22 THE CANADIAN ENTOMOLOGIST. 



16. Face of $ yeilow, S black j abdomen with a wide maculated or 



indented lateral margin ; variable maculosa, Lw. 



Face of (J 9 yellow, with a longitudinal line of black ; abdominal 

 markings transverse, tlie same in both sexes ; eyes of 9 

 glabrous badivs. Walker. 



17. Abdomen; bands on the second segment interrupted, the third and 



fourth contiguous 18. 



Abdomen : fourtlr and fifth segments only with wide yellow 



bands vmtabilis, Fabr. 



"18. Scutellum $ black i g. 



Scutellum $ $ yellow cotistans, Lw. 



19. Abdomen : bands on the second and third segments 



contiguous Gerstceckeri, Bell. 



Abdomen : second segment with two large spots . . . bimaculata, Bell. 



List of species of St7-ntiomyia studied. 



1. S. melanostoma, Lw. 



McHenry, 111. July. 



2. S. lativetitris, Loew. 



Chicago, 111. (July) ; Canada. 



3. .5". normti/a, Loew. 



Chicago, 111. (May) ; Colorado. 



4. S. norma, Wiedemann. 



Indiana ; McHenry, 111. (June). 



5. S. unilimbata. Loew. 



McHenry, III. (July); Milwaukee, Wise. (June); Berkeley, Col. 

 (May). 



6. ^S". Meigenii, Wiedemann. 



Chicago. III. ; Austin, Texas ; S. Dakota. 



7. 6". apicida, Loew. 



Algoncjuin, 111. (June) ; Austin, Texas (April). 



8. S. discalis, Loew. 



Chicago, 111. May. ' 



9. 3". badius. Walker. 



McHenry, 111. June and July. 



10. ^S". constans, Loew. 



Austin, Texas. April to October. Common. 



