Key to species of Physotarsus Townes, 1966
1 Fore wing weakly (Fig. 9) to strongly (Fig. 44) yellowish or brown to black at base, with (Figs 9, 32) or without (Figs 46, 61) infumate areas apically .......................................................................................................................... 2
- Fore wing hyaline at base (as in Figs. 13, 15) ............................................................................................................. 8
2(1) Fore wing evenly colored, entirely infumate/fuscous (Fig. 46) or pale yellowish-brown ......................................... 3
- Fore wing not evenly colored (as in Figs 44, 61) ....................................................................................................... 4
3(2) Fore wing pale yellowish brown .......................................................................................... P. albus Zhaurova, n. sp.
- Fore wing dark, entirely fuscous .................................................................................. P. m e l i p e n n i s Zhaurova, n. sp.
4(2) Basal part of fore wing dark brown to black, apical part variable (Figs 44, 61) ........................................................ 5
- Basal part of fore wing yellowish, apex infumate (as in Figs 9, 32) .......................................................................... 6
5(4) Mesosoma dorsally, excluding pronotum, orange; hind femur and tibia orange ..... P. maculipennis (Cresson, 1874)
- Mesosoma dorsally, excluding pronotum, dark brown to black; hind femur and tibia black ....................................... ....................................................................................................................................... P. varicornis (Cameron, 1886)
6(4) Mesosoma with yellow and black markings, face quite densely punctate medially (Fig. 33) .................................... ....................................................................................................................................... P. flavipennis Zhaurova, n. sp.
- Mesosoma entirely yellowish to light orange, face very lightly evenly punctate (Fig. 28) ........................................ 7
7(6) Frons and first tarsomere of hind leg orange ............................................................................ P. adriani Gauld, 1997
- Frons and first tarsomere of hind leg black ............................................................................ P. castilloi Gauld, 1997
8(1) Epicnemial carina strongly turning towards anterior margin of mesopleuron, reaching it or nearly so .................... 9
- Epicnemial carina largely parallels anterior margin of mesopleuron ....................................................................... 14
9(8) T1 with apical third white, otherwise largely dark brown; ocellar field entirely black .. P. oculatus Zhaurova, n. sp.
- T1 either uniformly colored or dark apically, at most with narrow white apical margin; ocellar field variable, entirely black in some species, not in others .......................................................................................................................... 10
10(9) T1 entirely yellowish, orange, or light brown, color even ..................................................................................... 11
- T1 partly to entirely dark brown .............................................................................................................................. 12
11(10) T1 2.3X as long as broad ....................................................................................................... P. eli ethi Gauld, 1997
- T1 1.2X as long as broad ................................................................................................... P. j a m e s i Zhaurova, n. sp.
12(10) Propodeum brown, at least on anterior half ..................................................................... P. niveus Zhaurova, n. sp.
- Propodeum entirely orange ....................................................................................................................................... 13
13(12)Clypeus yellowish orange; hind femur dark brown ......................................... P. leucohypopygus Zhaurova, n. sp.
- Clypeus white; hind femur yellowish orange ................................................................. P. glabellus Zhaurova, n. sp.
14(8) Ventral clypeal margin with a prominent angulate central lobe (Fig. 7) ................................................................ 15
- Ventral clypeal margin not as above ......................................................................................................................... 16
15(14) Body entirely yellowish orange with no brown or black markings ..................................... P. bonillai Gauld, 1997
- Mesoscutum and face with dark brown markings; anterior half of the propodeum brownish to black ....................... ............................................................................................................................................ P. claviger Zhaurova, n. sp.
16(14) Mesosoma entirely yellow to orange .................................................................................................................... 17
- Color of mesosoma variable, but at least partly black .............................................................................................. 19
17(16) Petiole dark brown ...................................................................................................... P. glabellus Zhaurova, n. sp.
- Petiole either pale yellow or dark orange ................................................................................................................. 18
18 (17) Petiole pale yellow; antenna abruptly changing from pale to dark subapically ............. P. luteus Zhaurova, n. sp.
- Petiole dark orange; antenna mostly dark throughout, without abrupt color change ......... P. j a m e s i Zhaurova, n. sp.
19(16) Face quite strongly protruding medially (Figs 49, 55) ......................................................................................... 20
- Face not to very weakly protruding medially (Fig. 24) ............................................................................................ 23
20(19) Mesoscutum largely impunctate posteriorly, very sparsely punctate anteriorly ............ P. gineus Zhaurova, n. sp.
- Mesoscutum densely punctate anteriorly and posteriorly ......................................................................................... 21
21(20) Mesoscutum black with anterolateral margin pale yellowish; fore and mid femora partially black ........................ ............................................................................................................................................. P. t o n i c u s Zhaurova, n. sp.
- Mesoscutum black with anterolateral margin and most or all of notaular lines pale to dark yellow; fore and mid fem- ora yellowish ............................................................................................................................................................. 22
22(21) Mesopleuron entirely black; face yellowish laterally, black medially ......................... P. foveatus Zhaurova, n. sp.
- Mesopleuron black with yellow markings; face entirely yellowish ............................ P. melotarsus Zhaurova, n. sp.
23(19) Mesopleuron and mesoscutum entirely black ........................................................ P. montezuma (Cameron, 1886)
- Mesopleuron usually and mesoscutum always with at least some yellow ............................................................... 24
24(23) Tarsomeres 3 and 4 of hind leg bright yellow, much lighter than tarsomeres 1 and 5. Male subgenital plate slightly emarginate (Fig. 22) ......................................................................................... P. concavus Zhaurova, n. sp.
- Tarsomeres of hind leg uniformly orange or brown or grading from orange to brown. Male subgenital plate deeply emarginate (Figs 25, 31, 59) ..................................................................................................................................... 25
25(24) Tarsomeres of hind leg distinctly infumate, at least dorsally. Antenna mostly dark brown over apical half, often with somewhat indistinct whitish subapical ring ....................................................... P. emarginatus Zhaurova, n. sp.
- Taromeres of hind leg orange. Antenna mostly orange to yellow orange over apical half, with apical flagellomeres contrastingly darker..................................................................................................................................................... 26
26(25) Mesoscutum with a narrow anterolateral yellow margin with yellow extending posteriorly along notaular line (Fig 26); male subgenital plate deeply emarginate, cordate (Fig. 25) ..................................... P. cordatus Zhaurova, n. sp.
- Mesoscutum with anterolateral margin usually black, never with yellow on notaular line (Fig 60); male subgenital plate deeply emarginate, inner margin not protruding (Fig. 59) ..................................... P. truncatus Zhaurova, n. sp.