150 TRANS. ST. LOUIS ACAD. SCIENCE. 



sternum, a triangular spot on the anterior lateral margin of the collare, and 

 another in front of each anterior coxa, all white. Abdomen glabrous and 

 polished. Joint 1 narrower at tip by \ than the base of joint 2, 3^ times 

 as long as wide, 2k times as wide at tip as at base, its sides straight and 

 scarcely convergent halfway from the tip to the base, where the spiraculi- 

 ferous tubercle is placed, thence gently concave to near the base, the nar- 

 rowest part of the joint being f of the way from the tip to the base; the 

 carina; only represented by a small, shallow, basal excavation. Joint 2 

 slightly shorter than wide; 3-8 slowly shorter and shorter. Tips of the 

 joints with a white subequal band £ as long as joint 4, which on 1-3 does 

 not quite attain the extreme tip. Venter whitish; the 6th ventral elongate- 

 semiconical, full 3 times as long as wide, its tip and inferior edge obfus- 

 cated. Ovipositor piceo-rufous, as long as the body ; sheaths brown-black, 

 rufous at tip, slowly tapered, basally f as wide as the last tarsal joint of the 

 hind leg. The 4 front legs honey-yellow, with their coxa; and both tro- 

 chanters white, and their tarsi tinged with white; the 2d trochanter of the 

 middle leg blackish above. Hind legs pale bright rufous, with the coxa;, 

 the 2d trochanters, and the extreme tips of the femora, black ; the coxa; 

 superiorly and inferiorly white except at tip; the basal trochanters and the 

 tarsi white. Wings subhyaline, tinged with smoky yellow, with a large 

 fuscous spot occupying the apex. Veins black; stigma black, basally paler. 

 Radial area elongate. Length $ .60-. 64 (nearly .60' Say) inch. Front 

 wing ? -52-.54 inch. Ovipos. .60-. 63 inch. 



Two 9 , captured in South Illinois in June or July ; 6* unknown 

 to me. The ornamentation of the mesosternum in this and the 

 following species strongly recalls that of \Lampronota scutellaris, 

 Cress.], except that here the two prongs of the Y differ in thick- 

 ness as in the Roman Y. Differs from Say's brief description of 

 the 9 in the mandibles being basally white (not black immacu- 

 late) ; in the markings of the pleura beine as white as those of 

 the dorsum of the thorax (not yellowish) ; in the coxae and tro- 

 chanters of the 4 front legs being white (not honey-yellow) ; and 

 in the hind coxae not being " honey-yellow with 3 large yellow 

 spots" (! !) but black with 2 large white spots. From the pro- 

 miscuous way in which the items of Say's description are put 

 togtther, the thorax being described piecemeal in three different 

 places, it seems to have been drawn up in a hurry, and probably 

 the four differences noted above are not variations but mistakes. 

 The species is stated by Say to have been taken in Indiana, most 

 probably near his residence on the Wabash, only 100 miles N.E. 

 of the point where I took my specimens. Say describes the 6* 

 of what he supposes to be this species as differing from the ? in 

 having " prominent spines" on the metathorax. This is not a 



