38 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.61. 



the National Collection also one male specimen reared from Swam- 

 merdamia on black birch by C. R. Ely at East River, Connecticut, 

 August 19, 1917. 



20. MICROGASTER CARINATA Packard. 



Microgastcr carinatn Packakii, Proe. Boston Soc. Nat. Hist., vol. 21, 1880, 



p. 25. 

 Microgastcr (jclccliiac, var. carinata Riley, Amer. Natural, vol. 16, 1882, 

 p. 679. 

 Type. — In the United States National Museum. 

 Readily distinguished by the characters given in the key to species. 

 Massachusetts ( ? ) 



Host. — Vanessa atalanta Linnaeus (Packard), 

 Known only from the type material. 



21. MICROGASTER COMPTANAE Viereck. 



Microgastcr comptanae Viereck, Proc. U. S. Nat. Mus., vol. 39, 1911, p. 403. 



Type. — In the United States National Museum. 



Face very weakly punctate and strongly shining, with no indication 

 of a median carina below antennal fossae; posterior femora, tibiae 

 and tarsi, wholly testaceous ; third abdominal tergite entirely smooth. 



Rocky Ford, Colorado. 



Host. — Ancylis comptana Frolich. 



Known only from the two specimens of the type series. 



22. MICROGASTER CANADENSIS, new epecies. 



Very similar to comptaiiae Viereck, from which it can be distin- 

 guished by the rugulose face, by the posterior tibiae at apex and the 

 posterior tarsi being infuscated, and by its larger size. 



Female. — Length 3.3 mm. Face finely rugulose and opaque ; vertex 

 polished; temples weakly punctate and shining; antennae very 

 slightly shorter than the body; mesoscutum punctate anteriorly, 

 impunctate and polished posteriorly ; scutellum flat, impunctate, pol- 

 ished; mesopleurae practically entirely impunctate and polished, 

 with a smooth, dimple-like impression posteriorly; propodeum ru- 

 gose, with a prominent median carina; stigma about as long as 

 metacarpus; radius arising a little beyond middle of stigma and 

 somewhat directed outward; posterior coxae smooth and polished, 

 about half as long as thorax ; inner spur of middle tibiae as long as 

 middle metatarsus ; inner spur of posterior tibiae two-thirds as long 

 as posterior metatarsus ; abdomen broad, as long as thorax, and about 

 twice as long as its greatest breadth ; first abdominal tergite broad- 

 ening posteriorly, about as broad at apex as long, rugose; second 

 tergite transverse, more than three times as broad as long, no longer 

 than third ; suture between second and third tergites minutely crenu- 

 iate and distinctly curving forward at the sides, so that the second 



