3324 Author Namayandeh, Armin Author Bilyj, Bohdan Author Beresford, David V. Author Somers, Keith M. Author Dillon, Peter J. text Zootaxa 2012 2012-05-24 3324 1 65 journal article 1175­5334 Tribelos jucundum (Walker) Figs 47 A–E Diagnosis. Frontal apotome separated from S3 setae by straight suture ( Fig. 47A ); labrum and premandible as in Fig. 47B ; SI seta plumose; pectin epipharyngis with three toothed platelets; antenna ( Fig. 47C ) 5-segmented, last three strongly reduced, LO large enveloping segment 3, blade twice as long as flagellum, AR 1.3; mandible ( Fig. 47D ) with 3 inner teeth, their combined length is greater than the distance from basal tooth to seta subdentalis, inner margin with a large appressed spine near the base; mentum ( Fig. 47E ) with 4 median teeth of which the middle pair is usually shorter, 6 lateral teeth, 1 st lateral is smaller than the 2 nd , and a line extends from the anteromedian tip of VM plate towards the outer median tooth but does not connect. FIGURE 47. Tribelos jucundum (Walker) , larva (A–E). A—frontoclypeus and S3-seta; B—labrum and premandible; C—antenna; D—mandible; E—mentum. Notes. This species is easily distinguished from other Tribelos by the long antennal blade. The larva generally agrees with the description by Grodhaus (1987) . Ecology and habitat. The larvae of this species are found in shallow ( 0.5–4.5m ) parts of lakes and streams on sandy substrates with muck and under weed beds ( Grodhaus 1987 ). Sampling sites. Mississagi, Little White River, Arrowhead and Algonquin Provincial Parks. Also collected in streams in Muskoka and Parry Sound Districts. Nearctic distribution. Canada : British Columbia to New Brunswick , including Ontario. USA : Oregon to Oklahoma and Florida .