312 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 115 



The major characters separating S. nubila from S. tesquella are 

 those given in the keys. 



Sorhagenia Spuler 



Figures 4, 10, 64 



Sorhagenia Spuler, 1910, Die Schmetterlinge Europas, vol. 2, p. 384. — Fletcher, 

 1929, Mem. Dep. Agric. India, Ent. Ser., vol. 11, p. 205 (as synonym of 

 ChrysocUsta) . — Pierce and Metcalf, 1935, The genitalia of the tineid families 

 of the Lepidoptera of the British Islands, p. 28. 



Cystiocetes Braun, 1915, Canadian Ent., vol. 47, p. 194 (type-species: Cystioecetes 

 nimbosus Braun, 1915, original designation). — Barnes and McDunnough, 

 1917, Check list of the Lepidoptera of boreal America, p. 152. — Fletcher, 

 1929, Mem. Dep. Agric. India, Ent. Ser., vol. 11, p. 63.— McDunnough, 1939, 

 Mem. Southern California Acad. Sci., vol. 2, pt. 1, p. 63. New synonymy. 



Type-species: Elachista rhamniella Zeller, 1839, monobasic. 



Head: smooth-scaled; tongue moderate, scaled basally; labial 

 palpus recurved, second segment longer than third, apex of third 

 segment acute; maxillary palpus folded over base of tongue; antenna 

 half length of forewing, scape three times longer than wide, slightly 

 enlarged distaUy, pecten present; ocelli present. Forewing: lanceolate, 

 patches of raised scales present; 11 or 12 veins present; 2 weak or 

 absent, from two-thirds of cell; 3, 4, and 5 separate; 6 separate or 

 stalked with 7 and 8; 7 and 8 stalked, 7 to costa. Hind wing: sub- 

 linear; 8 veins present; 1 weak; 2, 3, and 4 remote; base of 5 weakly 

 present; 6 and 7 stalked. Metathoracic tibia with long scales dorsally. 

 Male genitalia: symmetrical; valva with separate costal and saccular 

 areas; aedeagus small in relation to entire genitalia, distal portion 

 somewhat reduced; uncus reduced; juxta(?) present. Female geni- 

 talia: ostium bursae at posterior margin of seventh sternum; ductus 

 bursae heavily sclerotized for length within seventh sternum, mod- 

 erately heavily sclerotized for remainder of length, latter portion with 

 series of shallow constrictions; bursa copulatrix with two signa; 

 heavily sclerotized, medial plate extending entire length of seventh 

 sternum; apophyses anteriores not connected by sclerotized band. 



The larva of the European species, S. rhamniella, feeds on Rhamnus 

 spp., and S. nimbosa has been reared on Rhamnus. 



Sorhagenia seems to be related most closely to parts of Aeaea in 

 relation to the male genitalia; also, the reduction of vein 2 in the 

 forewing is very similar in the the two genera. 



Key to North American Species of Sorhagenia 



BASED ON MALE GENITALIA 



"Juxta" somewhat thimble-shaped with depressed apex, series of more heavily 

 sclerotized transverse bands (fig. 20) S. nimbosa (Braun) 



