Hemerodromiinae

Brammer, Colin A., Harkrider, Robert & Macdonald, John F., 2009, Differentiation of larvae and pupae of aquatic genera of Nearctic Hemerodromiinae (Diptera: Empididae), Zootaxa 2069, pp. 59-68 : 65

Key to genera of aquatic larvae of Nearctic Hemerodromiinae

1 Terminal abdominal segment ending in a pair of prominent, divided apical lobes; terminal pair of prolegs at least 2 x longer than preceding 6 pairs ( Figs. 1 a, 1b) ............................................................................ Hemerodromia Meigen

- Terminal abdominal segment lacking apical lobes; terminal pair of prolegs 1.5– 2 x longer than preceding 4 pairs (anterior 2 pairs may be shorter yet) ( Figs. 2–4 ) ......................................................................................................... 2

2 Body robust, prolegs long and robust ( Fig. 2 a), crochets prominent relative to couplet 2- below (see description for actual measurements and ratios); terminal abdominal segment ending in two very small, but distinctly separated processes, each of which bears a pair of setae ( Fig. 2 b) ................................................................... Neoplasta Coquillett

- Body slender, prolegs short and slender ( Figs. 3 a, 4a), crochets less prominent relative to couplet 2 above (see description for actual measurements and ratios); terminal abdominal segment ending in two pairs of setae that do not arise from distinctly divided processes ( Fig. 3 b, 4b) .................................................................................................... 3

3 Setae on terminal abdominal segment and longitudinal cuticular striations strongly developed relative to couplet 3- below (see diagnosis section for explanation and interpretation) ( Fig. 3 a) ................................... Chelifera Macquart

- Setae on terminal abdominal segment and longitudinal cuticular striations weakly developed relative to couplet 3 above (see diagnosis section for explanation and interpretation) ( Fig. 4 a) ................................ Metachela Coquillett

Figures

FIGURES 1 – 4. Hemerodromiinae larvae. 1 a. Hemerodromia sp., lateral view (cuticular striations very weak, not included). 1 b. Hemerodromia sp., dorsal view of terminal abdominal segment. 2 a. Neoplasta sp., lateral view (cuticular striations similar to Metachela). 2 b. Neoplasta sp., dorsal view of terminal abdominal segment. 3 a. Chelifera sp., lateral view (cuticular striations emphasized). 3 b. Chelifera sp., dorsal view of terminal abdominal segment. 4 a. Metachela sp., lateral view (cuticular striations emphasized). 4 b. Metachela sp., dorsal view of terminal abdominal segment. Scale bars = 1.0 mm.