NO.1290. LARV.E OF MOTHS FROM COLORADO— DYAR. 397 



ACROBASIS BETULELLA Hulst. 



Larva. — Head round, black, coarsel}' shagreened, epistoma sordid 

 white. Body purplinh black, the segments coarsely 3-annulate, not 

 shining-. Tubercles small, black, corrugated radially, iv and v closi^ly 

 approximate, in line. Anal plate black; feet normal, setge rather long, 

 fine. 



Spinning a web among the leaves of birch and living in a cone made 

 of frass united Avith silk. Platte Canyon; imago July 1. 



PIONEA BELIALIS Druce. 



Larva. — Head small, flat, half retracted in joint 2, black, the sutures 

 pale. Cervical shield bisected into two quadrangular halves, distinctly 

 separate. Bod}^ nearly cylindrical, uniform, robust, incisures onl}' 

 slightly marked; anal plate brownish, feet normal. Pale yellow with 

 large, conspicuous, round, black tubercles; ia+ib, iia+iib, iv+v, iiia 

 present, large, situated above and before the spiracle, vii a single 

 brown-black tubercle, viii distinct on the legless segments. Crochets 

 of abdominal feet in a broad ellipse, narrowly broken outwardl3\ 

 Thoracic feet black, the abdominal ones like the body. Spiracles 

 small, black-rimmed. 



The larvse are leaf miners in an herbaceous, aromatic plant, Coleo- 

 sa)ith(is grandifimxi, growing in bunches in moist spots in the foothills. 

 1 found them in a gulch near the mouth of the Platte Canyon. The 

 mine forms a large brown blotch extending through to both epidermes 

 at the terminal part of a leaf, occupying three-fourths or more of the 

 surface. At maturity, the larva emerges and spins up a three-cornered 

 box in one of the soft, young leaves at the end of the shoot where it 

 pupates. This leaf becomes wrinkled with growth. 



Larva? found matured July 11, at which time there were only a few 

 left, most having pupated. The moths began to emerge at once. 



A Tachinid parasite, Isoglossa hastata Coquillet, was raised from the 

 larva?. 



A specimen of the moth was sent to Prof. C. H. Fernald, who 

 says that it should be referred to the genus Cyhalomia. He adds that 

 it reminds him in appearance of Titanlo JieUanthiales Murtfeldt, which 

 is also a leaf miner in the larval state. 



Family PTEROPHORTD.E. 



OXYPTILUS DELAWARICUS Zeller. 



Larva. — Head rounded, whitish. Body light green with a rather 

 broad white subdorsal stripe, containing a round creamy patch on 

 joints 6 and 7; feet normal, slender. Tubercles i and ii united, single 

 haired, the hair of i leaning forward, ii backward; tubercle iii single 

 haired, leaning forward, iv and v united, not strongly oblique; vi 



