260 



BEUTENMULLER, MONOGRAPH OF THE SESIID^E. 



Expanse : Male, 30-32 mm. ; female, 35-40 mm. 



Habitat, — Canada, New England States, New York, British Columbia, Vancouver, Colorado, 

 and California. 



Type : One female. Coll. T. W. Harris, Boston Soc. Nat. Hist. 



Allied to Al. apiformis, from which it may be readily distinguished by the 

 lines on the thorax. The moths make their appearance in the field in July and 

 August. In the larval stage it bores in the trunks of willow and poplar. 



Bembecia Hubner. 



Fig. 17. 



Bembecia Hubner, Verz. bekant. Schmett. 1816, p. 128 ; Herrich-Schaeffer, Syst. bearbeit. 

 Schmett. Europa, 1845, p. 61. 



Fig. 17. Anal Tuft, Head, Hind Leg, and Venation of Bembecia marginata. 



Palpi upturned, not reaching the top of the head, with rather long hairs at the base. Head 

 small ; thorax well rounded in front. Abdomen robust, with elevated hairs on the first and second 

 segments. Anal tuft of male short, broad, and flat, that of the female very slight. Middle and hind 

 femora and tibias clothed with hairs. Antennae short, tapering, simple in the female and with long 

 pectinations in the male. Tongue absent. Fore wings with n veins, R 4 and R 5 stalked; Cu 2 

 absent. Hind wings with outer margin strongly sinuate 

 vein Cu 2 running almost parallel. Sc -f R x and Rs stalked. 



Type : Sesia hylmformis Laspeyres, Europe. 



veins M 3 and Cu x on a long stalk 

 Discocellulars erect. 



Bembecia marginata {Harris). 



Plate XXIX, Fig. 14, Female. 



Trochilium marginatum Harris, Am. Journ. Arts and Sciences, Vol. XXXVI, 1839, p. 309 ; 



Morris, Synop. Lepid. N. Am. 1862, p. 137 ; Lintner, 23rd N. Y. State Cab. Rep. 1869 



(1872), p. 60. 

 Sphecia? marginata Walker, Cat. Lepid. Brit. Mus. Pt. VIII, 1856, p. 12. 

 Bembecia marginata Hy. Edwards, note in Ins. Inj. For. and Sh. Trees (Packard, Bull. No. 7. U. S. 



Ent. Com. 1881, p. 261) ; Papilio, Vol. II, 1882, p. 52 ; Grote, New Check List N. Am. 



Moths, 1881, p. n ; nth Rep. Ent. Soc. Ont. 1888, p. 81, fig. 1 ; Riley, Am. Nat. Vol. XVII, 



