Key to Nearctic species of the Coxalis species­group

1. Fore wing stigma unicolored brown or yellow (Fig. 22) .......................................... 2

­ Fore wing stigma bicolored, brown with yellow at base or base and apex (Fig. 17) 7

2(1). Metasoma mostly orange or yellow, although sometimes apical terga melanic or black (Figs. 3, 7) ........................................................................................................ 3

­ Metasoma mostly black or dark brown, first tergum always melanic (Figs. 1, 5, 8) 4

3(2). Body length 4–6 mm; head and mesosoma usually with black markings; fore wing stigma usually medium to dark brown (Figs. 4, 15, 22) ............................................. ....................................................................................... sanctihyacinthi (Provancher)

­ Body length 8–9 mm; body entirely honey yellow; fore wing stigma usually yellow or light brown (Fig. 10) ........................................................... whartoni NEW SPECIES

4(2). Fore wing vein 1cu­a beyond 1M by distance less than length of 1cu­a, thus 1cu­a longer than 1CUa (Figs. 1, 2, 18) .......................................... aquilonius NEW SPECIES

­ Fore wing vein 1cu­a beyond 1M by distance equal to or greater than length of 1cu­ a, thus 1cu­a equal to or shorter than 1CUa............................................................... 5

5(4). Legs brown, mesonotum orange ........................................... floridensis NEW SPECIES

­ Legs, at least fore and middle, yellow, mesonotum mostly black (Figs. 8–9)........... 6

6(5). Hind wing vein m­cu a distinct tubular vein for most of its length and nearly as long as vein cu­a; first metasomal tergum rugose coriaceous (Figs. 8, 19)......................... ........................................................................................ itamevorus Shaw and Marsh

­ Hind wing vein m­cu represented by short fuscous line or nebulous vein; first meta­ somal tergum rugose costate ........................................... maritimus Shaw and Marsh

7(1). Fore wing second submarginal cell short, forming a short rectangle or nearly square (Fig. 21)................................................................................. quadratus NEW SPECIES

­ Fore wing second submarginal cell long, forming a long rectangle (Fig. 17) ........... 8

8(7). Metasoma entirely black or dark brown, occasionally with orange on terga 2–4;

mesosoma black, at most with mesonotum and pronotum orange (Fig. 5) ................ ............................................................................................ dichromatus NEW SPECIES ­ Metasoma entirely orange or yellow, rarely with apical terga darker, particularly in males; mesosoma orange or yellow, rarely marked with black (Fig. 3) .................... 9

9(8). Median length of pronotum greater than either the ocell­ocular distance or the ength of first flagellomere (Fig. 11) ........................................... aciculatus Cresson

­ Median length of pronotum equal to or shorter than either the ocell­ocular distance or the length of first flagellomere (Fig. 3) ............................................................... 10

10(9).Metasomal terga 1–3 distinctly costate or with parallel longitudinal ridges separated by deep sulcations (Fig. 3) ............................................................ brevis NEW SPECIES

­ Metasomal terga 1–3 rugose or rugose costate (Figs. 27–29).................................. 11

11(10).Length of second metasomal tergum equal to or longer than basal width, first metasomal tergum longer than apical width (Figs. 27–28) ........... shenefelti NEW SPECIES

­ Length of second metasomal tergum less than basal width, first metasomal tergum wider at apex than length (Fig. 7) ........................................................................... 12

12(11).Mesosoma honey yellow; mesonotum weakly coriaceous, appearing nearly smooth and shining; antenna with more than 35 antennomeres ......... cultrarius NEW SPECIES

­ Mesosoma orange marked with black; mesonotum strongly coriaceous; antenna with less than 35 antennomeres (Fig. 7) ......................... wyomingensis NEW SPECIES