MANUAL OF NATURAL HISTORY. 227 



5. Proctotrupince. Abdomen sub-sessile, cam- 



panulate ; antennae porrected, 12-jointed, 

 inserted beneath front ; maxillary lobe bi- 

 partile. 



6. Diapriince. Abdomen petiolated, campanu- 



late ; antennae 10 15-jointed, inserted in 

 front ; maxillary palpi long, 5-jointed. 



III. TRIBE. TUBE-BEARING HYMENOPTERA 

 (Tubulifera). 



End of abdomen tubular, retractile, furnished with 

 a minute sting. Larvae feeding on other insects. Pa- 

 rasitic on other Hymenoptera. 

 8. FAMILY. Ruby-tailed Flies (Chrysididae). An- 

 tennae filiform, elbowed at end of long basal 

 joint; head transverse above; maxillae end- 

 ing in a large pilose outer lobe ; mandibles 

 long, sub-trigonal ; thorax oblong, metathorax 

 armed on each hind margin with a spine; 

 fore- wings with a single marginal cell ; hind- 

 wings nearly veinless ; abdomen with under 

 side concave, with a very short peduncle, ter- 

 minal segments telescopic, retractile ; ovipo- 

 sitor sting-like, with two styles of the same 

 length. Adorned with brilliant metallic 

 tints ; fly and run in the hot sunshine with 

 great vivacity. 



II. SUB-ORDER. STINGING-HYMENOPTERA (Aculeate). 



Abdomen of females armed with a sting connected 

 with a poison reservoir. 



