148 TRANS. ST. LOUIS ACAD. SCIENCE. 



located, CD wt-ll forwards on its vein, and E nearer to the areo- 

 let than to the crook of its vein, as in Exetastes. 



leptobatus illinoiensis, n. sp. — 9. — Black. Head subopaque, with 

 verj minute, rather dense punctures, obsolete towards the tip of the cXy- 

 peus. A small, hunched, longitudinally oval tubercle on the disk of the 

 face, polished on its tip. Clypeus, except its extreme base, and a lateral 

 dot on the vertex adjoining the eye, pale luteous. Palpi blackish. An- 

 tennae brown-black, § as long as the body, rather convolute at tip ; ist 

 joint of the flagellum 4^ times as long as wide; the 2d joint \ as long as 

 the 1st; the rest very gradually shorter. Thorax subpolished, with mi- 

 TJUte, rather dense punctures. Pleura of metathorax finely, its notum 

 rather coarsely, rugoso-punctate ; its carinje entirely obsolete. Tegulje, a 

 -short, slender line under the front wing, a very broad line overlying the 

 iiumeral suture nearly to its tip and connecting from its tip with a pair 

 of transversely arranged, discoidal spots on the mesonotum byavittaonly 

 \ as wide as either the line or the spot, and the sides (but not tip) of the 

 scutel, all yellowish-white. Abdomen glabrous and polished, arched near- 

 ly in a quadrant, pale rufous except the basal | of joint i. Joint i geni- 

 culate 5 of the way to its tip, twice as long as wide, twice as wide behind 

 as before, its sides straight save that the spiraculiferous tubercle projects 

 slightly \ of the way to its tip ; carina; only represented by a shallow, oval 

 excavation before the geniculation, and an abbreviated, narrow, shallow, 

 longitudinal one behind it. Joints 2, 3 and 5 about square ; 2 with a small, 

 subbasal, lateral tubercle. Joint 4 rather longer than wide, owing to the 

 •compression of the tip of the abdomen; 6 short; the rest retracted above, 

 but obliquely a little exserted below. Venter basally blackish, terminally 

 rufous, basally excavated, ttrminally protuberant, longitudinally carinate 

 throughout; joint 6 projecting far beyond the dorsal tip of the 6th dorsal, 

 so that, when seen in profile, the tip of the abdomen is obliquely truncate 

 in an angle of 45°. Ovipositor dark rufous, nearly \ as long as the body ; 

 sheaths black, not tapered, rather wider than the last tarsal joint of the 

 hind legs. Legs black; the 4 front legs with the superior surface of the 

 femora, the whole of their tibiae and tarsi, and an elongate spot on the an- 

 terior tip of the anterior coxae, all pale luteous. Hind legs with the supe- 

 rior surface of their femora, except basally, pale luteous ; tibiie and tarsi 

 pale luteous, with the inferior surface of the tibia; and of the i st tarsal joint 

 fuscous. Wings hyaline, tinged with smoky yellow. Veins black ; stigma 

 black, its basal J whitish. Radial area elongate. Areolet rhomboidal, the 

 side facing the apex of the wing a litttle convex externally, and \ longer 

 than the other 3 which are equal. First recurrent vein crooked, but with- 

 out any stump of a vein at the crook; the 2d subobsoletely biangulated, 

 its bulla occupying nearly the whole 2 sides of the salient angle. Length 

 $ .43 inch. Front wing $ .33 inch. Ovipos. .13 inch. 



One S ; $ unknown to me. The first N. A. species hitherto 

 described. But for the black mandibles, the blackish palpi, and 



