264 [September 



ous on the face ; mandibles except tips, and the palpi, pale yellow ; 

 antennae two-thirds the length of the body, blackish at base, dull rufous 

 towards the tip, basal joint beneath yellow; tegulfe pale yellowish ; 

 elevated lines on metathorax not well defined, the central area rather 

 large, elongate. Wings hyaline, iridescent; nervures and stigma pale 

 fuscous, the former yellowish at base; areolet small, subtriangular, 

 oblique, petiolated. Legs pale rufous, the four anterior coxae, all the 

 trochanters, extreme base of the tibiae and most of the tarsi, yellowish ; 

 posterior tibife and tarsi obfuscated at tips. Abdomen elongate, sub- 

 compressed, broad at tip, rufous ; the first, most of the 2nd, extreme 

 base of the 3rd and the two or three apical segments, black ; beneath 

 tinged with yellowish ; ovipositor subexserted. Length 3^ lines ; ex- 

 panse of wings 5 lines. 



Hah. — Pennsylvania. E. T. Cresson. 



Closely allied to M. Oxylus and M. affinis, but is larger and easily 

 distinguished by the basal joint of the antennae being yellow be- 

 neath. 



14. Mesoleptus subrubidus. n. sp. 



Bliiek ; spot on inaixiililes, palpi, tegulfe and trochanters, pale yellowish; 

 wings hyaline, areolet triangular, petiolated; legs and abdomen except base, 

 rufous. 



Male. — Black, clothed with a thin, pale, glittering pubescence ; spot 

 on each mandible and the palpi, pale yellowish; antennae porrect, as 

 long as the body, entirely black ; tegulae pale yellowish ; metathorax 

 with the elevated lines tolerably distinct, the central area large, sub- 

 quadrate. Wings very faintly tinged with fuscous, iridescent ; nervures 

 and stigma fuscous, the former yellowish at base ; areolet small, trian- 

 gular, petiolated. Legs rufous; the four anterior coxae and all the 

 trochanters beneath, pale yellowish : posterior coxae, except tips, black. 

 Abdomen long, slender at base and gradually thickened towards the 

 tip which is subcylindric, shining, rufous, the first, second except tip 

 and the extreme base of the third segments, black ; apex sometimes 

 .slightly obfuscated. Length Bh lines; expanse of wings 5 lines. 



Hub. — New Jersey (Cresson) ; Illinois (Dr. Lewis). 

 Resembles M. Oxylus in coloring, but is much larger, more elongate 

 and slenderer. 



