ICIINEUMONIDiE. 101 



dusky space beneath anterior wings; wings liyaline, iridescent, nervures and 

 stigma brown, areolet wanting; legs long and slender, pale yellowish, the coxre 

 larger than usual, the two anterior pairs and the trochanters white, apical half 

 of posterior tibiae black ; abdomen long, slender, subparallel, depressed, petiola- 

 ted ; third and fourth segments yellowish-white, marked on the side with black- 

 ish, the apical segment obscure whitish ; first segment with prominent stigma- 

 tic tubercles, placed at about the middle. Length 3 lines. 



Hab. — Illinois. (Dr. Saml. Lewis.) One % specimen. Seems to belong to 

 Megastylus Scliiodte. 



M. triangularis. — %. Black, shining, clothed with a short, pale jiubescence; 

 head broad, eyes large and prominent, face densely pubescent, mandibles red- 

 dish, palpi white: antennae slender, pale luteous, slightly du^ky above; thorax 

 short, gibbous, metathorax short, declivious, densely pubescent, with a sharply 

 defined carinre across the middle; tegulpc and a dot before pale luteous; wings 

 hyaline, iridescent, nervures brown, stigma large, areolet subipiadrate, oblique, 

 second recurrent nerviire arcuated outwardly and received by areolet near its 

 tip; legs slender, two anterior pairs, and all thecoxie and trochanters, whitish, 

 the posterior pair elongate, the femora honey-yellow, the tibiae and tarsi dusky, 

 especially at tips; abdomen clavate, petiolated, the first segment long and al- 

 most linear, being very slightly broader at tip, minutely, longitudinally acicu- 

 late as well as the second segment, stigmatic tubercles not prominent; tip of 

 first segment, sometimes the basal middle of second, a large triangular mai'k on 

 the second, third and fourth, and middle of the fifth segment, pale luteous ; ajjex 

 pale and pubescent. Length 2 — 3 lines. 



Huh. — Illinois. (Dr. S. Lewis.) Two % specimens. 



M. pulcherrimus.— ^ . Shining; head lemon-yellow, tips'of mandibles, the 

 vertex, except orbits, and occiput black ; antennae longer than the body, slender, 

 filiform, .pale fulvous,.the base above and the apex blackish, scape beneath yel- 

 low; th<)rax above and abdomen black, subpubescent, with a faint subirides- 

 ceni reflection ; margins of prothorax, a subcuneiform mark on each side of 

 mesothorax anteriorly, a mark on the disk, acutely pointed on each side ante- 

 riorly, tegulse, scutellum, postscutelium and the margins of their lateral re- 

 gions, a spot on each side before the scutellum, the pleura except a large mark 

 beneath the wings, a spot behind the posterior wing, a triangular mark on me- 

 tathorax posteriorly and an irregular line on the sides, all lemon-yellow; me- 

 tathorax smooth and rounded; wings hyaline, iridescent, nervures brown, 

 stigma pale, areolet obliquely triangular, petiolated; legs long, er^pecially the 

 posterior pair, slender, yellow tinged with fulvous, posterior coxae black behind, 

 as well as base of their trochanters, tips of their tibiaa and of the tarsi dusky; 

 tibiae with numerous short acute spines; tarsal claws pectinate; abdomen 

 subpetiolate, long, narrow, subconvex, smooth and shining, the apical margins 

 of all the segments above, rather broadly white; first segment with the stig- 

 matic tubercles prominent and situate a little before the middle. Length 3J 

 lines. 



Hah. — Connecticut. (Coll. Mr. E.Norton.) One "J, specimen. 



M. decens. — %. Black, shining, finely pubescent; face, cheeks beneath, cly- 

 peus, mandibles except tips, and palpi white; antennae as long as the body, 

 slender, brown-black above, testaceous beneath, the scape beneath and some- 

 times the base of flagellum beneath, whitish; line on collar, a large cuneiform 



