320 THE CANADIAN ENTOMOLOGIST 



and adapts itself to the irregularities in the bark, but upon ma- 

 turing it becomes heavily chitinized and extremely rigid. 



The old dead female shells are generally found at the juncture 

 of the twigs in groups of from two to as many as eight. They 

 are of a chestnut brown colour, closely resembling buds, and are 

 dislodged with difficulty, often remaining attached to the bark 

 for several years. Microscopically few structures are visible, 

 the appendages and anal plate having been lost with the second 

 moult. 



Parasites.— -Ps. parasite seems to have been introduced with 

 the species from Europe and is effective in checking the spread 

 of the scale. This was determined to be a new species and was 

 recently described by Girault as Holcencyrtus physokermis. Chei- 

 loneurus albicornis How., and several encyrtids were bred from 

 this insect. 



A NEW CANADIAN NOCTUID. 



BY WM. BARNES, M.D. AND J. MCDUNNOUGH, PH.D. 

 DECATUR, ILL. 



Xylomoia chagnoni, sp. nov. 



cf. — Antennae finely ciliate; head and thorax light ruddy 

 brown, the collar crossed by a black line; abdomen untufted, light 

 ochreous; primaries rather pale ruddy-brown with the maculation 

 not well defined, the most conspicuous feature being a black dash 

 in the sub-median fold connecting the t. a. and t. p. lines; sub- 

 basal line very obscure, angled below costa; t. a. line better de- 

 fined, faintly geminate, the inner line more or less obsolete, the 

 outer black, with a prominent outward angle below vein 1, preceded 

 by a slight dark shade along inner margin; orbicular and reniform 

 v^y faint, rather small, the former oblique, the latter defined on 

 its inner edge by a black lunate mark; claviform scarcely visible 

 resting on the black streak in the fold; t. p. line faint; strongly 

 bent out around cell, then rigidly inwardly oblique to vein 1 where 

 it bends outward slightly to inner margin, it is followed by a few 

 darkjDoints on the veins; s. t. line pale, obscure, irregular, defined 

 outwardly by two darker terminal semi-triangular patches, the 



September, 1917 



