Rhyacopsyche mutisi Mey & Joost

Fig. 21

Rhyacopsyche mutisi Mey and Joost, 1990:134 [Type locality: Colombia, Dept. Tolima, Mariquita, Rio Medina; ZMHU; male, larva, case].

The third species in the turrialbae group, it is most closely related to R. turrialbae . The inferior appendage and the truncate dorsolateral lobe of segment IX are very similar. Rhyacopsyche mutisi is diagnosed by the very long posteroventral process of segment IX, the medially directed ventral lobe of the inferior appendage, and the absence of peglike setae on the dorsolateral lobe. Additionally, the intermediate appendage has a diverging, lanceolate basal process.

Adult (male n=1). Color in alcohol, brown.

Male genitalia. Abdominal segment IX sparsely setose, anterior margin slightly rounded; sternum IX, in lateral view, with posterior margin lanceolate; posterior margin slightly inflated midlaterally; dorsolateral lobe of segment IX slightly produced, in dorsal view trianguloid, shallowly divided, meeting dorsally, apex bearing several thin setae. Tergum X partially retracted inside segment IX. Intermediate appendage produced into dorsal and ventral pair, the dorsal appendage twisted and ventrally directed, the ventral pointed and laterally directed. Inferior appendage tall, divided into dorsal and ventral lobes, the ventral lobe bearing several thin setae, the dorsal lobe with 2 fingerlike processes, the more dorsal bearing 1 large pointed seta. Phallus linear, membranous sheath absent; central tubule with apex truncate; apex of lateral process rounded.

Material examined. COLOMBIA: Mariquita, Rio Medina, 3.xii.1987, W Joost — 1 pharate adult male, 2 pupae (paratypes, ZMHU).

Distribution. Colombia.