Rhyacopsyche duplicispina Flint

Fig. 14

Rhyacopsyche duplicispina Flint, 1996a:91 [Type locality: Tobago, Bridge B1/5, 6.5 km N Roxborough; NMNH; male].

This species is similar to R. patulosa, new species, and R. yatay based on the very reduced dorsolateral lobe, the anteroventrally produced anterior margin of segment IX, and the complexity of the inferior appendage. While both R. duplicispina and R. yatay have a trilobate inferior appendage, the composition is quite different. Rhyacopsyche duplicispina bears only a single peglike seta and the lobes are fingerlike, unlike the more setose and spatulate lobes of R. yatay .

Adult (male: n=1). Forewing length 2.1 mm. Color in alcohol, brown. Sternum VII without apicomesal point.

Male genitalia. Abdominal segment IX with no apparent setae, anterior margin nearly straight, produced anteroventrally; sternum IX, in lateral view, with posterior margin slightly rounded, with connecting membrane to inferior appendage; posterior margin nearly straight; dorsolateral lobe of segment IX slightly produced, in dorsal view rounded, widely separated, apex bearing several thin setae. Tergum X elongate, with rounded, apicolateral lobes. Intermediate appendage not evident. Inferior appendage semierect, slender, with row of long setae, in ventral aspect, appendage produced into 3 lobes with center lobe bearing 1 large peglike seta. Phallus linear, membranous sheath absent; central tubule with forked apex; apex of lateral process lanceolate.

Material examined. TOBAGO: Bridge B1/5, 6.5 km N Roxborough, 390 m, 11°17’ N, 60°35’ W, 14.vi.1993, O S Flint & W N Mathis — 1 male (holotype, NMNH).

Distribution. Tobago.