FIG o-i 



THE CANADIAN ENTOMOLOGIST. 167 



DESCRIPTION OF A NEW ARCTIA FROM COLORADO. 



BY CHAS. R. DODGE, WASHINGTON, D. C. 



Arctia Williamsii, n. s/>. — (See fig. 34). 

 Anterior wings rich chocolate - brown with 

 creamy white stripes or markings. Costal mar- 

 gin lighter brown. A broad line running from 

 j 4 _ the base of the median vein nearly to the pos- 



terior angle, where it becomes slightly forked ; from this proceeds a 

 slightly curved narrower branch, from the centre of the wing nearly to the 

 costal edge, and one-third the distance from the apex : a zigzag mark 

 composed of three straight lines, the first being the broadest, and the third 

 one-half the length of the others, proceeds from the outer angle, where it 

 joins the first line, and terminates under the costal edge; the whole forming 

 a distinct W crossed at the top by the transverse band. Inner edge faintly 

 marked with creamy white. 



Posterior wings dull red, marked with dark brown spot-. Inner edge 

 yellowish ; costa and outer edge with a dark border, formed by confluent 

 spots, narrowest at the middle third, the spot at the posterior angle more 

 prominent, and triangular in shape ; a large heart-shaped spot occupies 

 the centre of the outer third of the wing, nearly touching the outer edge, 

 and is surrounded by four smaller spots, the one near the inner margin 

 wedge-shaped and extending to the base of the wing. Fringes dirty 

 yellow. Alar, expanse 1-15 inch. 



Antennas brown. Head creamy white above, brownish around the 

 eyes. Thorax brown with lateral lines of creamy white ; shoulder tippets 

 edged with same colour. Body beneath uniform light brown ; above, 

 darker, with two broad red lateral stripes which become yellowish at the 

 tip. Habitat. — Colorado Territory. 



This beautiful little species is dedicated to Mr. Henry T. Williams, of 

 the " Horticulturist," to whom I am indebted, more than to any other 

 person, for my summer's ramble through the Rocky Mountains. 



The accompanying figure, though not quite correct in detail, will give 

 an idea of the markings by which this moth is characterized. On the 

 anterior wing, the upper fork of the line running from the base, is too 

 heavy, and too long, giving the appearance of four zig-zag marks when 

 there are but three, while the spots on the hind wings, though correctly 

 placed, are not in every instance exactly of the right shape. 



