THE ENTOMOLOGIST. 



539 



II The last joint only of the flagellum larger 



than the preceding joints. - - Monockita. 



j-f Wings with uo basal and submarginal vein. 



I Lateral ocelli nearer to the third one than to 



the inner border of the e3^es. - - Isostasius. 



11 Lateral ocelli nearer to the inner border of 



the eyes than to the third ocellus. 

 § Female ^vith a horn on the first abdominal 



segment. .... Inostemma. 



§§ Female with no horn on the first abdominal 



segment. .... Acerota. 



B. Submarginal vein with no knob at the tip. 

 a. Scutellum more or less elongated, not semi- 

 circular, or when shortened then always 



compressed on the sides, with a pointed 



wart-like tip. 

 =:= Thorax compressed on the sides. - - Piestopleura. 



*=!= Thorax not compressed on the sides, 

 f Scutellum elongated, -without a spine-shaped 



or wart-like tip. 

 I Furrows of the parapsides deep. Club of the 



antenna) of the female not determinate ; 



two last joints distinct. - - - Xestonotus. 



II Furrows of the parapsides indistinct or want- 

 ing. Club of tlie antenuse of the female 



4-joiuted; two last joints as one. - Amblyaspis. 



ft Scutellum elongated, with a spine-shaped or 



wart-like tip. 



I Scutellum ending in a more or less stout 



spine. 

 § Lateral ocelli nearer to the inner border of 



the eyes than to the third one. Club of 



the antennte in the female 4-jointed. - Leptacis. 



§§ Lateral ocelli not nearer to the inner border 



of the eyes than to the third one. Club 



of the antennte of the female 3-jointed. 



Head rhomboidal when seen in front. - Isoehombus. 



II Scutellum somewhat shortened and com- 



pressed on the sides, pointed or wart-like 

 at the tip. 

 I Abdomen very much elongated. - - Ectadius. 



II Abdomen not unusually elongated. 



§ Second ventral segment much contracted in 



the female. .... Sactogaster. 

 §§ Second ventral segment not contracted in 



the female. .... Synopeas. 



