26 THE CANADIAN ENTOMOLOGIST. 



contrasting areas, of which the median space is unduly contracted, and 

 has on the inner margin of the wing less than one-third of this extent, an 

 unusual feature. A slight powdering of glistening-gray scales occurs, but 

 they are more minute and scattered in this species. No basal markings ; 

 all inside the t. a. line is grayish- brown with the lilac tinting. The spots 

 are wanting in the median field, which is of a solid brown or umber hue, 

 excepting one specimen of the series, which shows the central, lunulate 

 marking of the reniform, barely defined with grayish scales. The t. p. 

 line is the more evident marking, and is straight or nearly so in its 

 oblique course ; it is fasciate rather than geminate, accentuated outwardly 

 by a grayish i:)owdering that affects the whole terminal space ; the under 

 colour is the same lilac-gray as the anterior space. The s. t. line is 

 obsolete, or traceable only by a few glistening scales. Subterminal space 

 darkens at the margin. The fringes are silken and slightly dentate. 

 Secondaries pale smoky-brown. Beneath the usual powderings over a 

 lighter ground colour. The structural characters of the male show no 

 departure from the typical form. Expanse, 1.25 to 1.50 inches ; 32 to 



37 "^'"^1- 



Co-types are placed in the U. S. National and the British Museums. 

 Seventeen examples, from various points within a four-hundred-mile 

 radius, happen to be at hand for description, but the species is doubtless 

 common throughout the geographical range of its food-plant. It comes 

 closest, perhaps, to ?iiUla, but its darker, browner tone easily separates it, 

 and the very late date of flight is a noticeable feature. 



The food-plant is Collijisonia Cafiade?isis, and the young larvae do 

 not hatch from the hibernated eggs until the middle of June in this locality. 

 The stem is entered a few inches above ground, where sufficiently tender, 

 and a gallery is extended to the peculiar woody root-stock. But a limited 

 cell is here made, though the last three stages are passed in the root 

 proper, and pupation generally occurs there if the tissues are not broken. 

 The young larvae are typical with the iiitela series. In the penultimate 

 stage we find the typical, cylindrical larva, from which the previous darker 

 colouring has faded to a soiled, whitish translucence, and having the 

 continuous dorsal line in evidence. Head, 2.2 mm. wide ; chestnut- 

 brown, darker than nitela^ and with the side marking less distinct. The 

 thoracic and anal plates are also darker, and the tubercles, though small, 

 are better defined than in the ally. While the leg plates bear setse, there 



