KELLICOTT. 107 



legs black. Front wings black at extreme base, this 

 color may extend outward a short distance between 

 subcostal and median veins, and submedian and post- 

 costal veins, thus forming two basal streaks. Hind 

 wings black at base, here the color takes the form of a 

 basal black streak and a basal triangle beneath. The 

 abdomen is black with a superior yellow spot on the 

 base of 7. In young specimens a dorsal spot is 

 present on each of segments 2-7. 



The female usually has more or less yellowish on 

 the basal third of the wings, and the abdomen is 

 stouter and marked with yellow on the sides as well as 

 on the dorsum. 



A common species. 



DIPLAX, Charpentier. 



Six Ohio species are included within this genus. 

 Most of them are seldom seen flying over water 

 but may be found in profusion in the adjoining marshes 

 or lowlands. Males and females inhabit the same spot, 

 and are each taken in nearly equal numbers. They are 

 characterised while on the wing by their striking red 

 bodies, which become dull brown in dry specimens. 

 This red color is not apparent, however when the insect 

 first emerges, and only comes gradually with increasing 

 age. Old and worn specimens have lost the bright red 

 and appear duller in coloration. One or more species 

 may be found on the wing at any time between June 

 10, and the middle of October. 



I offer the following Key -which is largely taken 

 from Calvert's work on the genus, as an aid in separa- 

 ting our species : 



1. Basal half of hind wings yellowish 5 



Hind wings with extreme base, or not at all, yellowish 2 



2. Expanse over 60 millimeters, an additional carina on abdominal 



segment 4 corrupta. 



Expanse less than 60 millimeters, no additional carina on 4 3 



