made to elucidate many of these enig- 

 matic species. On occasion the result has been the synonymy with 

 some well-known, adequately figm*ed species, while in other cases it 

 has been necessary to prepare figures for a species not well illustrated 

 by present-day standards. In the genus Dicosmoecus, and to a lesser 

 degree in Leytocella and Brachycentras, it has been necessary to do a 

 more complete study of all the related species. No attempt is made 

 to give descriptions or complete bibliographies of any of the species. 

 The original description is cited and a subsequent reference is added 

 to an adequate figure whenever one exists, and in a few cases some 

 salient characters are pointed out. 



I wish to thank Dr. P. J. Darlington, Jr., and Dr. H. E. Evans for 

 theu' help during my visits. 



Family Psychomyiidae 



Phylocentropus carolinus Carpenter 



Figures la,b 

 Phylocentropus carolinus Carpenter, 1933, p. 43, fig. 9. 



The original figiu-es of this species were prepared from an unrelaxed 

 specimen. The figures here presented were prepared from the 

 cleared, relaxed type. 



Family Hydropsycliidae 



Diplectrona californica Banks 



Figures ld,e 



Diplectrona californica Banks, 1914, p. 253, fig. 63. 



Diplectrona margarita Denning, 1965, pp. 83-84, figs. 14-15. [New synonymy.] 



Because the genitalia of this species have not been well illustrated, 

 figm-es are given of the unique male type. 



Denning recently described D. margarita from San Bernardino 

 County, Calif. His figures of the genitalia of margarita leave no 

 doubt that it is the same as californica. 



Aphropsyche doringa (Milne), new combination 



Diplectrona doringa Milne, 1936, p. 68. 



Aphropsyche aprilis Ross, 1941, p. 79, fig. 60. [New synonymy.] 



The male holotype of doringa is present in the collection in the 

 Museum of Comparative Zoology rather than lost, as stated by Ross 

 (1944). The type is identical to Ross's figures of aprilis and to a male 

 in my collection from North Carolina. 



