OF WASHINGTON, VOLUME XVII, 1915 11 



a former meeting of this society 1 Mr. Busck has given an accouni 

 of the manner in which they are made. His observations were 

 on M. salictella Clem., but, inasmuch as there is no reason for 

 supposing the method to be different for the other Gracilariidse 

 having a similar habit, we may note his remarks here. In sub- 

 stance he says: after the outer covering of the cocoon is com- 

 pleted a slit is bitten through by the larva. A small globule 

 secreted from the anus is then forced into th opening by the 

 mandibles, fastened by a loop of silk and the slit sewn together. 

 This process is repeated until the bubble content of the alimen- 

 tary canal is exhausted. 



PUPA. 



Within its silken enclosure the pupa (pi. 9, fig. 3) is plainly 

 visible. Throughout the pupal period it is noticably active, re- 

 volving rapidly on the axis of the body when disturbed; greenish 

 brown and structurally normal according to Chapman's classifi- 

 cation of the Gracilariidse. 2 



Pupal period; six to ten clays in summer. 



ADULT. 



The imago has steely-greyish-white palpi with two black rings 

 on the terminal joint and two, and a faint third, on the second 

 joint. Head and face whitish, streaked with black or blackish 

 brown, the appressed scales falling well over the eyes and front. 

 Thorax steel grey streaked with black, the dark -portions more 

 crowded towards the center. Forewings grey, suffused with 

 brown giving the ground color a light, rather even, brownish 

 tint; from the costal and dorsal margins several oblique white 

 streaks interspersed with irregular patches and lines of black 

 scales, these markings varying considerably in intensity and dis- 

 tinction of definition in different specimens but averaging as 

 shown in the drawing (pi. 8, fig. 1); the apical area dark brown 

 shading to black; apical cilia greyish white with a median band 

 of black or blackish brown, white at the base, this. white band 

 forming with the costal and dorsal streaks of the apical portion 

 a nearly complete white circle about the darkened area; costal 

 cilia brownish; dorsal cilia brownish grey. Hind wings brownish 

 grey; cilia concolorous, darkening toward apex. Abdomen brown- 

 ish grey above, silvery beneath; the segments diagonally streaked 

 along the sides with black, the streaks meeting obscurely on the 

 dorsum. Legs whitish, striped with Mack. Anal tuft black, 

 slightly marked with grey. Viewed from below the entire inject 



1 Proc. Was!!. Knl. Sue., v, 102, 1 {):>. 



- The Kntnmoloirist . Loml., vol. xxxv, pp. HI U'J, 1 !)_'. 



