Differentiation of larvae and pupae of aquatic genera of Nearctic Hemerodromiinae (Diptera: Empididae) Brammer, Colin A. Harkrider, Robert Macdonald, John F. Zootaxa 2009 2069 59 68 [693,922,808,834] Insecta Empididae Animalia Diptera 6 65 Arthropoda subFamily Hemerodromiinae    1 Terminal abdominal segment ending in a pair of prominent, divided apical lobes; terminal pair of prolegs at least 2 xlonger than preceding 6 pairs ( Figs. 1a, 1b) ............................................................................  HemerodromiaMeigen   -Terminal abdominal segment lacking apical lobes; terminal pair of prolegs 1.5– 2x longer than preceding 4 pairs (anterior 2 pairs may be shorter yet) ( Figs. 2–4) ......................................................................................................... 2   2 Body robust, prolegs long and robust ( Fig. 2a), 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. 2b) ...................................................................  NeoplastaCoquillett   -Body slender, prolegs short and slender ( Figs. 3a, 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. 3b, 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. 3a) ...................................  CheliferaMacquart   -Setae on terminal abdominal segment and longitudinal cuticular striations weakly developed relative to couplet 3 above (see diagnosis section for explanation and interpretation) ( Fig. 4a) ................................  MetachelaCoquillett