07 



straighter costa of fore wings, and rather more oblique outer edge, and the 

 longer hind wings. 



The most aberrant species is G. Sabiniaria, which, in the pectinated 

 antennae and venation, forms a subgenus, but which I do not think should lie 

 separated genetically from G. polata. Both of these two arctic species differ 

 from the others, even G. ccesiata, in the hairy head and body. 



Spargania magnoliata of Guenee is very closely allied to G. 'polata in 

 structure as well as in its peculiar style of markings, and the genus is evi- 

 dently a synonym of the present one. 



Larva. — The body is of equal thickness from the head to the end. 



Head much rounded, not so wide as the body. Supra-anal plate sometimes 



rounded posteriorly. Feeds on species of Yaccinium, spinning a slight cocoon 



among the leaves of its food-plant. It hybernates, pupating late in the 



spring. 



Synopsis of the Species. 



A. <$ antennae simple : 



Larger than the other species. Fore wings with convex costa ; a double, wavy, extra- 

 discal line, bent below the costa, and a more distinct, whitish, suhmargiiial 

 line. Olive-gray, witli numerous, scattered, golden scales (,'. cwsiata. 



Costa straighter than in '.'. ccesiata. Steel whitish-grayish, witli about twelve wavy 



lines; hind wings flesh-colored (/'. magnoliata. 



Ochreous-gray, with numerous, transverse, dark lines; median band narrow, pale, 



with a dark discal dot ; hind wings whitish G. implicata. 



Granite-gray, with a distinct median baud, rows of dark points, and scattered yellow 



scales; hind wings gray, a little dusky on the margin G. polata. 



B. $ antennae pectinated : 



• 



Undersized. Uniform sable-brown ; fore wings with a single, median, dusky band. 



Fringe sable-brown G. Sabiniaria. 



Large size. Yellowish-gray, with broadly-pectinated antenna', median band, and 



submarginal, waved, whitish line. Fringe yellowish, checkered with dark. ..G. phocataria. 



Glaucoptekyx c.esiata Hiibner. Plate 8, fig. 10. 



"Geometra ccesiata Borkh., Fur. Sclim., v, 331, 109, 1/04." 



" Den. et Schiff., Syst. Verz. Schrn., i, 448, 1775." 

 "Lang., Verz., ISO, 178:2." 

 " Hiibu., Schm. Fur., 275, 1790." 

 Glaucopteryx cwsiata Hiibu., Verz.. 332, 1818. 

 Larentia cwsiata Treits., Schm. Ear., vi, part '-', 89, 1828. 



Dnp., Lep. Fiance, viii (v), 39rf, pi. 199, fig. 2, 1830 



Guen., Thai., ii. 271, ls;,7. 



Walk., List Lep. Br. Mus., xxiv, 1173, 1802 



40 S and 40 9. — Body and wings dull smoky -gray, with a decided oliva- 

 ceous tinge, dusted with golden scales. Front whitish, with dusky scales ; 

 base of the antennas whitish, beyond minutely annulated with while; palpi 



