THE CANADIAN ENTOMOLOGIST. 115 



the Montreal collectors, who are also familiar with its larva. To them 

 belongs the pleasure of a fuller treatment of the species, its life-history 

 and habit. So it is the intention to proceed only with the species com- 

 mon to the Atlantic seaboard in this latitude, and of which notes on its 

 early history were given by the writer, Can. Ent., XXXII., 276. 



Hydrozcia duovata, sp. no v. 



Expanse 34 to 38 mm. Antennas simple, head smooth in front. 

 Wings rather narrow ; primaries acute ; ground colour dull yellowish or 

 tawny, powdered with dark rusty scales ; when fresh a sheen as of dull 

 brass is noticeable in those portions not affected by the dull purple shad- 

 ings. The ornamentation and markings similar to the species previously 

 described. Basal spots of the ground colour. T. A. line irregular, 

 angulated or saw-toothed till it passes the claviform, when it is strongly 

 outcurved. Inside this line a dull purple area, which is not highly con- 

 trasting. T. p. line geminate, with the customary outward curve over the 

 cell. Median field is dull yellow, and evinces most notably the darker 

 powderings. The shade line is confused until making the angle, from 

 which point it pursues a straight, oblique course to the inner margin. S. 

 t. space evenly defined in dull purple, and the terminal space, except for 

 the yellow apical dash, is scarcely of a lighter shade. The fringes are 

 the same shade of purple. The ordinary spots are white, the reniform 

 rather small, and stained with yellow in its upper outward portion. 

 The orbicular has usually a dark scale at the centre, and is disconnected 

 by the merest thread from the claviform, which is made up of two oval 

 parts. 



Secondaries are dark for this section of the genus. It is the tone 

 here and of the body vestiture which appeals strongly in separating the 

 species. In any species the depth of powderings on the primaries often 

 produces a phase of variation, but the tone of the under wings and 

 abdomen do not alter. One appreciates this with the extended series to 

 be had by breeding, and its force becomes influencing. The male 

 genitalia are typical. Imagoes fly in September, never appearing until 

 nitela -has been in evidence for some time. Types are in National 

 Museum and collection of writer. This occasion is taken to request 

 correspondents to change all ratila labels sent out from Rye to duovata, 

 as this species alone has been dispensed under the Guene'e label. 



To Mr. Wm. Schaus we are indebted for a comparison of the species 

 with tiie type of rutila in the British Museum. A good series in this, 



