26o ENTOMOLOGICAL NEWS [Nov., '19 



Notes on Cosmopterygidae, with Descriptions of new 

 Genera and Species (MicroIepidoptera)» 



By Annette F. Braun, Cincinnati, Ohio. 



Cosmopteryx opulenta n. sp. 



Palpi white, outer and inner surfaces each marked with a black 

 longitudinal line. Antennae grayish brown, becoming darker towards 

 apex ; with a conspicuous white line on anterior surface near base ; 

 last segment black, or sometimes merely black-tipped ; next three pre- 

 ceding segments white ; next three segments black, followed by a 

 white, then a black, then a white segment. Head and thorax grayish 

 brown, with three longitudinal white lines. 



Fore wings brownish gray, or seal brown, with the basal half 

 marked with five fine white longitudinal lines ; one starting from base 

 just Y/ithin the costal edge diverges from the costa outwardly, ex- 

 tending about two-thirds through the basal brown area ; a second 

 extends along the extreme costa from the basal fourth almost or quite 

 to the yellow fascia, becoming broader outwardly ; a third along 

 middle of wing from base to a little beyond the costo-basal streak: 

 a fourth shorter streak below fold not attaining the base ; a fifth 

 white streak dorso-basal. Just beyond middle of wing, a yellow 

 fascia. Four patches of metallic scales ; the costal one of the inner 

 pair limits the fascia inwardly, not touching the costa, and has a few 

 black scales on its outer margin ; dorsal patch placed farther back 

 and with black scales on its inner margin ; the yellow fascia extends 

 between them and borders the inner side of the dorsal patch, some- 

 times almost to dorsal margin. Posterior pair of metallic patches 

 almost opposite, attaining the margins, and limiting the yellow fascia 

 outwardly, except in the middle of the wing where the fascia extends 

 between and a httle beyond them. Costal cilia immediately following 

 the second costal metallic patch white ; occasionally the yellow of the 

 fascia is almost confluent with this white patch. Remainder of apical 

 portion of wing and cilia of the basal brown ground color, except 

 for a long white line extending from just beyond the yellow fascia to 

 the tips of the apical cilia. Hind wings and cilia concolorous with 

 fore wings. Legs gray streaked and banded with white. 



Expanse : 9.5-10.5 mm. 



Locality: Rivera, Los Angeles County, California. 



Type and paratypes in writer's collection. 



Nine specimens bred from irres^iilar mines on Ambrosia 

 psylostachya. The mines extend principally along the midrib, 

 with irregular projections branching out on either side. The 

 larva spins a cocoon on the densely pubescent under side of 

 the leaf, constructed of silk, and the whitish pubescence of the 

 leaf. Mines collected in October; imagoes in April of the 

 following year. 



This species is apparently intermediate between C. delica- 

 tcUa Wlsm. and C. quadrilincclla Cham. ; the additional white 

 streak along the second fourth of costa distinguishes it from 

 both. 



