378 PROCEEDINGS OF THE NATIONAL MUSEUM vol. ii8 



Dicosmoeciis palatus (McLachlan) 



Figure 2j 

 Stenophylax palatus McLachlan, 1872, p. 63. 

 Dicosmoecus obscuripennis Banks, 1938, p. 76, figs. 4, 5. [New synonymy.] 



No significant differences could be found between the type of 

 obscuripennis Banks from Alaska, and an example of palatus 

 McLachlan from the River Kolyma, Siberia. The lateral sheaths 

 of the aedeagus in this species are very long and slender and are 

 capped by a few spines and 1 or 2 nearer the base. The basal ridge 

 of the clasper is long with the upper end slightly separated, but 

 not developed into a sharp tooth. These specimens of this species 

 are a bit smaller than the other species and colored a more uniformly 

 darker brown. 



Dicosmoecus frontalis (Banks), new combination 



Drusinus frontalis Banks, 1943, pp. 350-351, figs. 28, 29. 



The unique female type of this species was studied. The genitalia 

 of the type indicate that the species does not belong in Drusinus 

 but in the Dicosmoecinae, most probably in Dicosmoecus. D. aureo- 

 ventris Davis is probably a synonym, but until a series containing 

 both sexes becomes available, I hesitate to establish the synonymy. 



Allocosmoecus partitus Banks 



Figures 2k, I 

 Allocosmoecus partitus Banks, 1943, pp. 365-366, figs. 73, 74, 76. 



This very large caddis fly bears a striking superficial resemblance 

 to the larger species of Dicosmoecus. The genitalia, however, are 

 totally different and fully substantiate a separate generic status. 

 The figures were drawn from the unique male type. 



Pseiidostenophylax edwardsi (Banks) 



Anisogamus edwardsi Banks, 1920, p. 345. 



Anisogamus atripennis Banks, 1924, pp. 440-441. [New synonymy.] 



The abdomens of the female type of atripennis and the allotype and 

 another female of edwardsi were cleared and studied. No differences 

 could be found between their genitalia, and additionally the two types 

 bear the same data. The type of atripennis is larger and more uni- 

 formly dark brown than edwardsi, but these are apparently only 

 superficial differences. 



Pseiidostenophylax sparsus (Banks) 



Halesus sparsus Banks, 1908a, pp. 63-64, fig. 12. 



Stenophylax calypso Banks, 1911, p. 350, fig. 25. 



Drusinus virginicus. — Ross (not Banks), 1944, p. 202, fig. 696. 



This species is fairly common over most of eastern North America. 

 Ross (1944) published the only good figure of the male genitalia of this 



