1911] Muttkowski, Wisconsin DragonfUes. 41 



trusion of a boreal element into the generally Austral region about 



Milwaukee, and offers an interesting parallel to the frequent 



occurrence of boreal Hymenoptera, Diptera and Lcpidoptera in 



this region. 



.Milwaukee Public Museum. 



January 13, 1911. 



EXPLANATION OF PLATE IV. 



All figures are drawn with the camera lucida. 



Figs. 1 and 2, Enallagma walkeri n. sp. Fig. 1 showing lateral 

 view. fig-. 2 showing dorsal view. 



Figs. 3. 4 and 5, Enallagma geminatum Kellieott. Fig. 3 showing 

 male appendages viewed from the right, fig. 5 from the left, fig. 4, 

 dorsal view. 



Figs. 6 and 7. Ischnura prognatha Hagen. Fig. 6 lateral view, fig. 

 7 dorsal view. 



Fia-s 8 and 9, Ccenagrion rcsolutum Hagen. Fig. S lateral view 

 of male appendages, fig. 9 dorsal view. 



Fie-s. 10, 11, 12 and 13, Gomphus cavillaris Needham. Fig. 10 show- 

 ing dorsal view of male appendages, fig. 11 lateral view, fig. 12 the male 

 genitalia, fig. 13 the female vulvar scale. 



Figs. 14. 15 and 16, Gomphus lenttllus Needham. Figs. 14 and 16 

 showing dorsal and lateral view of anal appendages, fig. 15 the 

 genitalia. 



