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Noctuidae - Psaphidinae - Triocnemidini
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Oxycnemis advena Grote 1882
Diagnosis: Oxycnemis advena is a black gray species most likely to be confused with Oxycnemis new species 1. Unlike Oxycnemis new species 1, however, there is usually a distinct whitish patch between the orbicular spot and the reniform spot absent in new species 1. There is normally also a black patch connecting the claviform spot to the postmedial line. The antemedial line in advena is obliquely straight with at most a small tooth medially, but in Oxycnemis new species 1 there is most often a large tooth in the middle of the antemedial line projecting into the claviform spot. The color is different. Oxycnemis advena is black gray but Oxycnemis new species 1 is more of a steel gray color with a slightly blue tinge. Although there is considerable variation in size in both of these species, Oxycnemis new species 1 is on the average much larger than advena. The average forewing span of the male from base to apex is 8-9 mm in advena and 11-12 mm in Oxycnemis new species 1. The male genitalia are almost indistinguishable. However the clasper of the valve in advena is about one third to one half the distance from the base to the apex but is one fourth to one third the distance in Oxycnemis new species 1. The uncus of advena is shorter and wider in advena than in Oxycnemis new species 1. In particular the length of the uncus in advena is approximately three times as long as its widest part but in new species 1 is at least four times as long as wide. Dated specimens are all in July and August. Distribution: Oxycnemis advena is commonest in the mountains of southern Arizona. However it has also been collected in eastern Nevada, southern California, and southern Baja California in Mexico. I would expect it also in the state of Sonora although I have yet to see specimens from there. Males are smaller than females in forewing length from base to apex by about three millimeters. There is general variation in size in both sexes. The intensity of the white patch in the forewing between the orbicular spot and reniform spot varies from pronounced to almost absent as does the black patch between the claviform spot and postmedial line. The hindwing of the female is suffused more heavily with brown than in males. Identification Quality: Excellent Larva: Unknown Foodplants: Unknown
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Oxycnemis advena
Oxycnemis advena is a black gray species most likely to be confused with Oxycnemis new species 1. Unlike Oxycnemis new species 1, however, there is usually a distinct whitish patch between the orbicular spot and the reniform spot absent in Oxycnemis new species 1. There is normally also a black patch connecting the claviform spot to the postmedial line. The antemedial line in advena is obliquely straight with at most a small tooth medially, but in Oxycnemis new species 1 there is most often a large tooth in the middle of the antemedial line projecting into the claviform spot. The color is different. Oxycnemis advena is black gray but Oxycnemis new species 1 is more of a steel gray color with a slightly blue tinge. Although there is considerable variation in size in both of these species, Oxycnemis new species 1 is on the average much larger than advena. The average forewing span of the male from base to apex is 8-9 mm in advena and 11-12 mm in Oxycnemis new species 1. The male genitalia are almost indistinguishable. However the clasper of the valve in advena is about one third to one half the distance from the base to the apex but is one fourth to one third the distance in Oxycnemis new species 1. The uncus of advena is shorter and wider in advena than in Oxycnemis new species 1. In particular the length of the uncus in advena is approximately three times as long as its widest part but in Oxycnemis new species 1 is at least four times as long as wide. |
Similar Species
Oxycnemis new species 1 |
