PHYLUM ARTHROPODA — CLASS INSECTA 



317 



/€iSV 



/2. 



pygidium; 10, beet aphid, adult wingless female; 11, adult of one of the varieties 

 01 grape leafhopper common in Utah, Erythronewa siczac Walsh ; 12, adult male 

 of Emvoasca filamenta De L. (Nos. 1, 2, 5, 6, 10, 11, 12 from Knowlton, permis- 

 sion Utah Agricultural Experiment Station. Nos. 3, 4, 7, 8, 9 from Jorgensen, 

 courtesy Utah Academy of Sciences, Arts and Letters.) 



