12 ZYGCENID.E AND BOMBYCID^ 



Judging from Kirby's figure, the costa of the anterior wings in our 

 species is more excavated; apex, more produced and rounded; the 

 tegulae are black, not white, as are also the orbits of the eyes. Mr. 

 Walker's description contradicts Kirby's in giving the middle tibiae 

 only orange tufts, a character I have given to the present species with 

 some hesitation, the legs in the single specimen I have being imper- 

 fect, while Kirby describes A. Maccullochii as having orange tufts on 

 anterior, and middle tibiae like A. Octomaculta. " 



From A. Lorquinii and A. Similis it may be readily distinguished 

 by the black patagia, and the shape of the outer spot on the primaries. 

 In the two former species, this is ovate, or sub- linear, while in A. Rid- 

 ingsii the spot increases in width Irom the costa towards the inner 

 angle, where it is abruptly truncate; and its inner margin is irregularly 

 concave, owing to the varying length of the segments of which it is 

 composed. 



Mr. Grote's description of the legs is correct, the middle pair only 

 being ornamented with orange scales. The female from which my 

 figure is drawn, differs in no wise from Mr. Grote's description and 

 figure, except in the larger size of the disca! dot on the anterior wings, 

 a peculiarity also common to the females of A. Lorquinii and A. Sim- 

 ilis, This species was named by Mr. Grote, after Mr. James Ridings, 

 whose labors, in Colorado and elsewhere, have greatly added to our 

 knowledge of North American Lepidoptera. The type was collected 

 in Colorado Territory by Mr. Ridings; and its subsequent occurrence 

 in the vicinity of San Francisco, California, and at Virginia City, 

 Nevada, is interesting, as indicative of the wide range of many species 

 west of the Rocky Mountains, not found to the eastward of that range. 

 A. Lorquinii, and Coloradia Pandora, Blake, are other instances, and 

 when the high Sierras of California have been thoroughly explored, 

 we shall probably find a yet greater similarity in their faunas. 



6.-ALYPIA LORQUINII (PI. i, Fig. i.) 



Alypia Lorqiimii, Grote, Trans. Am. Ent. Soc. Vol. i., p. 328. (Plate 



6, Fig. 39, 3.) (1868.) 



Agarista Lorquinii, Boisd., Ann. Soc. Ent. Belq. Vol. 12, p. 69. 



(1868-9.) 



" 5 . — Allied to the Canadian A. Maccullochii and to A. Ridingsii 



from Colorado Territory. Black. Head, black ; eyes prominently 



margined behind with sulphur yellow ; labial palpi roughly scaled, 



black, prominently exceeding the front ; maxillae blackish ; antennas 



