268 [September 



ginoiis, iridescent ; nervures aud stigma black ; areolet subtriaiiiiular, 

 minute, petiolated. Legs rufo-piceous, the anterior pair paler; coxae, 

 trochanters and most of the four posterior femora, black ; posterior tarsi 

 blackish. Abdomen long, slender, subcylindric, shining, dull rufous, 

 except the basal segment ; apex not compressed ; sometimes the two 

 apical segments are obfuscated. Length 3 2 lines; expanse of wings 

 5 lines. 



Hab. — Illinois. Dr. Samuel Lewis. 



This may be the male of M. nigripes. 



22. Mesoleptus vicinus. n. sp. 



Black ; mandibles, paljji and tegulse, pale yellowish : legs and abdomen ex- 

 cept base, rufous; wings hyaline, areolet triangular, petiolated. 



Female. — Black, thinly clothed with a pale glittering pubescence ; 

 most of mandibles and the palpi, yellowish ; antennae three-fourths the 

 length of the body, black ; tegulae yellowish ; metathorax with the ele- 

 vated lines well defined, the central area subquadrate. Wings almost 

 hyaline, iridescent; nervures and stigma testaceous, the former much 

 paler at base; areolet small, subtriangular, petiolated. Legs rufous, 

 the trochanters yellowish, the posterior coxae piceous. Abdomen elon- 

 gate, slender at base, gradually thickened and subcompressed towards 

 the apex ; rufous, the first and second segments except their tips, black ; 

 beneath, slightly tinged with yellowish ; ovipositor rufous, exserted 

 about one line. Length So lines; expanse of wings 5 lines. 



Hab. — New Jersey. E. T. Cresson. 



Resembles M. hostilis, but is more robust, and the legs are almost 

 entirely rufous. 



2.3. Mesoleptus vultus, n. sp. 



Black ; face, palpi, basal joint of antennae beneath, tegulse and four anterior 

 coxae and trochanters, pale yellowish : legs and apex of the four basal segments 

 of the abdomen, pale rufous ; wings hyaline, areolet 5-angular. 



Male. — Black, shining ; face, clypeus, mandibles and palpi, pale yel- 

 lowish ; antennae porrect, about as long as the body, piceous, the basal 

 joint beneath, pale yellowish, the apical joints beneath tinged with ru- 

 fous. Thorax polished ; tegulae and a spot before the fore-wings, pale 

 yellowish ; the elevated lines on the metathorax tolerably well defined, 

 the central area moderate, subrotundate. Wings hyaline, iridescent ; 

 nervures and stigma fuscous, the former pale at base ; areolet 5-angular. 



