9. Latero-dorsal margin of head with a small 



protuberance bearing a seta; first two antennal 

 segments with large distal expansions. Head tri- 

 angular in outline. Large species; (4.0+) 



pronotum with lateral flanges TRINOTON 



Not as above 10 



10. Head without preocular notch or slit; both sexes 

 with a group of long stout setae on each postero- 

 lateral angle of enlarged sternite II; third femora 



and abdominal sternites with or without brushes MYRSIDEA 



Not as above 11 



11. Prosternal plate with thickened margin and with 

 more than two median setae; preocular notch or 



slit absent 12 



Without all of the above combination of characters 13 



12. Gular plate horseshoe shaped; temples greatly 



expanded laterally EUREUM 



Gular plate not horseshoe shaped; temples not 



greatly expanded but broad and angulate DENNYUS 



13. Head without preocular notch or slit; cavity 

 between latero-dorsal and latero-ventral 



margins of head pouch-like 15 



Not as above 14 



14. Head with narrow preocular slit; prosternal 

 plate with a median pointed process; prosternum 



with two median setae EIDMANIELLA 



Without above combination of characters 17 



15. Prosternal plate with more than two median setae; 

 gular plate large with or without central per- 

 foration and lateral processes MACHAERILAEMUS 



Prosternal plate with two median setae 16 



—HOLOMENOPON 



16. Prosternal plate with deeply serrated posterior 



margin 



Prosternal plate without deeply serrated 



posterior margin AUSTROMENOPON 



17. Prosternum with two median setae; mesosternum with 



more than two median setae; shallow preocular notch; 

 head slightly wider than long; abdomen ovoid with 

 sparse chaetotaxy; 3rd femora without brushes only 



3-5 setae present BONOMIELLA 



Prosternum with two or more median setae; abdomen 



narrowly elongate or elongate-ovoid 18 



12 



