Cerasmatrichia blahniki Harris and Armitage, new species

Fig. 6

Diagnosis. Cerasmatrichia blahniki is very similar to C. wirthi (Flint) from Dominica and Venezuela, as well as C. adunca (Flint) from Colombia in the overall appearance of the male genitalia. The new species is most easily separated by the presence of a large sternal process from abdominal segment VII, which is absent in the two closely related species.

Male. Length 2.3–2.8 mm. Antenna pale with 37 segments, scape round about twice length and thickness of 2 nd segment. Maxillary palpus with 3 rd segment darkened and bearing specialized setae. Legs tan in alcohol, foretibia spine reduced. Wings unmodified and dark brown in alcohol. Abdominal segment VII annular, with prominent ventromesal process. Segment VIII with deep mesal incision, cluster of stout spines posteroventrally; in ventral and dorsal views annular with mesal notch posteriorly on sternum, cluster of stout setae laterally. Segment IX thin, narrowing anteriorly and dorsally; ventrally reduced posteriorly anteriorly deeply incised; dorsum a narrow shelf. Segment X shelf-like, tapering distally to upturned, acute process; tergum divided into pair of elongate lobes, tapering apically, with numerous folds basally. Inferior appendage in lateral view narrow, turning ventrad, distally narrowing to sharp apex, basally with oval, setose lobe; ventrally narrow over length, apex curving inward to acute point, basal lobes narrow and diverging. Subgenital plate in lateral view shorter than inferior appendages, downturned apically to sharp point, subapical ventral notch; triangular in ventral view with mesal notch. Phallus with tubular basal portion, apical portion cylindrical with narrow curving internal rod (ejaculatory duct), dorsally with apical portion divided at midlength, ejaculatory duct protruding mesally.

Female. Unknown.

Type material. Holotype, male— Panama, Bocas del Toro Province, Quebrada Rambala, near Rambala Jungle Lodge, 3.74 km SSE Rambala, 8.91627°N and 82.15469°W, 120 m, Malaise trap, March 28, 2015, E. Carlson. Paratypes. ibid., March 31–April 11, 2015, 1 male, ibid., February 6–12, 2017, 1 male; ibid., December 21–31, 2016, 4 males; tributary of Quebrada Rambala, Rambala Jungle Lodge, 3.7 km SSE Rambala, 8.91627°N and 82.15469°W, 134 m, November 29, 2014, E. Carlson, 1 male (SCH).

Etymology. We take great pleasure in naming this species for our colleague Dr. Roger Blahnik for his friendship and professional expertise in verifying adult Trichoptera from Panama, and for his dedication to Trichoptera systematics in the Neotropics and beyond.