214 PROCEEDINGS OF TNE NATIONAL MUSEUM. vol.58. 



punctures (the latter longer than wide) on the scutellum is distinctly 

 farther cephalad from apex of the scutellum. 



Described from one female (Accession No. 39589, Illinois State 

 Laboratory of Natural History) reared from muscid puparia, Urbana, 

 Illinois. 



Type.~C&t. No. 20877, U.S.N.M., the specimen on a tag. 



NASONIA BREVICORNIS Ashmead. 



Often has the base of all femora concolorous. 

 Dallas, Texas. 



Family MISCOGASTERIDAE. 



TRIDYMUS CLAVICORNIS, new species. 



Length, 1.70 mm. 



Female. — Head (cephalic aspect) a little wider than long, the an- 

 tennae inserted near the clypeus, strongly clavate and short, 12- 

 jointed with two ring-joints, the first very short. Clypeus ])roduced 

 distinctly, highly convex, entire. Mandibles 4-dentate. Pronotum 

 extremely short. Parapsidal furrows complete, deep. Scutellum 

 with a distinct cross-suture before apex. Propodeum of nearly 

 uniform length, distinct, moderately long, noncarinate, with five 

 foveae between the round spiracles along cephalic margin. Abdomen 

 conic-ovate, depressed above. Marginal vein a fourth longer than 

 the submarginal which is somewhat longer than the long stigmal. 

 Habitus of Systasis. 



Dark metallic greeii, the wmgs hyaline, the legs except the last 

 two pairs of coxae, the apex of the pedicel and the scape except 

 along upper and lower margins, red. Flagellum fuscous. Funicle 

 5 over twice wider than long, a third wider than 1 and somewhat 

 longer, 1 twice wider than long, much longer than the second ring- 

 joint. Pedicel short but longer than any funicle joint. Scrobicular 

 cavity obtuse, subglabrous, toward the sides with cross-striae. Club 

 short ovate, without a nipple. Head and thorax densely scal}^, 

 the scutum with scattered thimble punctures (less distinct elsewhere). 



From one female. Oxbow, Saskatchewan, Canada (F. Knab.), 



Type.— Cat. No. 20829, U.S.N.M., the female on a tag, the head, 

 hind legs, and a fore wing on a slide, 



TRIDYMUS NIGRICLAVUS Girault. 



Tridymus nigriclavus Girault, Chalc. Nova Marilandensis, 1917, p. 2. 



Female. — Length, 0.90 mm. 



Dark metallic green, the wings hyaline, the knees slightly and the 

 antennae (except the metallic scape, pedicel at immediate base above 

 and the dusky club) light yellow. Funicle 5 a little the largest, 

 quadrate, a little smaller than the pedicel; club at least three-fourths 

 the length of the funicle. Antennae inserted near the clypeus, below 



