88 LORD WALSINGIIAM ON NEW TINElDjE. [Feb. 17, 



pale ochreous. Abdomen brigbt orange-ochreous, except at the 

 extreme base, which is blackish. First and second pair of legs, 

 together with the underside of the wings, dark smoky grey ; the 

 first pair with indistinct pale spots at the joints ; third pair bright 

 orange-ochreous ; the tarsi with blackish annulations. 



Expanse 25 millims. 



S . Taken on the Siskiyou range of mountains on the borders of 

 California and Oregon, June 10th, 1872. Allied to the European 

 Psecadia chrysopyga (Zell.), and approaching in appearance Ane- 

 sychia cirrhocnemia, Led., Horse Ent. Soc. Ross. viii. p. 25, pi. ii. 

 fig. 8. 



Psecadia arctostaphylella, sp. nov. (Plate XII. fig. 4.) 



Capite subcaruleo-albo, antennis, excepta lasi supra albida, fuscis ; 

 thorace sexpunctato ; alls anticis subcceruleo-albis, minus apud 

 costam, prcecipue apud cellulam squamis fumosis adumbratis ; 

 punctis marginalibus nigrescentibus undecim; posticis subflave- 

 scenti-griseis ; abdomine ocAraceo, tibiis posticis ochraceis, tarsis 

 nigra annulatis. 

 Head bluish white ; antennae fuscous, with some white scales above 

 at the base ; palpi bluish white, shaded on their outer sides with 

 blackish scales. Thorax bluish white, with six black spots, three on 

 each side, and a few black scales forming an indistinct spot at the 

 back of the head. Fore wings bluish white ; the costal half is much 

 occupied by smoky blackish scales, which form a strong shade along 

 the middle of the wing from the base to the end of the cell, and a slight 

 shade projecting downwards beyond it ; the dorsal half is of the 

 plain bluish white ground-colour, into which the median shade 

 gives out a slight projection about the middle of the wing, and a 

 small semi-detached spot pointing inwards nearer to the base ; 

 along the apical margin are ranged eight or nine blackish spots, 

 with two or three more indistinct ones along the costa near the 

 apex ; cilia greyish. Hind wings grey with a slight yellowish 

 tinge ; cilia yellowish, es])ecially at the abdominal margin. Abdo- 

 men yellow, shaded with greyish at the base. First and second pairs 

 of legs blackish, the tarsi with white annulations; third pair of 

 legs yellow, the tarsi with blackish annulations. 

 Expanse 22 millims. 



This species is nearly allied to P., bipunctella (Fab.), but it differs 

 in the bluish white, not pure white, ground-colour of the fore wings, 

 and in the less intense black and somewhat different form of their 

 shaded portion, which is much paler towards the costa than in that 

 species, differing also in this respect from Anesychia Tiagenetla 

 (Cham.), as well as in its larger size. 



I met with the species above described in Mendocino and Lake 

 counties, California, in the middle of June 1871, and bred one spe- 

 cimen on the ISth of June from a pupa found near San Francisco 

 on the 20th of May, in a a delicate cocoon in a leaf of ]\Iauzanita 

 (^Arctostaphylos ylauca, Lindl.), which the imago frequents. 



