1864.] 265 



15. Mesoleptus? dimidiatus, n. sp. 



Black; mouth and tegulse yellowish; legs and middle of abdomen pale ru- 

 fous ; venter yellowish; wings hyaline, areolet minute, oblique, petiolated ; 

 ovipositor long. 



Female. — Black, shining, slightly pubescent ; most of mandibles and 

 the palpi, yellowish ; antennae two-thirds the length of the body, black, 

 the basal joint beneath dull yellow ; tegulae pale-yellowish ; meta thorax 

 slightly sulcate behind ajid somewhat transversely aciculate, the elevated 

 lines well deffned, the central area rather large, pentangular, the lower 

 portion open. Wings hyaline, slightly iridescent, nervures and stigma 

 blackish, pale at base; areolet minute, oblique and petiolated. Legs 

 pale rufous, the tarsi paler, obfuscated at tip, the posterior coxae black. 

 Abdomen robust, subfusiform, slender at base, broad and subcompressed 

 at the apex ; first segment dilated at tip, the peduncle slender ; apex 

 of the 1st, the whole of the 2nd and the base of the ord segments, pale 

 rufous ; remaining segments black ; ventral segments yellowish ; ovipo- 

 sitor as long as the abdomen, rufo-piceous. Length 3^ lines; expanse 

 of wings 5^ lines. 



Hah. — Illinois. Dr. Samuel Lewis. 



This may not belong to Mesohptus on account of its long ovipositor ; 

 otherwise it has the characters of that genus. 



16. Mesoleptus decoloratus, n. sp. 



Black ; face, legs and middle of abdomen obscure yellowish-red ; wings hya- 

 line, areolet triangular ; abdomen clavate. 



Male. — Black, slightly pubescent; face beneath the antennas, clypeus 

 and mouth, obscure testaceous ; antennae very slender, longer than the 

 body, rufo-fuscous, pale at base ; tegulae and a minute spot before the 

 wings, pale yellowish ; metathorax with the elevated lines tolerably dis- 

 tinct, the central area elongate. Wings ample, hyaline, iridescent ; ner- 

 vures and stigma fuscous, pale yellowish at base ; areolet triangular. 

 Legs pale rufous, the tarsi paler. Abdomen slightly petiolated, clavate, 

 dull yellowish-red, the basal segment, except tip, and the two or three 

 apical segments black, the second segment sometimes obfuscated on its 

 basal half. Length 3f lines ; expanse of wings 6 lines. 



Hah. — Illinois. Dr. Samuel Lewis. 



Resembles M? dimidiatus much in coloration, but the antennae and 

 wings are half again as long, and the abdomen diiferently shaped. 



