H2 W. H. ASHMEAD. 



Scutellum (apterous form) with one fovea; liead much broader than 

 thorax, wide back of eyes; abdomen lai-ge and long, with third, 

 fourth, fifth and sixtli segments subequal ; antennse with joints 

 beyond third short, cylindrical, small at base, truncate at tip, 

 somewhat serrate ; (winged form) radial area quite narrow, with 

 the radial vein barely reaching costal edge ; antennse longer and 

 much more slender than in the wingless form, third joint in %, 

 greatly excised, following joints short, 9 14, % 15-jointed. 



(10) Biorliiza Westwood. 

 cc. — Species very hairy. 



Scutellum rounded, as broad as long, depressed at base with two small 

 approximate fovete ; wings long, radial vein reaching costal edge ; 

 anteunje short, third joint but slightly longer than fourth, eighth 

 and beyond cylindrical oval, 9 13- 14-jointed. 



(S) C'ynips Linnaeus. 

 Scutellum rounded, without fovea', or with a poorly defined one ; head 

 very narrow back of eyes ; radial vein barely reaches costal edge, 

 tip obtuse ; eyes small ; legs very hairy, third parapsidal groove 

 wanting; antennse long, slender, third joint but slightly longer 

 than fourth, others long, subequal to seventh, following short, J 



13-14-joiuted • (12) Holeaspis Mayr. 



aa. — Parapsidal grooves wanting, or very indistinct, not extending the whole 

 length of mesonotum. 

 bb. — Thorax narrow, head full behind the eyes. Species smooth. 



Scutellum without fovese and ending in a blunt horn ; forms apterous, 

 or with rudimentary wings ; antennaj 9 14-jointed. 



(9) Acraspis Mayr. 

 Scutellum with a transverse curved groove at base, no fove?e ; face 

 full, cheeks with a distinct groove ; antennae : third joint in 9 loug, 

 slender, cylindrical, others long, cylindrical oval, subecjual ; in % 

 third joint thickened, excised, following joints short, 9 13, % 15- 

 jointed (11) Lioxaulis Mayr. 



bbb. — Thorax robust, bulging. Species rugose, not very hairy. 



Scutellum quadrate, elevated posteriorly, bifoveate ; abdomen globose ; 

 radial vein acuminate, ending some distance from costal edge ; wings 

 black, or with a large blotch at base of radial area ; antennge short, 

 third joint nearly twice as long as fourth, others short, cylindrical, 



9 13-14, % 15-jointed (6) Aiiipliibolips Eeinhardt. 



V)b))l).— Thorax not robust. Species polished. 



Sctitellum bifoveate ; radial vein reaching costal edge ; areolet and 

 cubital vein very faint and occasionally obsolete ; radial area occa- 

 .sionally obsolete ; radial area occasionally entirely closed ; antennfe 

 and legs finely pubescent, autenuje long, subfiliform, 9 13-15, % 



15-16-jointed (14) fKeiiroterus Hartig. 



.\A. — Radial area closed. 



Scutellum bifoveate ; ventral valve of 9 greatly elongated, pointed 

 and shining; antennfe 9 14, % 15-jointed.. (2) Itho«lites Hartig. 



t In Neuroterus aprilinus Giraud, the radial area is closed, and in two or three 

 other European species in this genus it is partly closed, but all the American 

 species known to me have an open radial area. 



