Abstract
Rivula stepheni sp. n. (Noctuidae, Rivulinae) is described from material collected in North Carolina and Louisiana. Illustrations of genitalia and adults of Rivula found in the United States are provided. The generic placement within the Noctuoidea is discussed.
Highlights
The genus Rivula Guenée currently is represented in the United States by two species
In the forewing the reniform spot appears as two distinct dots. This is overlaid with black scaling in many R. propinqualis (Fig. 2) and R. sericealis
In Oxycilla Grote (Boletobiinae), a possible sister group, twinned spots are visible in O. mitographa (Grote) and O. ondo (Barnes) but not in the other three species currently placed in the genus
Summary
The genus Rivula Guenée currently is represented in the United States by two species. Rivula pusilla Möschler, 1890 (Fig. 1) is found in Florida and Texas (Heppner 2003). Rivula propinquinalis Guenée, 1854 (Fig. 2) is distributed throughout eastern North America from southern Canada southward to Florida and Texas and westward in the north to British Columbia and Washington. During 1995 I collected a single specimen of what appeared to be an undescribed species of Rivula. Enough specimens were collected to access its variation and describe the species.
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