15* TRANS. ST. LOUIS ACAD. SCIENCE. 



distinct bullae, C, D, and E, besides a semi-bulla representing the 

 bulla B opposite the anterior tip of the 2d recurrent vein, which 

 semi-bulla is always indistinct but never entirely absent. ^C and D 

 are wide apart, the 2d recurrent vein being convex externally, and 

 E is pretty close to the angle of its vein, which is angulated at 

 about 135°. Brulld says that the tarsal claws are bifid : Latreille 

 does not so state, and they are certainly simple in both sexes in 

 my species. He says also that the ist joint of the antennae is 

 truncate obliquely below ; it is truncate laterally in my species. 



Acoenites rapinsulensis, [Walsh, Trans. Am. Ent. Soc. iii. p. 144]— 

 $. — Rufous. Head subopaque, with dense, rather fine, shallow punctures, 

 sparse on the subpolished vertex and clypeus. Orbits, except above, tinged 

 with yellow; tips of the mandibles, orbits of the ocelli, and a quadrate 

 space above the organ of the antennre and extending to the ocelli, all black. 

 Antennae \ as long as the body, very robust; joint i of the fiagellum twice 

 as long as wide, 2-6 gradually shorter till 6 is square; the rest slowly 

 shorter and shorter. Thorax subpolished, with dense, rather fine, shal- 

 low punctures, finer and more sparse on the notum ; the disk of the meso- 

 thoracic pleura glabrous and highly polished. Metathorax above rather 

 finely rugose ; the normal carinate areas all present, save that the central 

 is confiuent with the lunate area, which last is glabrous and polished. 

 Scutel tinged with yellow. Inferior angle of the collare, and edges of the 

 4 front acetabula, black. Abdomen obovate, polished, with sparse, almost 

 microscopic punctures. Joint i, 2J times as long as wide, 2 J times as wide 

 behind as before, its sides nearly straight save that the tubercle forms a 

 gentle convexity on their middle; carinre obsolete except at the extreme 

 base ; a small, transverse, lateral fovea in the terminal suture. Joint a 

 wider by i than long; the rest gradually shorter. Venter basally tinged 

 with yellow, more or less excavated, and always longitudinally carinate; 

 joint 6 elongate semiconical, more or less projecting beyond the tip of the 

 dorsal joints as they are more or less retracted. Ovipositor as long a» 

 the body, piceo-rufous ; sheaths brown-black, rufous at tip, not tapered, 

 basally \ as wide as the last tarsal joint of the hmd leg, and on their ter- 

 minal i expanded to full as wide. Legs rufous. Four front legs with 

 their tibiae and tarsi tinged with yellow. Femora of the hind legs with 

 their basal sutures, and a cloudy spot under their tip, black. Wings sub- 

 hyaline, the terminal edge clouded with dusky. Veins black; stigma ru- 

 fous, edged behind with black. Radial area rather elongate, its posterior 

 angle 135°. Length § .32-.35 inch. Front wing $ .30-.3J inch. Ovipos. 

 •30--33 inch. 



The cf differs from $ only as follows : — i. The face, orbits up to the 

 ocelli, cheeks, clypeus, and mandibles except their black tips, are all yel- 

 low. 2. The antennae are full } as long as the body, and the joints slightly 

 more elongate. Joint 1 yellowish beneath. 3. The collare is immaculate 

 and the scutel yellow. 4. The abdomen, as usual, is narrower, 5} or 6 



