124 TRANS. ST. LOUIS ACAD. SCIENCE. 



suture, usually extending nearly to its tip and robustly clavate at base^ 

 occasionally extending only halfway to its tip, and a terminal quadran- 

 gular spot on the scutel, all white. Abdomen ^ubopaque, rather coarsely 

 punctate, polished and subglabrous towards the tip. Joint i longer by ^ 

 than broad and ^ wider behind than before, with the two usual carinse 

 lofty on the basal }, thence subobsolete. Ovipositor scarcely ij as long as 

 the body, rufous, darker at base ; sheaths black, gradually and slowly ta- 

 pered, about as wide at base as the last tarsal joint of the hind leg. Venter 

 whitish, sometimes blackish towards the tip. Legs pale bright rufou8» 

 the anterior coxa; very rarely blotched with white in front. Hind legs with 

 the terminal i or sometimes \ or occasionally i of the tibia' gradually 

 black; tarsi black; extreme tip of the femora very rarely fuscous. Wings 

 subhyaline tinged with smoky yellow; veins black; stigma dark rufous 

 edged with black, sometimes all black; 2d recurrent vein distinctly bian- 

 gulated. Length $ .37-.40 inch. Front wing $ •3I--34 inch. Ovipo8» 

 .26-. 28 inch. 



Fourteen ? ; S unknown to me. Distinguishable from vari' 

 pes^ Cress., and from all other species here described but albi- 

 scutellaris by its white scutel, and from that by its hind legs not 

 being annulate with black and white. 



Section 2. — Hind legs multlannualate vith black and 

 white. Abdomen and clypeus black. 



dllypta tiiberculifrons, [Walsh, Trans. Am. Ent. Soc. iii. p. 152.]— c? ?. 

 — Differ from simplictpes only as follows : — i. The tubercle on the face is 

 large and obvious, varying in prominence but generally semicircular on 

 a profile view, its tip always polished and sparsely punctate. 2. The cly- 

 peus and mandibles are entirely black, the clypeus with a small, subpol- 

 ished, flattish tubercle on the middle of its anterior edge. 3. The thorax 

 is subpolished and less strongly sculptured. The white line under the 

 humeral suture never extends further than halfway to the tip, and some- 

 times less, the scutel is immaculate, and the metathoracic pleura where it 

 adjoins the coxa is always rufous for a small space. 4. The venter is more 

 generally blackish. 5. The ovipositor is proportionally a little shorter, 

 and the sheaths are basally 1^-2 times as wide as the last tar^al joint of 

 the hind leg, and much more suddenly tapered. 6. The legs are pale 

 bright rufous, but in the front legs the coxie and both trochanters are 

 white, the coxic and basal trochanters sometimes lightly spotted, or very 

 rarely, and in $ only blotched strongly, with rufous. In the middle leg 

 the 2d trochanter is white, the tibia has its basal \ whitish and its extreme 

 tip black, the intervening space rufous internally and externally whitish, 

 with a pale dusky semi-fascia at the basal end ; tarsi white, tips of all the 

 joints dusky. In the hind leg the terminal \ of the femur is black, the 

 tibisc are white with their 2d and terminal \ black, anclRthe tarsi are black 

 with the basal i-^ of joints 1-3 white. Spurs of 4 hind legs white tipped 

 with black. 7. The stigma is black, the base and occasionally the tip dull 



