126 PIMPLINE ICHNEUMONIDAE 



5. Rounded spots on the sides of the abdomen. . .nortonii (Cress.) (p. 131) 

 No rounded spots on the sides of the abdomen 6 



6. Yellow band behind the eyes bordered posteriorly with a black band. 



In second abdominal segment, pleura and sternum fused as far as or 



but shghtly l^eyond the spiracles, wings clouded at their tips 



lunator (Fabr.) (p. 133) 



Yellow band behind the eyes not bordered posteriorly with a black band. 

 Fusion of pleura and sternimi extending twice the distance from base 

 of segment to spiracles, wings not clouded at tips . greenei (Vier.) (p. 136) 



Table to Males 



1. Black or mostly black 2 



Xot black 3 



2. Abdomen with white spots on its sides nitida (Cress.) (p. 137) 



Abdomen without white spots on its sides canadensis (Cress.) (p. 129) 



3. Recurrent nervure interstitial with outer transverse cubital 



nortonii (Cress.) (p. 131) 



Recurrent nervure not interstitial 4 



4. Wings fuscous atrata (Fabr.) (p. 128) 



Wings not fuscous 5 



5. Yellow behind the eyes bordered by a black band extending around the 



head nearly to the mandibles, wings clouded at tips 



lunator (Fabr.) (p. 133) 



Yellow behind the eyes merging into a hght brown band, wings not clouded 

 at tips greenei (Vier.) (p. 136) 



Megarhyssa humida (Say) 



Pimpla humida Say, Boston Journ. Nat. Hist., i, pt. 3, 1836, p. 224, n. 1, $ . 

 Pivipla humida LeConte, Writings of Thos. Say, ii, 1859, p. 683. 

 Rhyssa humida DaUa Torre, Cat. Hym., iii, 1901-2, p. 483. 



Type. As this species was named by Say, the type cannot be 

 located. 



The female of this species is about half an inch long with an ovipositor 

 slightly longer than the body. The head is yellowish-white with the vertex 

 and a broad central band extending to the base of the insertion of the antennae 

 dark, as is also the clypeus. There is a large dark spot in the middle of the 

 lower margin of the frons from which a dark band extends to the antennae. 

 The mandibles are black but the palpi are white. The antennae are brownish- 

 black. 



A broad yeUowish-white band extends forward along the upper bordcn- of the 

 prothorax from the tegula nearly to the middle line in front and downward 

 at its posterior end, making the spot somewhat L-shaped. Beneath this band 

 is a broad dark band running parallel to it, which occupies almost all of the 

 remaining portion of the prothorax. Just below this dark band and above 

 the procoxa is a pale rufous streak. The prosternum is pale rufous. The 

 mcsonotum is darlc as is the prescutum. This dark color from the prcscutum 



