The hairstreak butterfly fauna of Nicaragua has not been comprehensively updated since Godman and Salvin listed 71 species in the Biologia Centrali-Americana over a century ago. Based primarily on Eumaeini in the Anderson and Sullivan Collections (Smithsonian Institution), we treat 149 thecline species recorded from Nicaragua with their localities and months of capture. None are endemic to Nicaragua, but 15 species have the northern or southern limit of their known distribution in Nicaragua. We relate the distributions of these 15 species, many of which are figured, to the life zones and physical features of Nicaragua and adjoining countries. Those eumaeine names for which Nicaragua is a type locality are noted, and a few unresolved taxonomic problems among the Nicaraguan fauna are pointed out. We list another 73 hairstreak species that are recorded both to the northwest and southeast of Nicaragua, but not in Nicaragua. Finally, we present brief historical comments on the collectors of Nicaraguan hairstreaks.

The new genus Utah is described from moths collected in the San Rafael Reef area of eastern Utah and in Juab Co., western Utah near the Nevada border. The type species Utah sanrafaelensis is described. Adults and genitalia are illustrated.

Strymon solitario Grishin & Durden, new species is described from southwest Texas, USA. This serapio group species of Strymon is distinguished from its closest relatives by a combination of: (1) restricted areas of light scales basally from submarginal darker lunules on the ventral hindwing—with these light macules not reaching 1/3 of the distance between the lunules and postmedian orange band; (2) small oval well-separated orange macules in the postmedian ventral hindwing band; (3) the presence of postbasal orange macules on the ventral hindwing in some specimens; (4) limited to almost absent violet blue dorsal wing overscaling; (5) occasional orange overscaling on the dorsal forewing in females; (6) rounder wings, particularly in males; (7) not prominently developed areas of dark scales on leg tibiae in most specimens, and (S) arid, desert and rocky slopes habitat. Relationships with other Strymon species are discussed and life history data are presented and illustrated. Hechtia texensis (Bromeliaceae) is established as the larval foodplant in the Big Bend National Park area. Over 40 specimens and live individuals of the new species are illustrated to show the extent of wing pattern variation.