262 [September 



the second except its apical margin, and a large spot on the disk of all 

 the following segments, black, sometimes the apical segments are obfus- 

 cated and the black spots indistinctly defined ; apex not compressed ; 

 beneath pale rufous. Length 2^ — 3 lines ; expanse of wings 3^ — 4 

 lines. 



Hah. — Illinois. Dr. Samuel Lewis. 



10. Mesoleptus conjunctus, n. sp. 



Black : mouth, tegulse and venter, pale yellowish ; legs pale fulvous, poste- 

 rior tibise with a faint whitish annulus ; wings hyaline, areolet triangular, 

 petiolated ; apex of the 2nd and 3rd, and sides of the two following abdominal 

 segments, rufous. 



% 9 • — Black ; most of mandibles and the palpi, yellowish ; antennae 

 two-thirds the length of the body in the $ , and as long as the body in 

 the % , entirely black ; tegulae yellowish ; metathorax with the elevated 

 lines not well defined, the central area moderate, subquadrate. Wings 

 hyaline, iridescent ; nervures and stigma pale fuscous, paler at base ; 

 areolet triangular, petiolated. Legs pale fulvous, the four anterior 

 coxae black, their tibiae blackish, with a broad obscure, whitish annulus 

 in the middle, their tarsi obfuscated. Abdomen subfusiform, black, 

 slender at base, broad and compressed at tip ; basal segment slightly 

 dilated at tip; apical margins of the 2nd and 3rd, and the sides of the 

 two following segments, rufous ; ventral segments yellowish, spotted 

 with black towards the apex ; ovipositor of the 9 exserted about one 

 line. Length 2^ lines ; expanse of wings 4 lines. 



Hah. — Illinois. Dr. Samuel Lewis. 



Allied to M. arc/enti/rons, but easily distinguished by the much larger 

 areolet of the wings, and the different coloration of the legs and abdomen. 



11. Mesoleptus Ozylus, n. sp. 



Black ; si^ot on mandibles, palpi, tegulse and base of four anterior legs, yel- 

 low; wings hyaline, areolet small, triangular, petiolated; legs and middle of 

 the abdomen, rufous. 



Female. — Black; face and thorax with a slight silvery pubescence; 

 a spot on each mandible and the palpi, pale yellowish ; antennae three- 

 fourths the length of the body, black, the base beneath piceous. Tho- 

 rax black, the tegulae pale yellowish, the elevated lines on the metatho- 

 rax well defined, the central area elongate, moderate, five or six-sided. 

 Wings hyaline, iridescent; nervures pale fuscous, stigma and costa 

 pale testaceous ; areolet small, triangular, petiolated. Legs pale rufous, 



