334 



AMERICAN HYMENOPTERA. 



G. HYPEEACMUS Holmgren. 

 1 . ovatus Davis. 



G. MIMA Davis. 

 1. washingtonensis Davis. 



Tribe ORTHOCENTRINI. 



G. BREPHOCTONUS Foerster. 

 1. califoi'nicus Ashm. 



G. HYPOLEPTUS Foerster. 

 1. Columbian us Ashm. 



G. NEURATELUS Eatzeburg. 

 1. leucospis Ashm. 



G. DELETER Foerster. 



1. suffuseus Davis. 



2. undulatus Davis. 



3. obscurus Davis. 



G. TAPINOPS Foerster. 

 1. emarginatus Say. 

 pusillus Walsh. 

 abdominalis Prov. 

 califomicus Ashm. 



G. ATMETUS Foerster. 



1. californicus Ashm. 



2. nigritus Ashm. 



3. carinatus Prov. 



tetrazonatus Ashm. 



G. ORTHOCENTRUS Gravenhorst. 



1. pilifrons Prov. 



2. nigricoxus Prov. 



apicalis Ashm. 



3. medialis Davis. 



4. canadensis Prov. 



5. trifasciatus Walsh. 



6. lucens Prov. 



G. STENOMACRUS Foerster. 



1. iutritus Davis. 



2. hastatus Davis. 



3. Vstigmatias Walsh. 



G. CAMAROTOPS Foerster. 



1. americanus Ashm. 



2. asperus Davis. 



3. premitus Davis. 

 i. ulmicola Ashm. 



flavosus Ashm. 

 liriodeudri Ashm. 



Tribe BASSINI. 



(This tribe was monographed aud listed 

 in vol. xxii.) 



Tribe EXENTERINI. 



G. DELOTOMUS Holmgren. 

 1. rufus Prov. 



G. CTENISCUS Curtis. 



1. clypeatus Cress. 



2. consors Cress. 



3. tlavicoxge Cress. 



4. orbitalis Cress. 



G. PICROSCOPUS Foerster. 



1. canadensis Prov. 



2. hulleusis Prov. 



G. DIABORUS Foerster. 



1. maculiventris Ashm. 



2. similis Davis, 



3. ignipes Davis. 



4. mediatus Cress. 



5. nebraskaensis Davis. 



6. ornatus Wal.ih. 



7. dorsalis Cress. 



8. nigrocephalus Davis. 



G. EXCA VARUS Davis. 



1. annulipes Cress. 



2. vitticoUis Cress. 



G. AUDERIS Davis. 



1. californicus Cress. 



2. albilineatus Walsh. 



ajncatus Prov. 



G. ANECPHYSIS Foerster. 

 1. curvineura Davis. 



G. EXYSTON Schiodte. 



1. nigreo Davis. 



2. marginatum Prov. 



3. excelsus Cress. 



4. flavens Davis. 



5. uigroscutum Davis. 



6. si)eciosus Davis. 



7. boreotis Davis. 



8. clavatus Cress. 



abdomiiudis Ashm. 



9. contracta Davis. 



10. articularis Davis. 



11. humeralis Davis. 



