MOTHS OF FAMILY WALSHIIDAE — HODGES 309 



vol. 4), p. 7. — Barnes and McDunnough, 1917, Check list of the Lepidoptera 

 of boreal America, p. 152. — Forbes, 1923, Cornell Univ. Agric. Exp. Sta. 

 Mem., no. 68, p. 325.— Fletcher, 1929, Mem. Dep. Agric. India, Ent. Ser., 

 vol. 11, p. 211. — Forbes, 1931, Journ. Dep. Agric. Porto Rico, vol. 4, p. 361. — 

 McDunnough, 1939, Mem. Southern California Acad. Sci., vol. 2, pt. 1, 

 p. 64. 



Type-species: Stilbosis tesquella Clemens, 1860, monobasic. 



Head : smooth-scaled ; labial palpus recm"ved, third segment shorter 

 than second; tongue scaled basally; maxillary palpus folded over base 

 of tongue; eye notched at anterodorsal angle. All surfaces other than 

 hind wings and cilia of fore wings covered with metallic scoles. Fore- 

 wing with patches of raised scales; lanceolate; 12 veins present; 2 

 very v>^eak basally; 6 very short out of 7 and 8; 11 from five-sevenths 

 of cell. Hind wing: narrow lanceolate, 8 veins present. Male geni- 

 talia: symmetrical; saccular margin of valva free apically, heavily 

 sclerotized, series of long, heavy setae at base of costa; uncus linear; 

 aedeagus massive, apex acute. Female genitalia: ostium bursae 

 large, surrounded by narrow sclerotized ring; ductus bursae and bursa 

 copula trix granulose ; one or two signa present. 



This genus probably has its center of distribution in Central or 

 South America with only two species occurring north of Mexico. 

 S. tesqudla has been taken from New York to northern Arizona. S. 

 nuhila is laiown from the type locality in southern Arizona. Examina- 

 tion of the genitalia of the species of Stilbosis, which Walsingham (1909) 

 recorded as S. tesquella, indicates that the specimens are neither 

 S. tesquella nor S. nuhila, new species. 



Key to North American Species of Stilbosis 



BASED ON VENATION 



Vein 2 of forewing present only at margin S. nubila, new species 



Vein 2 of forewing visible from cell S. tesquella Clemens 



BASED ON MALE GENITALIA 



Ventral margin of sacculus relatively straight (fig. 22) . . . S. tesquella Clemens 

 Ventral margin of sacculus sinuate (fig. 23) S. nubila, new species 



BASED ON FEMALE GENITALIA 



Ostium bursae round, with lateral sclerotized projections (fig. 41). 



S. tesquella Clemens 



Ostium bursae somewhat triangular, without such lateral sclerotized extensions 



(fig. 40) S. nubila, new species 



Stilbosis tesquella Clemens 



Figures 22, 22a, 41, 63 



Stilbosis tesquella Clemens, 1860, Proc. Acad. Nat. Sci., Philadelphia, vol. 12, p. 



170; in Stainton, 1872, The Tineina of North America, p. 129. — Walsingham, 



1882, Trans. Amer. Ent. Soc, Philadelphia, p. 197.— Riley in Smith, 1891, 



List of the Lepidoptera of boreal America, p. 107. — Dyar, 1902 [1903], 



