144 TRANS. ST. LOUIS ACAD. SCIENCE. 



don of the old genus. In Section i there are three bullae, C, D, 

 and E ; in Section 2 four, A, C, D, and E ; and in both cases C 

 and D are wide apart. 



Section i. — Areolet obsolete. 



Polysphincta nigriceps, n. sp.— c? $ .—Head black, subpolished, with 

 very fine, sparse punctures, and a longitudinal carina on the disk of the 

 face. Mandibles, except their extreme tip, and palpi, whitish. Antennae 

 brown-black, | as long as the body, joint 2 placed nearly at the tip of I 

 and larger than usual ; 1st joint of flagellum about 4 times as long as wide, 

 the scapus and one or two joints of the flagellum whitish beneath. Thorax 

 pale rufous, polished and glabrous, with the parapsidal grooves deeply 

 impressed, and the anterior lobe of the mesonotum very prominent; scu- 

 tel pale luteous. Tegulae, a contiguous spot before them, and a line under 

 the front wing, all whitish. Metathorax dark rufous with the pleura pale 

 Rufous, opaque and minutely rugoso-punctate, with 4 more or less distinct 

 longitudinal carinae, the two on each side confluent behind, and the two 

 outer ones 2J times further from the middle ones than these are from one 

 another. Abdomen subopaque, very minutely rugoso-punctate, subpol- 

 ished towards the tip and at the tips of the joints. Joint i longer by \ 

 than wide, I wider behind than before, its sides straight except that they 

 converge at the extreme base, the two carinae enclosing a shallow, tri- 

 angular excavation on the basal J, thence subsolete to the tip. Joints 1-5 

 with an obliquely transverse, impressed, lateral stria, rather beyond the 

 middle, and sloped the contrary way to those of Glypta. Joints 1-5 cf, 

 1-6$, dark rufous tipped with black; 2-5 stained with translucent clay- 

 yellow on basal \ cf, or basal J $ ; 6 and 7 cT? or 7 only $, entirely black. 

 Ovipositor exserted. twice as long as the abdomen is wide, and, as well 

 as its sheaths, black. Venter whitish, its tip black. Legs white; all the 

 6 femora, the 4 front tibiae, and the hind coxa;, pale rufous ; hind femora 

 with a terminal, superior, dusky vitta; hind tibiae with their second \ 

 dusky externally, and their terminal \ black all around; hind tarsi dusky 

 with their basal f-J of joints 1-5 gradually whitish. JF/«^j subhyaline; 

 veins black ; stigma pale dusky, ^ as long as wide. Radial area short, its 

 posterior angle aboiit 100°; the areolar cross-vein subobsolete, so that 

 the sides of the radial area almost decussate with the two adjoining veins. 

 Bullae 3, distinct but small ; A and B obsolete, C and D wide apart, C 

 placed well forwards, E § of the way to the angle of the ist recurrent vein. 

 Length S .15, ? .18 inch. Front wingcj" .13, 9 .15 inch. Ovipos. .03 inch. 



One % ; one $ . An elegant little species. 



Polysphincta nigrita, n. sp. — ^f -"I^iffers from the preceding ^^ only as 

 follows : — I. The thorax is black, except that the entire metathoracic pleu- 

 ra and the anterior and posterior margins of the metathoracic pleura are 

 rufous. Tegulai and a spot before them, a line under the front wing, and 

 the hind edge of the pleura of collare, all white. 2. The ist joint of the 

 abdomen is scarcely ; wider than behind than before, and its two carinse 



