100 E. T. CRESSOX. 



pubescent, and becoming gradually shorter to the tips; metathorax short, with 

 sharply defined longitudinal carinse, the two central ones subparallel, slightly 

 diverging posteriorly, the channel between them with carina across the middle ; 

 tegulse pale yellow; wings ample, hyaline, iridescent, areolet small, subtriangu- 

 lar and petiolated ; legs shorter and stouter than usual, color of the body, the 

 two anterior pairs paler; abdomen elongate, subparellel, subdepressed. petiola- 

 ted, the petiole tolerably slender and deeply channeled, the apex dilated, with 

 two sharp earinse on the middle, becoming obsolete before reaching the apex of 

 the segment, the lateral margin carinate, as well as that at the base of the second 

 segment. Length 4i lines. 



Hah. — New Jersey. One % specimen. 



M. eximius. — % ■ Elongate, slender, parallel, pale honey-yellow ; head trans- 

 versely subquadrate; black, broad orbits, interrupted behind the summit of 

 eyes and deeply indented on each side behind antennse, the face, clypeus, mandi- 

 bles except tips, and palpi, white; antennte slender, pubescent, black, shading 

 into yellowish beyond the middle, the scape white beneath; prothorax black, 

 with the anterior and posterior margins white beneath with a white spot iu front 

 of each anterior coxae; mesothorax black, with a white spot on the disk; scu- 

 tellum and post-scutellum white, the region on each side of the former black ; 

 pleura black on the anterior margin and beneath, honey-yellow and white on 

 the sides, a white oblique line on each side beneath ; tegulee and a curved line 

 beneath white; metathorax honey-yellow, pubescent, transversely ruguiose ; 

 wings hyaline, iridescent, nervures pale brown, areolet wanting; leg.^ slender, 

 honey -yellow, the four anterior coxae and trochanters white, posterior tibite and 

 tarsi slightly dusky; abdomen long, slender, narrow, petiolated, pubescent, 

 basal segment slender, slightly dilated at tip, stigmatic tubercles indistinct. 

 Length 4i lines. 



Ilab. — Connecticut. (Coll. Mr. E. Norton.) One ^ specimen. 



M. facetus. — %. Slender, subpubescent, shining, black, clypeus and mandi- 

 bles reddish, pubescent; palpi very long and slender, white, blackish at base; 

 antennse long and slender, opaque black, with a broad white annulus a little 

 beyond the middle, scape beneath reddish ; thorax gibbous, scutellum obtusely 

 elevated, brownish, as well as the post-scutellum ; metathorax obsoletely stained 

 on the middle and sides with luteous, with distinct elevated lines, forming on 

 the disk an elongate central area; tegulse palish; wings hyaline, beautifully 

 iridescent, nervures brown, areolet moderately large, triangular; legs slender, 

 pale luteous, with blackish stains on the coxse and four anterior femora above, 

 posterior legs black, their tarsi pale, tips of all the tarsi dusky ; abdomen slen- 

 der, petiolated, subdepressed, first segment long and slender, only slightly di- 

 lated at tip, stigmatic tubercles obsolete ; tip of first segment, most of second and 

 third, and base of fourth segment, obscure yellowish, more or less varied with 

 blackish. Length 3 lines. 



Hab. — West Virginia. (Ridings.) One %, specimen. 



M. albocollaris. — 9. Long, slender, black, eyes large and prominent, front 

 deeply excavate behind the antennae; anterior orbits, not reaching the summit 

 of eyes, face, clypeus, mandibles, space beneath eyes, and the palpi, white; an- 

 tennse as long as the body, slender, black, scape large, globose, white, dusky 

 above; collar, tegulse and a large mark before, white; scutellum piceous ; meta- 

 thorax smooth and shining; pleura fulvous, somewhat varied with white, a 



