86 



TTNITED STATES NATIONAL MUSEUM BULLETIN 207 



partially divided towards apex and with a projecting 

 arm from its base supporting a heavy hair tuft. Anellus 

 a rather narrow band with short, stubby, lateral arms. 

 Aedeagus somewhat curved and with a slightly more 

 sclerotized bulge from outer third; penis with a few 

 minute scobinations or some fine sclerotized wrinkles, 

 otherwise unarmed. Vinculum elongate (considerably 

 longer than greatest width), U-shaped, sclerotized only 

 (and narrowly) along its margins, arched dorsaUy (like 

 a bent hairpin) . 



Female genitalia with signum; ductus bursae and 

 genital opening simple; ductus seminalis from bursa 

 near junction of bursa and ductus bursae. 



This genus is uncomfortably close to the genus fol- 

 lowing (Megarthria), from which it differs chiefly in 

 the closer approximation of vein 2 of hind wing to the 

 lower outer angle of cell, the decided stalking of 3 with 

 4-5, and the slightly longer cell. The male antennal 

 character on which Eagonot and Dyar erected then- 

 genera is probably here (as in Megarthria) of specific 

 rather than generic significance. 



178. Ceracanthia mamella (Dyar), new comhination 

 Figures 13, 272, 278, 757 

 Procandiopa mamella Dyar, Ins. Insc. Menstr., vol. 7, p. 51, 1919, 



Forewing yellowish white along costa; remainder of 

 wing a purplish shade with a scattered peppering of 

 blackish scales especially along base of median fold; 

 antemedial line obscure, far out on wing and outwardly 

 angled in cell, indicated chiefly by a discontinuous, nar- 

 row, blackish outer bordering line; subterminal line 

 somewhat more distinct, sinuate, yellowish white, fol- 

 lowed on costa by a short blackish dash and bordered 

 inwardly by a black line which expands into patch at 

 middle; discal dots blackish; terminal dots confluent 

 forming a blackish line along the outer margin. Hind 

 wing pale smoky brown; the veins faintly darkened and 

 a distinctly smoky shade along termen. Alar expanse, 

 15-16 mm. 



Male genitalia with outer margin of harpe evenly 

 rounded. Female genitalia with signmn a flat, some- 

 what granulate plate, bearing a short thorn near its 

 center. 



Ttpe locality: Kfo Trinidad, Panamd (type in 

 USNM). 



Food plant: Unknown. 



Distribution: PanamA: Kio Trinidad (Mar., May). 

 Guatemala: Cayuga (May). 



Represented only by the original type series, a male 

 and female from the type locality and a male and female 

 from Guatemala. 



The sinus in the male antenna (fig. 278) appears 

 smoothly scaled to the naked eye but xmder magnifica- 

 tion shows several minute, erect, papillalike scales, simi- 

 lar to those on Megarthria peterseni but less conspicuous. 



179. Ceracanthia vepreculella Ragonot 

 FiQUEE 273 

 CercxarUhia vepreculella Ragonot, Monograph, pt. 1, p. 230, 1893. 

 I have seen no examples of this species but from 



Ragonot's description and figure it appears to be similar 

 to mamella except that the general color is a more uni- 

 form yellowish gray without the contrastingly paler 

 costa and the purplish shade on the remainder of the 

 wing, characteristic of mamella. It is also a larger 

 species. Alar expanse, 23 mm. 



Male genitalia with outer margin of harpe angulate. 



Type locality: Loja, Ecuador (type in Paris Mus.). 



Food plant: Unknown. 



45. Genus Megarthria Ragonot 



Megarthria Ragonot, Monograph, pt. 1, p. 156, 1893. (Type of 

 genus: Myelois peterseni Zeller.) 



Characters similar to those of Ceracanthia except: 

 Vein 2 of hind wing fiu:ther removed from lower outer 

 angle of cell; the cell itself shorter, less than one-third 

 the length of wing; vein 3 connate with the stalk of 4-5 

 or contiguous with it for a short distance from the angle 

 of cell, but not from the stalk; eighth abdominal seg- 

 ment of male with sternite developed usually as a 

 laterally flattened, more or less bent, digitate pocket, 

 the supporting lateral arms of the sternite bearing a 

 pair of scale tufts. 



Male genitalia with anellus an elongate shield; trans- 

 tilla absent (except in schausi) . 



Female genitalia with or without signum; ductus 

 seminalis from bursa adjacent to junction of bursa and 

 ductus bursae. 



The shaft of the male antenna has a rather broad 

 sinus at base (as in Ceracanthia) but is specifically vari- 

 able. The lower outer angle of cell in the hind wing is 

 as far out as in Ceracanthia, but the discocellular vein 

 curves inward more deeply, making the cell itself appre- 

 ciably shorter than that of Ceracanthia. 



In the National Collection all the specimens except 

 the male type of cervicalis Dyar had been identified as 

 peterseni Zeller. They are strikingly similar in color 

 and maculation, but their structures show that foiur 

 species are present among the males and at least two 

 among the females. With our present knowledge the 

 sexes cannot be associated with any certainty; so untU 

 something is known of their host association and the 

 species are reared it seems a safer procedure to anticipate 

 later synonjony and give separate names to the males 

 and females rather than to link the females nomencla- 

 torUy to any of the male types. 



180. Megarthria peterseni (Zeller) 

 FiGUKES 14, 274, 279 



Myelois peterseni Zeller, Horae' Soc. Ent. Rossi cae, vol. 16, p. 



198, 1881. , 



Megarthria peterseni (Zeller) Ragonot, Monograph, pt. 1, p. 157, 



1893. 



Ground color of forewing white on costal half of wing, 

 olivaceous brown on lower half, this brown shade 

 extendiog upward to costa at extreme base and obliquely 

 upward from lower outer angle of cell to costa at apex; 

 an obhque blackish brown band from costa at about 

 one-third extends to the paler brown ground color on 



