■UNITED STATES NATIONAL MUSEUM BULLETIN 207 



185. Megarthria alpha, new species 



FiGUBE 760 



Female. Color and markings as in peterseni males. 

 Alar expanse, 17-26 mm. 



Genitalia with signum developed as a teardrop 

 shaped, finely granulate-scobinate, depressed patch: 

 ductus bursae shorter than bursa with a narrow scle- 

 rotized band near genital opening. Eighth-segment 

 collar with a thin apron projecting anteriorly (the 

 shape and size of this individually variable; identical 

 in no two specimens; compare figures 760a and 760b). 



Type locality: Volcdn Santa Marfa, Guatemala 

 (type in USNM, 61339). 



Food plant: Unltnown. 



Described from type (Sept.) and three para types 

 from the type locaUty (Schaus and Barnes, collectors, 

 July, Oct.) and one paratype from each of the following 

 localities: Purulhd, Guatemala (Schaus and Barnes, 

 July); Quirigud, Guatemala (Schaus and Barnes, Apr.), 

 Jalapa, M6xico (Schaus); Orizaba, M6xico (R. MuHer, 

 Mar. 13); Mount Pods, Costa Rica (Schaus, May); 

 Juan Vinas, Costa Rica (Schaus and Barnes, Jan.); Rio 

 Trinidad, Panama (A. Busck, Mar. 1912); Incachaca, 

 Cochabamba, BoHvia (J. Steinbach); Santa Catarina, 

 Brazil (F. Hoffmann, July 12, 1935). All females; 

 genitalic preparations made of aU specimens. 



I beheve that alpha wiU eventually prove to be the 

 female of peterseni but have no convincing evidence at 

 this time that it is so. 



186. Megarthria beta, new species 



FiGiJHB 759 



Superficially indistinguishable from alpha but with 

 quite different genitaha. Alar expanse, 17-23 mm. 



Bursa without trace of signum; ductus bm«ae much 

 longer than bursa, unsclerotized at genital opening ex- 

 cept for a narrow, very weakly sclerotized band on 

 lower margin; anterodorsal projection of eighth-segment 

 coUar shght. 



Type locality: Orizaba, Mexico (type in USNM, 

 61340). 



Food plant: Unknown. 



Described from type (Schaus Collector, no data) ; one 

 paratype from Jalapa, Mexico (Schaus, no data) ; three 

 paratypes from Cayuga, Guatemala (Schaus and 

 Barnes, Feb., May, Oct.); one paratype from San Jos6, 

 Costa Rica (H. Schmidt); two paratypes from Porto 

 Bello, Panama (A. Busck, May 1912); and one para- 

 type from Caparo, west-central Trinidad (F. Birch, no 

 data). All females; the paratypes from Trinidad and 

 Costa Rica in the Ja,nse Collection. 



46. Genus Drescoma Dyar 



Drescoma Dyar, Proc. U. S. Nat. Mus., vol. 47, p. 328, 1914. 

 (Type of genus: Drescoma cyrdipsa Dyar.) 



Tongue well developed. Antenna pubescent; basal 

 segment normal (not swollen or elongated); shaft of 

 male simple. Labial palpus upturned, reaching vertex; 



moderately slender, the second segment somewhat 

 broadly scaled ; third segment nearly as long as second, 

 acuminate. Maxillary palpus subsquamous (scaling 

 of second segment somewhat expanded); folded across 

 base of tongue. Forewing smooth; 11 veins; vein 2 

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

 about equidistant from 2 and 4; 4 and 5 slightly sepa- 

 rated at base, thence divergent; 6 from below (but near) 

 upper angle of ceU, straight; 8 and 9 long stalked; 10 

 from the cell approximate to the stalk of 8-9 for some 

 distance; male without costal fold but with a distinct 

 notch in costa beyond base. Hind wing with vein 2 

 from lower outer angle of cell; 3 apparently from the 

 stalk of 4-5, but actually contiguous or weakly anas- 

 tomosed with it for half its length; 4 and 5 stalked for 

 over half their lengths; 7-8 contiguous or partially 

 anastomosed beyond cell, the free parts of the veins 

 very long; cell very short, one-fifth the length of wing 

 or less; discoceUular vein oblique; on male upper vein 

 of ceU notched just beyond base and with some modi- 

 fied sex-scaling above and beyond the notch; also on 

 male a short fold on anal margin enclosing a hair pencil. 

 Eighth abdominal segment without tuft; sternite de- 

 veloped as a short sclerotized, digitate pocket. 



Male genitalia as in Megarthria except: Transtilla 

 present and in the form of a wide, very shallow U; 

 harpe with an appressed, clasperlike projection near 

 apex of sacculus; vinculum terminating in a strongly 

 sclerotized, sinuate, transverse bar. 



Female genitalia with signum developed as a long, 

 strong, curved hook; ductus bursae shorter than bursa; 

 genital opening simple; ductus seminalis from bm-sa 

 near junction of bursa and ductus bursae. 



A distinct genus closely related to Ceracanthia and 

 Megarthria and to Drescomopsis in group II; but easily 

 distinguished by the bent (notched) upper vein of cell 

 in the male hind wing, the very short hind wing cell 

 in both sexes, the notched forewing of the male, the 

 peculiarly developed transtilla and terminal margin of 

 vinculum. 



187. Drescoma cyrdipsa Dyar 

 Figures 15, 282, 758 

 Drescoma cyrdipsa Dyar, Proc. U. S. Nat. Mus., vol. 47, p. 328, 

 1914. 



Color and markings as in Megarthria peterseni except 

 for darker hind wings, especially those of the females 

 which are dark smoky fuscous. The average size is 

 also consistently smaller. 



Hind wing of male with notched projection of upper 

 vein of cell into the cell deep and wide; on underside of 

 wing a patch of semimetallic scales above the notch; 

 a black patch preceding it, and following it a line of 

 yeUow and black scales along the vein. 



Male genitalia with transtilla triangularly broadened 

 toward harpes; clasperlike projection from sacculus 

 rather broadly triangulate. Female genitalia with 

 bursa minutely granulate; coarser granulations in ductus 

 bursae at its junction with bursa. The long, strong, 

 thornlike cornutus may be a specific character also, 

 but is more probably generic. 



