NORTH AMERICAN HYMENOPTERA. 61 



Synoptic Table of the Genera. 



A. — Radial area open. 



a.— Pavapsidal grooves distinct, extending the whole length of mesoscutuni. 

 h. — Thorax not very robust. 



c— Species naked, or not very hairy, 

 d. — Species shining. 



Scutellum with one large fovea across base, radial vein strongly curved 

 and incrassated at tip; antennae longer than body, filiform; third 

 joint one-third longer than fourth, in % excised, joints long, cylin- 

 drical, small at base, gradually thickened and truncate at tip ; 9 13, 



% 1.5-jointed (1) Belonociieiiia Mayr. 



(Dryorhisoxenus Ashm.) 



Scutellum bifoveate ; radial vein almost straight, ending some distance 

 from costal edge; third abdominal segment but slightly shorter than 

 second ; antennte reach the base of abdomen, flagellar joints cylin- 

 drical oval, 9 13-14, % 14-jointed (3) Diastropliiis Hartig. 



Scutellum with two shallow transverse fovese ; wings long, radial vein 

 reaching costal edge, tip slightly bent and obtusely thickened 

 (agamic form with long hairs on antennse, legs and thorax) ; petiole 

 in % long; antenn*. subfiliform, long, third joint but slightly lon- 

 ger than fourth. 9 13-14, t) 15-jointed. 



(13) Dryophaiita Forster. 



Scutellum with a deep transverse suture, no foveas ; abdomen greatly 



compressed, knife-edged below ; ventral valve long ; antenna? 9 



14-jointed '^) "Tribalia Walsh. 



Scutellum inflated, fovese shallow and almost confluent; antenna?, 

 third joint shorter than fourth, % 13-jointed. 



(4) *AntistropIius Walsh. 



dd. — Species punctate. 



Scutellum with two fovea? ; radial vein reaching, or not quite reaching 

 costal edge, tip thickened, obtuse; antenna: third joint in 9 

 twice or one-third longer than fourth, joints beyond eighth oval, 

 cylindrical, or beyond fourth very short ; in % long, cylindrical, 

 or oval cylindrical 9 12-15, % 14-16-jointed. 



(7) AiKlrifUS Hartig. 

 f.— Claws with one tooth; autenna>, third joint in % twice or one- 

 third longer than fourth, others long, subequal ; in % third joint 

 excised, beyond fourth very short. 



Sub-genus C'allirhytis Forster. 



tt-- Claws with two teeth; antenna?: third joint one-third longer 



than fourth, joints to eighth long, cylindrical, subequal, following 



joints short Sub-genus An<lricus Hartig. 



■'■■ These two genera are unknown to me in nature, and the characters are 

 taken from the author's descriptions. 



