98 Bulletin Wisconsin Natural History Society. [Vol. 9, No. 3. 



cynosura group are compared the differences in the superior append- 

 ages seen in profile are striking — cynosura high arched dorsally and 

 excavated ventrieally at the base, with a resultant prominent ventral 

 angle, and a decidedly unsymmetrical outline ; Stella, on the other 



Figure 1. — Details of venation ; left figure showing relation of sub- 

 stig-mal series to postnodals ; right figure illustrating coincidence 

 of cubito-anal cross-vein with A4. From T. spinigera. 



hand, without this arching and excavation, and with an outline almost 

 symmetrical. Seen from above the superior appendages of Stella have 

 a dilatation on the inner side just distal to the apex of the inferior 

 appendage; the latter is relatively shorter than in the cynosura 

 group. 



Length abdomen (incl. appendages) : $ 33-34, 9 33-34 mm. 



Length fore wing : $ 30-32. 5, 9 32.5-33-5 mm., average $ 31.7, 

 9 32 mm. 



Material studied : 3 5,19, West Palm Beach, Fla., March 11th, 

 Pennsylvania State Museum, Harrisburg, Pa., all bearing the accession 

 number 8759 r, one male with last seven segments and one male with 



