140 



UNITED STATES NATIONAL MUSEUM BULLETIN 207 



Female genitalia with bursa small, covered with 

 dense slender spines on posterior half, otherwise very 

 finely spinose, without signum; ductus bursae granu- 

 late, short, expanded into a broad, strongly sclerotized, 

 contorted plate towards genital opening; ductus semi- 

 nalis from lobe of bursa near junction of bursa and 

 ductus bursae. 



The genus is a further restriction from Nephopteryx 

 of authors. Its nearest relationship seems to be Pyla, 

 which it resembles in the peculiar modification of the 

 ductus bursae of the female and the aedeagus of the 

 male. Its venation, however, is quite distinct and, 

 except for the strong anastomosis of veins 7 and 8 of 

 hind :wing, closer to that of Tacoma. 



284. Actrix nyssaecolella (Dyar), new combination 

 FiGUEES 357, 838 

 Tacoma nyssaecolella Dyar, Proc. Ent. Soc. Washington vol. 6, 

 p. 112, 1904.— Forbes, Cornell Mem. 68, p. 621, 1923.— 

 Craighead, U. S. Dep. Agr. Misc. Publ. 657, p. 453, 1950. 

 Nephopteryx nyssaecolella (Dyar) Barnes and McDunnough, 

 Contributions, vol. 3, p. 196, 1916. — McDunnough, Check 

 list, No. 6174, 1939. 



Forewing brownish gray ("lUaceous gray") paler in 

 basal area beyond extreme base, in the half of median 

 area just beyond antemedial line, and to a lesser extent 

 in outer area (beyond the subterminal line), these pale 

 areas of an ashy hue, due to a faint peppering of white 

 scales; antemedial line narrow, obKque and very slightly 

 angled at middle, dull white, preceded on inner margin 

 by a subquadrate blackish brown patch and bordered 

 outwardly at costa by a triangulate black patch which 

 (on most specimens) continues as a more or less inter- 

 rupted black line to inner margin; subterminal line 

 sinuate (bulged at middle) and weakly serrate, dull 

 white, bordered inwardly by a dark shade and outwardly 

 by a narrower dark line, these dark borders especially 

 marked and blackish at costa; discal dots confluent, 

 blackish; a row of more or less confluent black dots 

 along termen. Hind wing pale smoky brown, with a 

 glossy sheen; veins very faintly darkened; a narrow 

 brown line along termen. Alar expanse, 15-18 mm. 



Male genitalia with terminal margin of uncus con- 

 cave, its lateral lobes tiu-ned laterally outward. Apical 

 process of gnathos a convex shield, slightly longer than 

 broad and with apical, lateral angles produced backward 

 into bluntly pointed spines. Divided elements of aedea- 

 gus produced as short, sharply and oppositely curved 

 hooks. CucuUus of harpe sharply curved towards its 

 apex. Female genitalia distinguished at once by the 

 shape of the ventral sclerotized plate of ductus bursae 

 and the eighth-segment collar, which is complete and 

 strongly sclerotized ventrally. 



Type locality: Washington, D. C. (type in USNM). 



Food plant: Nyssa sylvatica (larva a leaf-folder). 



Distkibution: Massachusetts, Nantucket (July); 

 Connecticut, East River (July, Aug.); Rhode Island, 

 Weekapaugh (July) ; New Jersey, Anglesea (May, June) ; 

 Pennsylvania, New Brighton (July, Aug.), Oak Station 

 (Aug.) ; District of Columbia, Washington (Aug.) ; North 

 Carolina, Southern Pines (Aug.), Tryon (Aug.). 



285. Actrix diBsimuIatrix, new species 

 Figures 358, 837 



Superficially not distinguishable from nyssaecolella 

 except (on the specimens before me) a slightly stronger 

 white dusting on median area of forewing especially 

 over iimer margin immediately following the antemedial 

 line. This difference can hardly be expected to hold 

 for the species. 



The genitalia of both sexes are very different from 

 those of nyssaecolella. Male genitalia with terminal 

 margin of uncus evenly roimded, its lateral lobes turned 

 inward and downward, partially encircling the anal 

 tube. Apical process of gnathos heart shaped, without 

 produced angles. Divided elements of aedeagus pro- 

 duced as long, straight, stout thornlike projections, one 

 of which is coarsely scobinate. Female genitalia with 

 a stout pair of strongly sclerotized, curved, lateral arms 

 projecting forward from the ventral sclerotized plate 

 of the ductus bursae. 



Type locality: Cape Henry, Va. (type in USNM, 

 61349). 



Food plant: Nyssa sylvatica. 



Described from male type and two male and one 

 female parat3T)es from the type locality, reared by A. 

 Busck, Aug. 10, 16 and 18, 1927, from larvae feeding on 

 the leaves of Nyssa sylvatica. Fom- larvae were pre- 

 served from the collection. Three of these are blackish 

 brown in color and are undoubtedly nyssaecolella. One 

 larva is yellow with a pale yellowish head and thoracic 

 shield. It is probably dissimvlatrix. No difference was 

 noted in larval habits between the two forms. 



75. Genus Stylopalpia Hampson 



Stylopalpia Hampson, Ann. Mag. Nat. Hist., ser. 7, vol. 7, 

 p. 257, 1901. (Type of genus: Stylopalpia lunigerella 

 Hampson.) 



Tongue well developed. Antenna very shortly pubes- 

 cent, shaft of male somewhat flattened and with a 

 shallow sinus at base containing a row of short spines 

 more or less concealed by a small, weak scale tuft. 

 Labial palpus obliquely upturned; third segment very 

 long (nearly twice the length of second), slender and 

 porrect in lunigerella, much shorter (about half the 

 length of second) and oblique in the other two species, 

 in these reaching a little above vertex, acuminate in all 

 species. Maxillary palpus minute, its scaling slightly 

 expanded. Forewing smooth; 11 veins; vein 2 from 

 before the lower outer angle of cell; 3 from the angle; 

 4 and 5 separated at base and divergent beyond, 4 but 

 slightly nearer to 5 at base than to 3 ; 6 from below upper 

 angle of cell, straight; 8 and 9 stalked for slightly more 

 than half their lengths; 10 from the cell, well separated 

 from the stalk of 8-9 at base but just beyond approach- 

 ing it for a very short distance; male without costal 

 fold. Hind wing with vein 2 from well before lower 

 outer angle of cell; 3 from the angle; 4 and 5 stalked 

 for about half their lengths; 7 and 8 approximate or 

 contiguous for a very short distance beyond cell; cell 

 less than half the length of wing; discocellular vein 



