262 [April 



exserted nearly the whole length of the abdomen, rufo-piceous. Length 

 IJ.) lines; expanse of wings 5t lines. 



One specimen. Very closely allied to M. valuing from Pennsylvania, 

 but is smaller, the areolet of the wings differently shaped and the legs 

 somewhat differently colored. 



:'». Mesoleptus macer. n. sp. 



Black; mandibles and tegulse yellowish; legs ferruginous; wings hyaline, 

 areolet minute, petiolated; abdomen subcompressed ; ovipositor long. 



Female. — Slender, black, somewhat shining, closely and finely punc- 

 tured, slightly pubescent ; most of the mandibles, palpi, and the tegulae, 

 pale yellowish ; antennae two-thirds the length of the body, slender, 

 curled at tips, entirely black ; metathorax subrugose, the elevated lines 

 sharply defined, the central area small and triangular. Wings hyaline, 

 beautifully iridescent ; nervures and stigma blackish, the former yel- 

 lowish at base; areolet minute, slightly oblique and petiolated. Legs 

 slender, obscure ferruginous, the two anterior pairs tinged with yellow- 

 ish, the posterior pair with dusky ; coxaa and posterior trochanters 

 piceous. Abdomen elongate, slender at base, gradually broader and 

 subcompressed towards the tip, entirely black ; tip of the first segment 

 swollen ; venter tinged with obscure yellowish ; ovipositor exserted about 

 half the length of the abdomen, rufo-piceous, valves black. Length 3 

 lines; expanse of wings 4-1 lines. 



One specimen. Allied to M. dubitatus, but the abdomen is entirely 

 black, and the form more slender. 



Genus CTENISCUS, Haliday. 

 1. Cteniscus excelsus, n. sp. 



Black; most of the head and antennae, four stripes on mesothorax, spots on 

 pleura, scutellums, two spots on metathorax, legs and bands on abdomen, white 

 or yellowish-white ; wings hyaline ; abdomen clavate. 



Female. — Black ; the face, broad frontal orbits, dilated at the sum- 

 mit, a small spot behind the eyes, lower half of the cheeks, clypeus, 

 mandibles except extreme tips, and the palpi, white, slightly tinged 

 with yellowish ; cheeks with a well defined longitudinal carina on each 

 side ; a minute black puncture on each side of the face immediately 

 above the clypeus ; antennae two-thirds the length of the body, slender, 

 filiform, pale yellowish, blackish towards the base, especially above ; 

 basal joint beneath yellowish-white. Thorax shining, minutely punc- 

 tured, clothed with a thin pale pubescence ; mesothorax polished, ini- 

 punctured; upper and lower margins of the prothorax, dilated above, 

 the pectus in front of the anterior coxae entirely, a spot beneath the 

 tegulse, an irregular mark on each side of the pleura, enclosing a black 



