206 THE ENTOMOLOGIST. 



§§ 2nd and 3rd segments red-margined. 13. bicingulata, Q — 2| lines. 

 l\ Front coxse black. 



Female apex of 2nd segment, male apex of 2nd and 3rd, red ; the 



red more or less obsolete sometimes. 21. crassiuscula, 2^ lines. 



tf Hinder coxse red. - - - - 71. M?u'ci/icto, 3 lines. 



** Head buccated. erythropyya, var. 



B. Hind femora black. 



a. Aculeus of female about as long as 1st segment. 



Scai^e beneath red ; abdomen red ; petiole, 2nd to 7th or 4th to 

 7th segments with dark dorsal marks, or abdomen almost 

 entirely red ; hind tibiae black, middle testaceous, base whitish. 



48. melanosticta, 3 lines. 



b. Aculeus very short ; middle of abdomen more or less red ; apex of 



hind tibiae fuscous. 

 " Claws of hind tarsi pectinated at the base ; sides of head behind 

 the eyes parallel ; teeth of mandibles unequal. 



35. fulviventris, 2 — 2|^ lines. 

 *=;= Claws of hind tarsi distinctly pectinated ; sides of head somewhat 

 slanting; teeth of mandibles subequal. pagana, 1| — 2 J lines. 

 D. Abdomen red and black ; scape black beneath. 

 A. Hind femora red. 



a. Hind tibiae red, or apex more or less dark. 

 * Hind coxae red. 



Aculeus longer than 1st segment; middle of abdomen red; head 

 subbuccated. .... litoralis, 2 — 2^ lines. 



** Hind coxae fusco-maculated. 



Middle of abdomen red, head much buccated; aculeus less than 

 half of abdomen. - - - 38. hydropota, li — 2 lines. 

 *** Hind coxae black, 

 f Front coxae pale. 



Middle of abdomen red (see above) ; stigma pale. 38. hydropota, var. 

 I Aculeus of female one-third of abdomen ; stigma fuscous. 



rufata, 2 — 2i lines. 

 II Aculeus of female very short. - - 43. insidiator, 2i lines. 

 If Front coxae black ; in the male of rapax more or less red. 

 § Aculeus short. 



Aculeus hidden. .... canaliculata, 2^ lines. 



00 Aculeus projecting. 



X Extreme base of hind tibiae whitish. 54. notata, 2j — 3^ lines. 



X X Base of hind tibiae not whitish ; aculeus rather longer than notata. 



59. rapax, 2^ — 2f lines. 

 §§ Aculeus about as long as the 1st segment of abdomen, 

 -f- 2nd segment of abdomen transverse. 15. brevicornis, 3— 3-| lines. 

 -h--i- 2nd segment of abdomen not transverse. 



•KH- Aculeus longer than the 1st segment. 20. crassicomis, 2f — 4 lines. 

 +-f-KH. Aculeus less than the 1st segment. - 6. alticola, 2f lines. 



Males only. 



3rd segment red, base black; 4th, apex and sides red; 2nd 

 segment more than twice as long as wide. 



17. carnifex, 2^ — 3| lines. 

 Abdomen red ; petiole only black. - - - lufa, 4 lines. 



b. Base and apex of hind tibiae dark. 



