154 TRANS. ST. LOUIS ACAD. SCIENCE. 



by its areolet not being large and rhomboidal. From Leptobatus and 

 Exetastes it differs by the "anus being slit," by the pectinate claws, 

 and by the areolet not being large and rhomboidal ; and from the 

 former, in addition, by the 6th ventral ? not being prolonged. 

 From Colsocentrus it seems to differ only by the much shorter ovi- 

 positor and the 6th ventral ? not being enormously prolonged, 

 and by the pectinate claws. In coloration it partly resembles 

 Arotes, but it is separated at once from Arotes, Tropistes, and Acce- 

 nites, by the pectinate claws and by the areolet not being obsolete. 

 I know of no other Ichneumonidous genus where the tibia are 

 thorned except Labena. 



[PhytOdietUS vulgaris, Cress., Trans. Am. Ent. Soc. iii. p. 166.]— £.— 

 Black. Head subopaque, with very minute, dense punctures, sparse on 

 the subpolished vertex. Mandibles, except their teeth, palpi, and a short 

 line on the vertex adjoining the eye, all white. Antenna; full as long as 

 the body, brown-black, rufous beneath towards their tips; adjoint of the 

 scapus and ist of the flagellum white exteriorly; ist joint of the flagellum 

 4 times as long as wide, the next joint \ shorter, the following ones very 

 slowly shorter and shorter. Thorax opaque above, subopaque beneath, 

 with almost microscopic punctures somewhat coarser on the metathorax; 

 carina; of metathorax only represented by a shallow, obtuse, dorsal stria 

 fading out towards the tip. Tegulae, a spot under the front wing, a spot 

 under the humeral suture in front of the tegula, and a more or less cla- 

 vate line above it reaching more or less nearly to its tip, a pair of small 

 spots transversely arranged on the disk of the mesonotum, tip and sidps 

 of the scutel or sometimes only the basal § of its sides besides the tip, the 

 whole of the metathoracic scutel, a capillary line leading from either scu- 

 tel respectively to the front and hind origin of the hind wing, and near 

 the tip of the metathorax a lunate band, broad at each end, and in the mid- 

 dle very broad and advanced forwards in an angle the apex of which is 

 bifid, all white. Lower face of the mesosternum and meso- and meta- 

 thoracic pleura halfway to either wing, pale bright rufous. Abdomen 

 polished, with very minute but not sparse punctures. Joint i longer by i 

 than wide, z\ times wider behind than before, its sides straight or scarcely 

 convex; carina; only represented by a triangular excavation on the basal 

 \. A small, transverse, lateral fovea cutting off the acutely prominent an- 

 terior angle of joint 2 so as to simulate a continuation of the suture. Joint 

 2, f as long as i, and \ wider than long. A white line on the tip of joints 

 1-7, narrower on the hindmost of them. Venter blackish, the base of joint 

 1 and the tips of 1-6 all whitish. Ovipositor as long as the abdomen, 

 piceo-rufous ; sheaths black, finely pubescent, not tapered, as wide as the 

 last tarsal joint of the hind legs. Legs pale rufous. Front legs with the 

 coxae, both trochanters, knees, tibia;, and tarsi, white, the tibia' exteriorly 

 infuscated. Middle legs with the tip of the ist and the whole of the 2d 

 trochanter, broad knees, tibia', and tarsi, all white, the femora obfuscated 



