REVISION OF GENUS EUCERCERIS CRESSON 3 



were prepared by Thelwyn M. Koontz. Special acknowledgment 

 should go to Janet Bedea who has done most of the typing and many 

 other routine services in this connection. 



The wi'iter is also deeply indebted to Dr. Paul O. Ritcher, Head 

 of the Entomology Department, Oregon State University, for the 

 use of facihties in that department. Special acknowledgment should 

 go to Dr. Karl V. Ea-ombein of the United States National Museum 

 who has checked over the keys and assisted in many other ways 

 to make this and related pubhcations possible. 



Financial assistance for these studies has come from grants by the 

 National Science Foundation and from grants for General Research 

 under the Graduate School, Oregon State University. 



Key to Species of Eucerceris Cresson 



Seven segments in abdomen; 13 segments in antennae male 



Six segments in abdomen; 12 segments in antennae female 



MALES 



1. Second submarginal cell not petiolate 2 



Second submarginal cell petiolate 32 



2. No distinct row or cluster of erect bristles on venter (western United States 



and Canada) flavocincta Cresson 



One or more distinct rows or clusters of bristles on venter 3 



3. Row or cluster of bristles on 5th sternum only, sometimes very inconspicu- 



ous 4 



Rows or clusters of bristles on more than one sternum 13 



4. Mid femora with a deep depression beneath at base bordered by dense long 



setae; two inconspicuous clusters of bristles on sternum 5 (one or both 



clusters sometimes broken off) 5 



Mid femora normal in form 6 



5. Terga of abdomen with broad fulvous bands showing little or no emargi- 



nation (southern Arizona and New Mexico, western Texas, north central 



Mexico) lacunosa lacunosa ScuUen 



Tergal bands deeply emarginate with ferruginous (CoachuUa, Mexico, south- 

 ern Texas, and one record from Portal, Ariz.) 



lacunosa sabinasae, new subspecies 



6. Scutum covered with a dense layer of short setae giving a distinct velvet- 



like appearance (western Mexico, Sonora to Oaxaca) . . velutina Scullen 

 Setae of thorax normal 7 



7. Black with yellow to white markings 8 



Partly or largely ferruginous and fulvous 11 



8. Light vittae of face fusing above the antennae (southwestern states) 



arenaria Scullen 

 Light vittae of face not fusing above the antennae 9 



9. Dark vittae of face do not extend beyond the dorsal clypeal border, except 



for a hair line between the clypeal lobes; single row of bristles on 5th ster- 

 num (Rocky Mountain area) fulvipes Cresson 



Dark vittae of face extending onto clypeus 10 



