82 BULLETIN 190. UNITED STATES NATIONAL MUSEUM 



slightly bulbous at base; sacculus ridge with a thin, slightly curved row of 

 flat, biforked scales. Female genitalia with ductus sclerotized posteriorly, 

 ending in a vase-shaped ostium ; no signum or at most a small, slightly 

 granulated, oval spot. 



The genotype is figured on plate 1, figure 7, and plate 3, figures 26, 27. 



CONOPIA ALBICORNIS (Hy. Edwards) 



Aegeria albicornis Hy. Edwards, Papilio, vol. 1, p. 201, 1881. — Beutenmuller. 



Ann. New York Acad. Sci., vol. 5, p. 205, 1890; Bull. Amer. Mus. Nat. Hi.st., 



vol. 4, p. 174, 1892. 

 Sesia albicornis Beutenmuller, Mem. Amer. Mus. Nat. Hist., vol. 1, pt. 6, p. 292, 



pi. 31, fig. 23, pi. 33, fig. 15, 1901. 

 Synanthedon albicornis McDunnough, Check list of the Lepidoptera of Canada 



and the United States of America, pt. 2, No. 8723, 1939. 



Male. — Antennae black, moderately dilated toward tips, finely pec- 

 tinated and narrowly but plainly marked with white before the tips. Labial 

 palpi rough, pale yellow beneath, black above. Head, thorax, and abdomen 

 bluish or purplish black. Abdomen sometimes, though usually not, edged 

 very narrowly and faintly with white on segment 2 above and along the 

 sides ; anal tuft wedge-shaped, white in the middle beneath. Wings trans- 

 parent ; veins, discal marks, costae, and outer margins metallic black. Fore- 

 wing beneath shaded with bright yellow along costa from discal mark to 

 wing base. Veins 3 and 4 on hindwings on a short stalk. Legs steel blue, 

 forecoxae white, tibiae tufted, white at the spurs, which also are white. 

 Tarsi whitish at the joints and at tips. 



female. — Similar to the male. Labial palpi not so rough or so white 

 as those of the male. Antennae marked with white for one-third of their 

 length before the tips. Anal tuft narrow, roimded at end, and black 

 throughout. 



Expanse: Male 18 to 20 mm., female 16 to 22 mm. 



Distribution. — Rocky Mountains, Colorado, Idaho, Sierra Nevada, 

 Sierra Madre, California to Washington. 



Type. — Female (Nevada, Morrison). In collection F. Tepper, Michi- 

 gan Agricultural College. 



Ke marks. — Check lists synonymize proxima (Hy. Edwards) and mo- 

 desta Kellicott with albicornis, but on critical examination of ample material 

 it is found that western examples differ specifically from eastern speci- 

 mens. Conclusive evidence of this is furnished by the male genitalia. The 

 sacculus of albicornis shows a curved line of flat scales ending in a point ; in 

 proxima the line of scales terminates distinctly in a hook. Furthermore, 

 there are external differences. The labial palpi of albicornis in both sexes 

 are pale yellow ; in proxima only the male palpi are pale yellow, the female 

 palpi are black. C. albicornis lacks the narrow, pale yellow lateral stripes 

 present on the thorax of proximo. The antennae of albicornis are plainly 



