182 U. S. NATIONAL MUSEUM BULLETIN 216 part 3 



Frons with a distinct pit dorsolaterad of each antennal socket; ovipositor 

 about 4.3 as long from nodus to apex as it is deep at nodus, its lower valve 

 with distinct teeth from near the nodus to the apex 19 



19. Hairs on head dark brown to black; hairs on upper edge of hind tibia much 



sparser than on front face of hind tibia 5. dims (Cresson) 



Hairs on head whitish to pale brown, sometimes darker near mouth; hairs on 

 upper edge of hind tibia almost as dense as on front face of hind tibia. 



6. tejonensis (Cresson) 



20. Apicolateral lobes on segments 2 and 3 of front tarsus very long on hind side, 



almost absent on front side (fig. 381) ; occipital carina incomplete below, 

 not reaching hypostomal carina; frons with a shallow depression dorso- 

 laterad of each antennal socket 12. asymmetricus (Pratt) 



Apicolateral lobes on segments 2 and 3 of front tarsus equally long on hind 

 and front sides (figs. 374, 375, and 380) ; occipital carina reaching or almost 

 reaching hypostomal carina; frons with a pitlike depression dorsolaterad 

 of each antennal socket 21 



21. Apicolateral lobes on segments 2 and 3 of front tarsus long, fingerlike, with 



very long apical bristles (fig. 380) ; punctures on middle and lower part of 



temple very sparse 11. symmetricus (Pratt) 



Apicolateral lobes on segments 2 and 3 of front tarsus shorter, subtriangular, 

 with moderately long apical bristles (figs. 374 and 375) ; punctures on 

 temple moderately sparse 22 



22. Lower end of occipital carina curved mesad less strongly, approaching hypo- 



stomal carina at 60° to 85°; hypostomal carina moderately high; punctures 

 on mesoscutum very sparse to moderately dense, usually separated by 

 about 1.0 their diameter; segments 2 and 3 of front tarsus about 1.4 as wide 

 as front tibia (fig. 374) ; thorax black or ferruginous ; segments 2 and 3 of 

 hind tarsus fuscous, ferruginous, or sometimes yellow; rugosity of meta- 

 pleurum and upper side of propodeum moderately coarse; basal carina of 



propodeum usually partly visible 7. relativus (Cresson) 



Lower end of occipital carina curved strongly mesad, approaching hypostomal 

 carina at 90° or somewhat recurved; hypostomal carina very high; punc- 

 tures on mesoscutum dense, their interspaces about 0.5 their diameter; 

 segments 2 and 3 of front tarsus about 1.2 as wide as front tibia, their bristles 

 a little shorter than in relativus (fig. 375); thorax ferruginous; segments 2 

 and 3 of hind tarsus yellow; rugosity of metapleurum and upper side of 

 propodeum very coarse; basal carina of propodeum obsolete. 



8. pacificus (Cresson) 



23. Frons with a distinct pit dorsolaterad of each antennal socket; second recur- 



rent vein simply arched; basal carina of propodeum weak or absent. Labo- 



KATOR GROUP (p. 208) 24 



Frons without a pit dorsolaterad of each antennal socket; second recurrent 

 vein simply arched or more or less distinctly sinuate ; basal carina of propo- 

 deum strong, weak, or absent. Albitarsis group (p. 219) 28 



24. Thorax fulvous, with fuscous sutural markings; notaulus reaching not quite 



to center of mesoscutum 17. crassifeniur (Pratt) 



Thorax black, sometimes with restricted yellow or fulvous markings; notaulus 

 reaching well beyond center of mesoscutum 25 



25. Abdomen entirely black 13. laborator (Thunberg) 



Abdomen red, its first segment often partly black 26 



