Provisional Key to Eastern Nearctic Sweltsa Larvae

( S. holstonensis and S. voshelli unknown)

1 Tibial fine fringe setae sparse and about half as long as median outer marginal seta (Fig. 3) …… 2

1’ Tibial fine fringe setae more abundant and about as long as median outer marginal seta (Fig. 23) 6

2 Metanotal wingpads with less than five intercalary setae (Fig. 2) …………………………. 3

2’ Metanotal wingpads with at least 10 intercalary setae (Fig. 37) ………………….…………………. 4

3 Tergum 10 bearing 2 intercalary setae (Fig. 4) …………………………….…….….……… hoffmani

3’ Tergum 10 without intercalary setae (Fig. 29) …………………………………………….. palearata

4 Tergum 10 bearing ca. 10- 12 intercalary setae in two lateral clusters (Fig. 39) ……….…..… urticae

4’ Tergum 10 usually with at most, two intercalary setae (Fig. 9) ……………………….………..…… 5

5 Longest dorsal cercal setae on ca. segment 12 subequal in length to two cercal segments (Fig. 10).…………………………………………. lateralis

5’ Longest dorsal cercal setae about as long as 1.5 cercal segments (Fig. 35) ..…………….. pocahontas

6 Longest dorsal cercal setae about as long as 1.2-1.5 cercal segments (Fig. 15) ………..……….. mediana

6’ Longest dorsal cercal setae subequal in length to two cercal segments (Fig. 25) ..………………….. 7

7 Abdominal terga dark brown, occiput about as dark as frons (Fig. 21); meso and metanota rather densely covered with long, dark clothing hairs ……………………………………………..….. onkos

7’ Abdominal terga pale brown, occiput almost entirely pale (Fig. 16); meso and metanota with sparse brown clothing hairs …………………. naica