22 BULLETIN 190, UNITED STATES NATIONAL MUSEUM 



RAMOSIA, new genus 



Genotype, Sesia bibionipennis Boisduval. 



Male antennae short!}' ciliated; female antennae simple. Tongue pres- 

 ent, spiraled. Laljial palpus with a rather strong, uneven brush on second 

 joint, third joint upright, smooth, hardly reaching vertex. Head and 

 thorax smooth. Forevving with 12 veins; 7 and 8 stalked, 7 to apex or 

 above, 10 and 11 confluent near the edge of the wing. Hindwing with 8 

 veins ; 3 and 4 short-stalked, 7 and 8 concealed in costal fold. Posterior 

 tibiae nearly smooth, with small tufts of stiff scales at spurs; first tarsal 

 joint smooth, not thickened. Anal tuft fan-shaped. Male genitalia of the 

 Synanthedon type ; uncus large, covered with bifurcate hairs ; tegumen 

 curved ; aedeagus long, slender, slightly bulbous at base ; harpes elongate- 

 ovate, costal and terminal half thickly clothed with bifurcate hairs, sacculus 

 ridge with blunt, flat scales; vinculum rather short, bluntly pointed. Fe- 

 male genitalia with terminal part of ductus more or less sclerotized, bursa 

 without signum. 



The species in this group are outstandingly beautiful, lustrous black, 

 yellow, and red, and they are remarkable for color variations. Early au- 

 thors erected on too scant material species which prolonged field investiga- 

 tions and long series of reared examples prove to be only color varieties. 



The group ranges from north Mexico to Alaska. Much more care- 

 fully labeled informative material is needed to conclude to what extent 

 species, races, and variations are involved. 



RAMOSIA POLYGON! (Hy. Edwards) 



Pyrrhotaenia polygoni Hy. Edwards, Papllio, vol. 1, p. 202, 1881. — Beutenmuller, 

 Bull. Amer. Mus. Nat. Hist., vol. 4, p. 174, 1892; vol. 6, p. 95, 1894; vol. 8, p. 144, 

 1896. 



Pyrrhotaenia achillae Hy. Edwards, Papilio, vol. 1, p. 203, 1881. — Beutenmuller, 

 Bull. Amer. Mus. Nat. Hist., vol. 4, p. 174, 1892; vol. 8, p. 144, 1896. 



Pyrrhotaenia creinocarpi Hy. Edwards, Papilio, vol. !■, p. 203, 1881. — Beuten- 

 muller, Bull. Amer. Mus. Nat. Hist., vol. 4, p. 174, 1892. 



Sesia polygoni Beutenmuller, Mem. Amer. Mus. Nat. Hist., vol. 1, pt. 6, p. 308, 

 pi. 32^ figs. 8, 9, 1901. 



Synanthedon polygoni McDunnough, Check list of the Lepidoptera of Canada and 

 the United States of America, pt. 2, No. 8749, 1939. 



Sexes dissimilar. 



Male. — Antennae metallic black. Labial palpus red, black at the sides 

 and on third joint. Head black. Collar black, mixed with red. Thorax 

 lustrous green-black, patagia striped with red and a red mark at the sides, 

 behind the collar. Abdomen lustrous green-black, segments 4, 6, and 7 

 red above and all segments red laterally ; anal tuft fan-shaped, red in the 

 center, black at the sides. Legs predominantly black, posterior tibiae red 

 before and between the spurs, tarsi black. 



