94 DRAGONFLIES OF OHIO. 



male. Easily separated from flavescens by the red 

 base, and fuscous spot at anal angle of hind wing. 



The species has been taken at Columbus (Osburn), 

 Laramie Reservoir (Williamson), and Columbus, in July. 



TRAMEA, Hagen. 



This genus contains three Ohio species. The base 

 of hind wing in all of them is wide and conspicuously 

 colored. Abdominal segments 3 and 4 with one ad- 

 ditional transverse carina, nodal sector not waved or 

 broken. 



1. Basal fourth or fifth of hind wings violet black lacerata. 



Basal part of hind wings brown 2. 



2. Basal third of hind wings brown, hamule not exceeding the 



genital lobe in length, vulvar lamina shorter than 9 Carolina. 



Basal fourth of hind wing brown, hamule exceeding the genital 

 lobe, vulvar lamina as long as 9 onusta. 



Tramea lacerata, Hagen. 



Length: of abdomen o* 37, 9 35 ; hind wing o* 42- 

 45, 9 46. 



Male, color brownish black. Front blackish, 

 vertex and large part of frons metallic violet. Thorax 

 with a greenish reflection, legs black, anterior wings 

 hyaline, black at extreme base, hind wings violet black 

 at base, the outer edge ragged, a triangular, hyaline 

 space near the middle of the anal margin. A large 

 light colored spot on the dorsum of the seventh ab- 

 dominal segment, often obscure in dry specimens. 

 Superior appendages as long as one half of 8 + 9 + 10, 

 hamule shorter than the genital lobe. 



The female has yellowish white markings on 3-7; 

 on 3-5 these consist of a pair of small spots. Vulvar 

 lamina one half as long as 9. 



The species is common in all parts of the state dur- 

 ing a large part of the summer. 



