WILLIAMS: LARRID^ OF KANSAS. 151 



6. Mandibles very narrowly notched exteriorly (fig. 25) ; black 



species obsciirus 



Mandibles with the notch normal; the first two or three segments 

 of the abdomen ferruginous abdo»ihialis 



7. Abdomen in part red 8 



Abdomen entirely black 9 



8. Clypeus not or very slightly emarginate niesad; pygidium not at 



all constricted ne:ir the apex, bronzy; species with considerable 



erect pile on head and thorax fulviveiitris 



Clypeus shallowly emarginate mesad (fig. 53) ; pygidium a little 

 narrowed before apex; erect pubescence rather sparse. 



rufofasciatus 



9. Abdomen with four silvery fascia; wings hyaline; legs black 10 



Abdomen three- fasciate; wings yellowish, dark apically; legs 



largely ferruginous; pygidium with fine pubescence. . .distinctus 

 10. Pygidium silvery; spines on legs yellowish white; abdomen greasy- 

 sericeous sericatus 



Pygidium bronzy; spines on legs brown; abdomen hardly greasy- 

 sericeous pepticus 



Males. 



1. Fore coxae simple; fore femora near the base entire 2 



Fore coxae with an elongate posterior process (fig. 13, H) ; fore 



femora beneath near the base emarginate (figs. 83 and 85) ... . 5 



2. Joints 9-11 of antennje visibly broadened on one side (fig. 42), 



thereby contrasting with the two apical joints; abdomen partly 



red or entirely black fulviventris 



Joints 9-11 of antenna normal, not broadened (figs. 40 and 41) ... . 3 



3. Flagellum with the basal joints distinctly rounded out beneath 



(fig. 40) ; thorax with long and rather dense golden pubescence; 



legs partly ferruginous 4 



Flagellum with the basal joints not or very slightly rounded out 

 beneath (fig. 41) ; the long pubescence of thorax not dense; 

 clypeus broadly rounded out (fig. 59) ; legs black pepticus 



4. Eighth ventral segment rather narrowly emarginate, the lobes 



bi-oad and rounded validus 



Eighth ventral segment rather broadly emarginate, the lobes 

 usually narrow and more pointed (fig. 108) mandibularis 



5. Pygidium with pile largely suberect; small black species 6 



Pygidium with pile all appressed ; usually larger species 7 



6. Silvery fascias of abdomen distinct; body well covered with pile; 



thorax scarcely shining, with larger, coarser punctures, .obscurus 



Silvery fascia of abdomen not very well defined; insect sparsely 



pilose; thorax shining, the punctures there finer and more 



separate intermedius 



7. Wings yellow, their apical portion dark, abdomen black; larger 



species distinctus 



Wings pale yellowish hyaline, not dark apically; abdominal seg- 

 ments 1 and 2 usually fulvous; rather small species. 



mfcfa-i-ia'm 



