148 



TXNITED STATES NATIONAL MUSEUM BULLETIN 207 



and outer areas. The color of both the fore and hind 

 wings is similar to that of aeneella and the two species 

 can only be safely distinguished by their genitalia. 

 Alar expanse, 23-29 mm. 



Male genitalia with an angulate, serrate and coarsely 

 spined projection from costal base of harpe; clasper out- 

 bent, strongly spined and more or less serrate. Aedea- 

 gus short, slightly bent at middle and with a single stout, 

 stubby spine projecting from one side (extent of indi- 

 vidual variation shown in figs. 378a, b). Female geni- 

 taUa with a weak sclerotization of the lobe of bursa 

 giving off the ductus seminaHs; ductus bursae with 

 ventral surface of cup-shaped area more strongly 

 sclerotized than that of aeneella and differently sculp- 

 tured. 



Type locality : Evanston, Wyo. (type in Paris Mus.) • 



Food plant: Unknown. 



Distbibution: United States: Colorado, Tennessee 

 Pass (July); Wyoming, Big Horn Mts. (July), 

 Evanston, Yellowstone Park (July, Aug.); Montana, 

 Bozeman (July), Glacier Park (June); Oregon, Wallowa 

 Mts. (Arnold Lake, July); Washington, Olympic Mts. 

 (Hurricane Ridge, June, July). Canada: Alberta, 

 Laggan (July). 



The Washington and Oregon specimens are consider- 

 ably darker than those from the other locaUties, the 

 specimens from Oregon having almost black hind wings 

 and blackish brown forewings. 



In his original description and in his Monograph 

 Ragonot gives "N. Y." as the type locaUty. This was 

 a misreading of the label of his type. The correction 

 was made by Barnes and McDunnough in the reference 

 cited above. 



303. Pyla metalicella HiJst 



Figures 377, 863 



Pyla metalicella Hulst, Canadian Ent., vol. 27, p. 64, 1895. — 

 McDunnough, Check list, No. 6236, 1939. 



Maxillary palpus of male in the form of a semiaigrette 

 (the hairs rather short). 



Appreciably lighter than aeneoviridella. The fore- 

 wing a unicolorous light bronzy brown with greenish 

 yellow iridescence; discal dots more or less distinct, 

 separated, blackish; no other markings. Average size 

 larger than that of aeneoviridella. Alar expanse, 25-32 

 mm. 



Male genitalia with a long, somewhat flattened, out- 

 wardly curved clasper on harpe (similar to that of 

 impostor, but proportionally longer) ; costa of harpe at 

 base simple. Aedeagus very shortly divided at apex; 

 a pair of very short, sharp, straight spines on ventral 

 surface near apex. 



Female genitalia with lobe of bittsa giving off ductus 

 seminalis weakly sclerotized; cuplike area of ductus 

 bursae, funnel shaped (triangulate) , strongly sclerotized 

 over its entire ventral surface and containing a broad, 

 centrally located, funnel-shaped fold. Individual vari- 

 ations in this fold are shown in figs. 863 and 863a. 



Type locality: Colorado (type in AMNH, ex 

 Rutgers) . 



Food plant: Unknown. 



Distribution: Colorado, Silverton (July, Aug.), and 

 two specimens with only the state locality; Utah, SUver 

 Lake (July). The Silverton locahty is represented in 

 the National Collection by 17 specimens. Also in the 

 National Collection is a female from Colorado (Bruce), 

 labeled "Pyla aeneella Hulst, Type," another of Hulst's 

 pseudotypes and possibly part of his original "type" 

 series of aeneella. The actual type of metalicella is a 

 male with only the state locality. Its genitalia agree 

 in every detail with those from Silverton specimens. 



304, Pyla fasciella Barnes and McDunnough 



FiGTTBES 379, 861 



Pyla fasciella Barnes and McDunnough, Canadian Ent., vol. 49, 

 p. 405, 1917.— McDunnough, Check list. No. 6244, 1939. 



Maxillary palpus of male minute, squamous. 



Forewing blue-black, some paler bluish iridescence 

 over basal area and (in strong light) a faint, brownish 

 iridescence in outer area; antemedial line represented 

 by a narrow oblique black band near, but before middle; 

 subterminal line a similar curved band well back from 

 and parallel with termen; the area between the two 

 black bands darker than remainder of wing, forming a 

 faint, broad, median, black fascia; discal dots obsolete. 

 Hind wings very dark brown, shiny. Alar expanse, 

 21-24 mm. 



Male genitalia without clasper on harpe; base of 

 costa of harpe produced into a knoblike projection, 

 finely spinose along margin. Aedeagus simple. A 

 single pair of ventrolateral hair tufts on eighth segment. 

 Female genitalia similar to those of rainierella except 

 that the paired plates of ductus bm-sae at genital open- 

 ing are narrower and differently shaped. 



Type locality: Mount Shasta, Calif, (type in 

 USNM). 



Food plant: Unknown. 



Known only from northern California. Represented 

 in the National Collection by the type series from 

 Mount Shasta, 7,000 ft., July — three males and two 

 females (not four males and two females as given in the 

 original description) ; and one male from Bartle, Cahf . 

 (June 14, 1939, Grace H. and John L. Sperry). In 

 their original description the authors give the expanse 

 as "24-31 mm." This is probably a printer's error, 

 for the largest specimen before me is a scant 24 mm. 



305. Pyla nigricula, new species 

 FlGTJBB 380 



Maxillary palpus of male minute, squamous. 



Superficially like fascieUa except: Transverse dark 

 lines of forewing obsolete, only the antemedial black 

 band very faintly indicated; no contrasted dark median 

 fascia; the entire median and outer areas a dark 

 purplish brown. Alar expanse, 26 mm. 



Male genitalia with uncus broader and squattier than 

 that oi jasciella. Projection from costal base of harpe 

 differently shaped, bluntly pointed; clasper developed 

 as a stout, smooth, curved, pointed hook. Aedeagus 

 simple. 



