274 HYMENOPTERA. 



1. Species black, unmarked, proximal funicle joints uneven 



americanus Brues. 



2. Species brownish black to olivaceous ; an oblique, longitudinal 



pale streak along each side of mesoscutum ; marginal vein 

 of fore wing seven or eight times longer than wide. 



autliouomi Girault. 



3. Species brown-black ; unmarked on thorax ; marginal vein of 



fore wing only about five times longer than broad. 



texanus Girault. 



4. Species pure brown, small; antennae slender. 



bniimeus Girault. 



5. Species pale cadmium yellow, the abdomen darker distad, the 



legs uniformly concolorous ; joint 4 of funicle twice longer 

 than wide, over half the length of joint 5.. ..aureus Girault. 



6. Species brown-black, the base of the abdomen yellow ; third 



funicle joint of antennae nearly as long as the pedicle and 

 distinctly longer than joints 1, 2, or 4. Small ; marginal 

 vein of fore wing shorter pygniaeus Girault. 



II. Valves of the ovipositor distinctly exserted for some length ; fore 



wings comparatively narrow and slender, or only moderately 

 broad, without a fascia. Species deep black, marked with 

 pale cadmium yellow or pallid. Abdomen long, conic-ovate, 

 body more slender, graceful. 

 1. Antennae slender, funicle joint 4 shorter respectively than either 

 the one following or the one preceding ; funicles 3 and 5 

 longest ; posterior wing not wide across the apex of the vena- 

 tion, its marginal cilia long. 



Species black, base of abdomen distinctly marked with pale 

 cadmium yellow or pale yellow as is also the base of the 

 valves of the ovipositor ; fore wings more distinctly fumated 

 than usual ; antennal scape and pedicel varying to pallid ; 

 proximal tarsal joint of posterior legs short. Funicle joints 

 2 and 3 long, longer than pedicel, subequal. 



rivalis Girault. 



Species wholly black, only the legs marked with pallid ; proxi- 

 mal tarsal joint of posterior leg longer. Fore wings only 

 very slightly uniformly fumated. Funicle joints 2 and 3 

 unequal, the latter longer but hardly as long as the pedicel. 



maga Girault. 



III. Valves of ovipositor not exserted. Fore wings with a fascia. 



1. A short brown fascia across wing just before apex of marginal 



vein ; second funicle joint of antennae longer than pedicel. 

 Marginal vein long fasciatus Girault. 



2. A short, somewhat broader fascia across wing slightly beyond 



apex of marginal vein ; second funicle joint shorter than the 

 pedicel ; marginal vein shorter novifasciatus Girault. 



