194 BULLETIN 190, UNITED STATES NATIONAL MUSEUM 



used in emerging by cutting through the bark. Except for the pale 

 color variety alhlcoma of the Eastern Slates, the species runs true to 

 type throughout its transcontinental range. Its depredations on culti- 

 vated blackberries and raspberries have been particularly serious in the 

 coastal areas of the Northwestern States. 



The European species, Bemhecia hylaeiformis (Laspeyres), is a near 

 relative, with similar food plants and habits. However, the European 

 species is said to fly at night, but the North American species is not known 

 to do so. 



The color variety albicoma is found occasionally in the Atlantic Coast 

 States associated with typical marginata. The only examples in the United 

 States National Museum are males. They are from Pittsburgh, Pa., 

 August 24, 1905 (Henry Engel), and Woodhaven, Long Island, N. Y., 

 September 8, 1919 (Engelhardt). 



BEMBECIA MARGINATA variety ALBICOMA Hulst 



Bemhecia marginata van albicoma Hulst, Bull. Brooklyn Ent. Soc, vol. 6, p. 10, 

 1883.— Beutenmuller, Bull. Amer. Mus. Nat. Hist., vol. 5, p. 23, 1893 ; vol. 8, 

 p. 119, 1896; Mem. Amer. Mus. Nat. Hist., vol. 1, pt. 6, p. 262, 1901. 



Male. — Differs from typical marginata only in having the yellow mark- 

 ings replaced by pale straw color or white. This variation is more fre- 

 quent in males than in females. 



Distribution. — Eastern United States. 



Type. — Male. In the American Museum of Natural History. 



THE ZENODOXUS GROUP 



Genus ZENODOXUS Grote and Robinson 



Zenodoxus Grote and Robinson, Trans. Amer. Ent. Soc, vol. 2, p. 183, 1868. 

 (Genotype, Zenodoxus viaculipes Grote and Robinson.) 



Antenna of the male thin, strongly biciliate, tapering toward apex, 

 apex without hair tuft ; female antenna shortly ciliate. Tongue rud- 

 mentary. Labial palpus short, porrect, somewhat flattened, roughly and 

 heavily scaled, scales projecting above the tip. Head and thorax smooth. 

 Forewing narrow, with 12 veins ; veins 2 and 3 connate or stalked, the 

 rest separate, 7 and 8 separate, 7 to costa just above apex, 8, 9, 10, and 

 11 well separated, parallel. Hindwing with 8 veins, all separate, vein 3 

 nearer to 2 than to 4, veins 7 and 8 obscured in the costal fold. Posterior 

 tibia smooth with strong, rough tufts at spurs. First joint of posterior 

 tarsus thickened with rough scaling. Anal tuft in both sexes short, 

 rounded. Male genitalia very uniform in the species included in the 

 genus, giving but .slight help in specific differentiation; uncus (or uncus 

 and socii united) short, upright, slightly divided at tip, with sparse 

 single unspecialized hairs ; ventral plate straight, narrow ; harpe short, 

 quadrangular with costal and dorsal edges parallel, terminal edge slightly 

 curved and more or less oblique ; vinculum with a short rounded anterior 



