350 AMERICAN MICRO- LEPIDOPTERA. 



grindeliella Wlsm., which is also sometimes an upperside miner. The 

 loosened epidermis is very much wrinkled longitudinally at maturity. 



The species of this subgenus pupate in an elongate, dense, white 

 cocoon (Plate XX, Fig. 13), sometimes ornamented with longitudi- 

 nal ridges. This cocoon is suspended inside the mine by two slightly 

 diverging silken threads at the posterior end, and by either one or 

 two threads at the anterior end. 



The markings of the forewings consist of a more or less distinctly 

 developed basal streak ; four white costal streaks, and two or three 

 dorsal streaks. There may be one or two more or less distinctly 

 angulated fasciae, formed by the confluence of opposite streaks. 



The species herein included represent a more ancestral type, more 

 nearly related to the Gracilaria group of genera. 



One species, solidaginis Frey and Boll, is found from the Atlantic 

 to the Pacific ; the other species have a more limited range. 



The species may be separated by the following table : 



A. Basal streak distinct, reaching almost to or beyond the basal fourth. 



B. With an angulated fascia at one-fourth grindeliella. 



BB. Without a fascia at one-fourth. 



C. Basal streak narrow, pointed, unmargined solidaginis. 



CC. Basal streak much dilated posteriorly ainbrosiella. 



AA. Basal streak minute or wanting. 



B. Markings with a brilliant silver lustre; costal and dorsal streaks at three- 

 fourths never confluent ignota. 



BB. Markings not so brilliant; an angulated fascia at three-fourths. 



verbesinella. 



Cremastobombycia grindeliella Walsingham. 



Plate XXIV, Figs. 16, 22. 



Lithocolletis grindeliella Walsingham, Ins. Life, iii, 327, 1891. Dyar, Bull. 52, U. 

 S. Nat. Mus., 1902, No. 6299. 



"Antenna dull gray, with slightly paler annulations. Palpi grayish. Crown 

 tufted with mixed iron gray and reddish brown scales ; face grayish. Thorax 

 ferruginous. 



" Forewings pale ferruginous, dusted with iron gray and clouded with black- 

 ish scales beyond the middle of the wing to the apex ; three whitish costal streaks, 

 very indistinct, at about equal distances apart, the first and second of which are 

 outwardly oblique and are met at a somewhat acute angle on the middle of the 

 wing by two even less distinct dorsal streaks, faintly dark margined externally ; 

 the third is a mere spot, opposite which is a small spot at the base of the cilia at 

 the anal angle; immediately preceding the apex is a conspicuous curved white 

 costal spot divided from a smaller and less conspicuous one below it by the 

 cloudy streak of black scales which runs to the apex ; cilia with a ferruginous 

 tinge, becoming gray at and within the anal angle, and having a few black scales 

 below the apex. 



