THE CANADIAN ENTOMOLOGIST 23 1 



white with slightly darker head and prothoracic shield ; at maturity 

 it turns to a bright vermilion orange colour. It spins a double 

 cocoon of very fine, white silk, broadly oval, with one end a little 

 more pointed, the inner cocoon more elongate than the outer. 



The larvae may be found in September; the exact time of 

 reaching maturity depends upon the time of spore production in 

 the ferns. Asplenium acrostichoides produces fertile fronds and 

 ripe spores a couple of weeks in advance of A. angustifolium. 

 Where both species of ferns occur together, full-grown larvse may 

 be collected on the former species when the larvae on the latter 

 have eaten but one or two sori on each side of the midrib. The 

 imagos emerge during the latter part of July and early August. 

 In repose the moth rests with the brightly coloured hind legs 

 raised above the body. 



Yponomeutid/E. 

 Argyresthia pallidella, n. sp. 



Palpi pale yellowish white, fuscous beneath. Face and head 

 yellowish white, tuft almost white, antennae grayish yellow, an- 

 nulate with dark brown. Thorax and fore wings pale shining 

 yellowish white; extreme costa in the basal fourth dark brown. 

 Cilia whitish. Hind wings very pale gray or concolorous with the 

 fore wings, cilia whitish. Legs whitish, tibiae and tarsi of the first 

 pair fuscous. Abdomen brownish yellow at base, gray behind 

 except tip, which is whitish yellow. 



Expanse 11 mm. 



Locality. — San Barnardino Mts., California, July 7. 



Type and paratype in author's collection. 



The specimens were collected amongst fir, which is perhaps 

 the food plant. This species is very similar to A. laricella Kearf, 

 the chief difTerence being the darker annulated antennae. 

 Swammerdamia cuprescens, n. sp. 



Head and face white; palpi white with fuscous under surface; 

 basal segment of antenna white, stalk dark fuscous, annulate with 

 pale gray. Thorax white, very sparsely sprinkled with pale gray 

 specks. General colour of the fore wing pale gray, due to gray- 

 tipped whitish scales, with the base of the wing somewhat darker 

 gray. There is a dark gray half-crescent-shaped mark situated 

 at the basal third of the dorsum, curving slightly outwards and 



