326 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



Rhyssa Gravenhorst. 

 Nearly as large as Megarhyssa; black, with yellow mark- 

 ings; wings transparent and tinted with yellowish or yellowish 

 brown ; legs mostly reddish stramineous. 



Key to Species. 

 Antennae with a yellow annulus albomaculata 



Antennae without a yellow annulus, but uniformly blackish.. 



persuasoria 



R. albomaculata Cresson. 

 Hamden, 15 June, 191 1 (W. E. B.). 

 °R. persuasoria Linnaeus. 



Arotes Gravenhorst. 

 Length 10-17 mm.; antennae ' with a yellow annulus or with 

 the greater part of the apical half yellowish except tips. 



i 



Key to Species. 



1. Second recurrent vein interstitial with cubital vein 2 



Second recurrent vein not interstitial with cubital vein 4 



2. Mostly black, with yellowish maculae 3 



Stramineous, with black maculae; exserted portion of ovipos- 

 itor about as long as abdomen venustus 



3. Hind femora black; exserted portion of ovipositor about as 



long as body formosus 



Hind femora testaceous; exserted portion of ovipositor longer 

 than abdomen vicinus 



4. Hind femora not black 5 



Hind femora black, tipped with yellowish; exserted portion 



of ovipositor as in formosus amcenus 



5. Hind femora stramineous, tipped with black; exserted por- 



tion of ovipositor as long as or a little longer than body . . 



decorus 

 Hind femora stramineous throughout or at most with ex- 

 treme base brownish vicinus 



A. amoenus Cresson. Howard, Insect Book, PI. x, Fig. 24. 

 Colebrook, 12 July, 1905 (H. L. V.). 

 A. decorus Say. 

 °A. vicinus .Cresson. 

 ^'A. formosus Cresson. 

 °A. venustus Cresson. 



