802 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxvii. 



brown centers, absent on joints '•I and 3, small on tt, covering^ wart ii 

 on 5, 8, 9, and 12, coverino- i onl}" on joints 6, 7, and 10, just to wart ii 

 on joint 11 by a branch, absent on 18. 



Stage V. — No chano-e. Width of head 2.6 mm. 



Stage VI. — Head g-reen, the upper half thickly covered with angular 

 black spots, a small light red patch on ^'ertex of each lobe; antenna; 

 black ringed, setae white; width 3.S nnn. Body moderate, equal, 

 joint 12 a little enlarged dorsal ly. Warts small, reduced, consisting 

 of a group of few tubercles. Secondary hair present on sides and 

 subventrally, longer below. Oliv^aceous blackish, black granular on a 

 dark olivaceous ground. Warts i, ii, and iv black, with pale tubercles, 

 iii and v light green, vi dusky; slight greenish dilutions subdorsally 

 below tubercle i on joints 5, 8, 9, and 12. Hair black and white, the 

 secondary hair mostly white. Spiracles white, black rinnned; no de- 

 fined markings. 



The larvae in this stage closel}^ resemble the bark of birch, on which 

 they were fed. 



APATELA MINELLA Dyar. 



One specimen, June 13. No female was obtained, so the life history 

 remains unknown. I had suspected that this species was the western 

 form of fragnh Guenee, but I have normally light colored fragilh 

 from Wellington, British Columbia (G. W. Taylor), on the coast. A 

 series of specimens is required to form a definite opinion. 



APATELA GRISEA Walker, var. REVELLATA Smith. 



Twenty specimens, June 13, 16, 18, 19, 30, July 2, 8, 15, 19, 21, 29 

 (Bear Lake). This form is generally larger and darker than eastern 

 grisea., as usual Avith western forms, l)ut not specifically distinct, I 

 think. Some of the moths are nearly as pale as normal grisea. The 

 larva?, too, are the same. 



Egg. — Nearly hemispherical, not much flattened, no rim, the sides 

 perpendicular, domed. Ribs, about 60, waved, smooth, no reticula- 

 tions, diminishing above, forming an irregular ring around the micro- 

 P3de, which is shagreened. Palo bluish green. Diameter, 0.9 mm.; 

 height, 0.45 mm. Hatched in seven days, without change of color. 



Stage I. — Head, bilobed; mouth, ))roadly projecting; eye, black; 

 jaw, brown. Bodj^ uniform, joint 12 a little enlarged, white, immacu- 

 late; hair, white, spinulose; hairs i to iii, long, fine; iv and v, shorter, 

 weak. Hairs all single, no subprimaries, ia + ib on thorax. No 

 shields; tubercles, concolorous, all pale and transparent. Dorsal warts, 

 conically elevated; feet, equal. Later joints 2, 5-6, 9-10, and 12 have 

 diffuse violaceous dorsal patches. Still later purple brown spots 

 appear, small, rounded, covering tubercle ii onl}^ on joints 2, 1, 5 (the 

 one on 4 smaller than that on 5), 8, 9, and 12. Warts, white, except 

 in the dark spots. 



