136 TRANS. ST. LOUIS ACAD. SCIENCE. 



tex. Palpi whitish, basally pale rufous. Antennae I as long as the bodj^ 

 1st joint of flagellum 4^ times as long as wide, the scapus shining blacky 

 the flagellum, except the sutures which are black, pale brown-black above, 

 brownish-white below. Thorax polished, very finely and sparsely punc- 

 tate, much more closely on the subopaque mesonotum; parapsidal lines 

 distinct. Metathorax with the usual two carinae divergent and pretty dis-- 

 tinct as far as the posterior declivity, and the enclosed area as well as the 

 declivity highly polished ; its pleura with long, white pubescence. Tegu- 

 Ije a largish oval spot under the front wing, and another touching the 

 tegula under the humeral suture, a large quadrangular spot on the scutel 

 with a capillary line extending from its tip to the anterior origin of the 

 hind wing, and a transverse spot behind the scutel, all white. Abdomen 

 subopaque, finely and confluently punctate, subpolished behind and on 

 the tips of the joints, the usual tubercles subobsolete, and the extreme tip 

 of joints 2-7 or 3-7 pale sanguineous. Joint i terminally \ narrower thani 

 the base of 2, \ longer than wide, \ wider behind than before ; the two 

 carinae distinct to the tip, where they converge, but obtuse and not lofty 

 behind, and on their basal \ enclosing a polished, oval excavation. A 

 deep, subtri angular, lateral fovea in the suture between i and 2, occupying 

 full \ of the suture. Ovipositor black, not quite \ as long as the body, 

 with its tip hooked downwards; sheaths black, very finely pubescent, a. 

 little tapered, their basal part about as wide as the last tarsal joint of the 

 hind leg of a (5* of similar size. Venter blackish, the sutures widely whit-- 

 ish. Legs pale rufous. Front legs with the basal | of their coxae black, 

 and the knees, the inside of the tibiae, and the whole of the tarsi, whitish. 

 Middle legs with the knees, the tibiae except an exterior rufous vitta in- 

 terrupted on the second J, the spurs and the tarsi whitish. Hind legs with 

 the extreme tips of the femora and the basal and terminal \ of the tibiae- 

 black, the middle f of the tibiae and the spurs white; tarsi black, the ba- 

 sal \-\ of joints 1-3 white; joint 5 missing. Wings subhyaline, slightly 

 obfuscated at tip; veins black, radius pale rufous; stigma black, its basal 

 i white. Areolet rhomboidal. Bullae normal and distinct, C and D pretty 

 widely separated. Length $ .47 inch. Front wing $ .38 inch. Ovipos. 

 .18 inch. 



The ^ differs from 5 only as follows: — i. The entire face except the 

 terminal fovese, the clypeus, the mandibles except their teeth, and the 

 palpi, are white. The white orbits are continued to the occiput, but in- 

 terrupted opposite the ocelli by a space as long as they are themselves 

 wide. 2. The ist joint of the flagellum is only 3J times as long as wide, 

 and the scapus is brownish-white below. 3. There is sometimes a short, 

 whitish line in each parapsidal groove of the thorax opposite the teg^Ia.. 

 4. The front legs are entirely white, including the coxae and trochanters, 

 except that the femora are more or less rufous. Middle legs entirely 

 white, except more or less of the outer surface of the coxae, and the outer 

 surface and sometimes the whole of the femora. Hind legs the same as 

 in $, except that the basal \ of tarsal joint 4 sometimes, and always of 

 the missing 5th joint, is white. Length cT •37--4I inch. Front wing ^ 

 .30-.33 inch. 



