1865.] 261 



Genus MESOLEPTUS, Grav. 



1. Mesoleptus valens. n. sp. 



Black; most of mandibles, palpi, tegulse and most of tibiae and tarsi, yellow- 

 ish: femora and basal half of abdomen, rufous; wings hyaline. 



Female,. — Large, black, thinly clothed with a very short pale pube- 

 scence ; face finely rugose ; mandibles yellowish, black at tips which 

 are deeply cleft; palpi yellowish; antennas more than half the length 

 of the body, entirely black. Thorax finely punctured, subsericeous. 

 shining; scutellum subconvex, deeply excavated in front; metathorax 

 rugose, with a deep central excavation posteriorly, the elevated lines 

 not well defined ; tegulae yellow. Wings hyaline, faintly tinged with 

 fuliginous; nervures fuscous, yellowish at base; areolet small, trian- 

 gular, subpetiolated. Legs yellowish ; coxae, tips of the posterior tibiae, 

 the apical half of the basal joint of their tarsi, and the remaining joints 

 of their tarsi except extreme base, blackish ; the four anterior femora 

 tinged with ferruginous and the posterior pair entirely ferruginous. 

 Abdomen elongate, slender at base and robust at tip, smooth and pol- 

 ished, black ; basal segment slender at base, much swollen at tip, arcu- 

 ated, its apical half, as well as the whole of the second and third seg- 

 ments, rufous; apex slightly pubescent; venter yellowish at base; 

 ovipositor exserted about the length of the first segment, piccous, fer- 

 ruginous at tip, valves black. Length 4| lines; expanse of wings 7 

 lines. 



One specimen. 



2. Mesoleptus montanus, n. sp. 



Black; legs rufous, four posterior tibiae and tarsi annulated with white; 

 wings hyaline, iridescent, areolet minute, petiolated ; basal segment of abdo- 

 men much dilated at tip ; ovipositor long. 



Female. — Black, somewhat shining, slightly pubescent, more dense 

 on the face; most of the mandibles, palpi and tegulae, yellowish-white ; 

 antennae piceous, more than half the length of the body; metathorax 

 deeply sulcate on the posterior middle, indistinctly striated transversely, 

 the elevated lines well defined, the central area not defined. Wings 

 hyaline, beautifully iridescent; nervures and stigma blackish, the for- 

 mer pale at base ; areolet minute, subtriangular and petiolated. Legs 

 pale rufous ; the coxae, posterior trochanters, and extreme tips of pos- 

 terior femora, black ; anterior legs pale in front; the four posterior 

 tibiae and tarsi blackish, the tibiae with a broad exterior white line be- 

 tween the base and middle, and a white spot at extreme base, and the 

 base of the tarsal joints also white. Abdomen rather robust, subfusi- 

 form, entirely black; first segment slender at base and much swollen 

 at tip ; apical segments broad and faintly subcompressed ; ovipositor 



