10 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 119 



Museum, Pittsburgh, Pa. One female paratype, Costa Rica, Never- 

 mann in the Zoologische Sammlung des Bayerischen Staates, Munich, 

 Germany. 



Distribution: Known only from Costa Rica. 



Remarks: At the beginning of this study I thought the three fe- 

 male examples in the U.S. National Museum probably represented 

 a dark form of e;ffusa in which there was a greater development of 

 the dark marginal band of the hindwing. This seemed to be a reason- 

 able conclusion because other species of the genus, especially those 

 of the splendens complex, do show considerable variation in the de- 

 gree of development of the dark marginal band of the hindwings. 

 However, when males became available for study, constant differences, 

 even if slight, were found to exist m the genitalic characters and other 

 differences in maculation were recognized. The broad sacculus of 

 the left valve, the differently directed apical process of the left sac- 

 culus, the shorter costal spine of the right sacculus of the male 

 genitalia, the differences in the sclerotized parts of the female geni- 

 talia, the heavy dark markings of the forewing, the presence of blue 

 white patches of scales in cells Cui and Cu2 of the forewing, and the 

 dark fringe of the hindwing (yellow in efusa) convinced me that 

 this entity should be considered to be a species distinct from effusa. 



The known localities for the species are both from the Caribbean 

 side of Costa Rica. It is possible, therefore, that this species is 

 geographically isolated from ejffusa, which may occur on the Pacific 

 side of Costa Rica. Proof of the correctness of this supposition must 

 of necessity depend on further collections of material from that 

 country. 



Eusceptis irretita Hiibner 



Figures 1, 19 



Eusceptis irretita Hiibner, 1823, Zutrage zur Sammlung exotischer Schmettlinge 

 [sic], Zweites Hundert, p. 21, figs. 305, 306. 



Eugraphia irretita (Hiibner). — Gu6n6e, 1852, Histoire naturelle des insectes: 

 Species general des l^pidoptferes, vol. 6 (Noctuelites, II), p. 208. — Walker, 

 1857, List of the specimens of lepidopterous insects in the collection of the 

 British Museum, pt. 12, p. 776. — Druce, 1889, in Godman and Salvin, 

 Biologia Centrali- Americana, Insecta, Lepidoptera, Heterocera, vol. 1, p. 

 304. — Hampson, 1910, Catalogue of the Lepidoptera Phalaenae in the 

 British Museum, vol. 10, p. 793, fig. 211.— Strand, 1913, Arch. Naturg., 

 vol. 79 (A), nos. 7-9, p. 62.— Hemming, 1937, "Hiibner," vol. 2, p. 198.— 

 Draudt, 1939, in Seitz, Gross-Schmetterlinge der Erde, vol. 7, p. 397. 



Noctua melanogramma Perty, 1833, Delectus animalium articulatorum quae in 

 itinere per Brasiliam . . ., p. 163, pi. 32, fig. 10.— Walker, 1857, List of the 

 specimens of lepidopterous insects in the collection of the British Museum, 

 pt. 12, p. 776 [as a synonym of irretita Hiibner]. 



