BEUTENMULLER, MONOGRAPH OF THE SESIID^E. 245 



In color this species is subject to variation. The abdomen is more or less 

 banded with yellow and the thorax is sometimes almost entirely chestnut red. 

 The female deposits her eggs in patches on roughened or knotty places on the 

 bark of ash and lilac. The eggs, according to Hulst, hatch in about six days, and 

 the newly-born larvae at once eat their way through the bark into the solid wood. 

 They run their channels longitudinally for about eight to ten inches through the 

 wood (Plate XXXVI, Fig. 1). The larvae pupate in slight cocoons after cutting 

 their way to the bark, of which they leave only the thin outer skin. The pupa- 

 tion usually takes place early in May and the moths emerge in about three weeks. 



Podosesia fraxini {Lugger). 



Plate XXX, Fig. 15, Female. 



Trochilium fraxini Lugger, Psyche, Vol. VI, 1891, p. 109, pi. iii, fig. 4; 1st Rep. Ent. Agricul. 



Exp. St. Minn. 1895 (1896), p. 94, fig. ; Aldrich, Insect Life, Vol. IV, 1891, p. 68. 

 Algeria fraxini Orcutt & Aldrich, Bull. 22 S. Dak. Agricul. Exp. St. 1891, pp. 80-83, fig- Ir - 

 Podosesia fraxini Beutenmuller, Bull. Am. Mus. Nat. Hist. Vol. VI, 1894, p. 8S ; ibid. Vol. VIII, 

 1896, p. 125 ; ibid. Vol. IX, 1897, p. 219. 



Male. — Head black between the eyes ; face dirty whitish ; palpi dull orange, mixed with some 

 black hairs ; collar reddish orange in front, yellow behind. Antennae rufous. Thorax blackish, 

 with the patagia becoming yellow posteriorly ; tran verse mark at base of thorax yellow. Abdomen 

 black, with a yellow band at the posterior end of each segment, or the last four segments are wholly 

 yellow, or are marked with orange at the sides, sometimes extending almost over the whole surface 

 of the last three. Fore wings opaque except a short transparent and orange brown basal streak, with 

 the discal mark heavier, veins at base sometimes stained with red ; underside golden yellow. Hind 

 wings transparent, margin and veins yellowish brown ; underside stained with yellow. 



Female. — Similar to the male, but more robust and larger. 



Expanse : Male, 25-30 mm. ; female, 30-35 mm. 



Habitat. — Montana, Dakota, Minnesota. 



Allied to P. syringes, but differs from it by having ochreous fore wings and 

 the abdomen banded with yellow. The habits and food-plant of the larvae are 

 the same as those of syringce. 



Memythrus Newman. 



Fig. 14. 



Memythrus Newman, Sphinx vespiformis, An Essay, 1832 ; Ent. Mag. Vol. I, 1832, pp. 44-47. 

 Sciapteron Staudinger, Sesiis Agri. Berol. 1845 V Ent. Zeit. Stett. Vol. XVII, 1856, p. 195. 

 Tarsa Walker, Cat. Brit. Mus. Pt. VIII, 1856, p. 61. 

 Fatua Hy. Edwards, Papilio, Vol. II, 1882, p. 97. 



Palpi strongly upturned, first and second joints very long, with thick hairs, third joint short, 

 with appressed scales. Antennae more or less pectinate, with fascicules of cilia. Abdomen of 

 the male with anal tuft straight, bunch-like, or with four long pencils at base of last segment. 

 Tongue present. Fore wings 12-veined; veins R 4 and R 5 stalked. Hind wings with veins 



