150 THE CANADIAN ENTOMOLOGIST. 



the radius arising near the basal one-third of the st'gma and attain- 

 ing the wing margin only slightly above the wing apex; its first 

 abscissa about as ong as half the width of stigma; second discoidal 

 ceil closed. Abdomen broadly oval; the first dorsal plate distinctly 

 longer than broad, abruptly narrowed before the middle, indefi- 

 nitely rugulose; segments beyond the first smooth; ovipositor 

 slightly exserted. General colour brownish yellow; vertex, occiput 

 and temples black; cheeks and face reddish testaceous; ovipositor 

 black; wing veins .and stigma brownish; the dorsal abdominal 

 segments beyond the second brownish; scape and legs pale amber. 



A male paratype is like the female in sculpture but much 

 darker in colour; the thorax above and at sides strongly tinged 

 with brownish. 



Type Locality. — Lafayette, Indiana. 



Host. — Agromyza sp., mining leaves of Panicum. 



Type No. 15595, United States National Museum. The 

 female type is labelled Webster, No. 3814, W. J. Phillips, collector. 

 The male bears the same number, but was collected by P. Luginbill. 

 Another male specimen, abelled Webster, No. 9302 — J. J. Davis, 

 collector — was reared from the same source at Danville, Illinois. 



This species superficially resembles Opius diastatae Ashm., a 

 parasite of the corn leaf-miner, which was described by x'\shmead 

 under Bracon (Proc. U. S. Nat. Mus., 1888, p. 617). It may be 

 distinguished from that species by the foveolate mesopleural fur- 

 row and the dimple-like median impression on the mesonotum. 



Family ALYSIID^. 

 Subfamily Dacnusinae. 



Dacnusa scaptomyzae, n. sp. 



Female. — Length, approximately 2 mm. Head transverse, 

 nearly twice as broad as long; above perfectly smooth and highh- 

 polished, with a very few scattered whitish hairs on the vertex 

 and occiput; occiput concave; temples broad and slightly rounded; 

 vertex divided by a shallow median groove, running from the an- 

 terior ocellus to the occiput; eyes bare, ovate; face with moderately 

 dense whitish pubescence, smooth or nearly so, the punctures being 

 very minute, a rather distinct median carina on the upper half; 

 maxillary palpi 6-jointed, the two basal joints about equal in 



