309. 

 PLATYGASTER BOSCII. 



Order Hymenoptera. Fam. Proctotrupidae Noh. 



Oxyuri Lat. 



Type of the Genus, Scelio ruficornis hat. 



Platygaster Lat., Curt. — Scelio Lat. — Ichneumon Kirhy — Psilus 



Jur. 



AntenncE inserted close to the base of the clypeus, as long as the 

 thorax, geniculated, lO-jointed, basal joint very long and rather 

 robust, 2nd and 3rd of equal length, the former oval, the latter 

 oblong, 4th shorter, 5th and 6th small cup-shaped, the remainder 

 forming a distinctly articulated club, 7th joint cup-shaped, 8th 

 and 9th subquadrate, 10th subovate (1), 

 Labrum undiscovered. 



Mandibles curved, broad and bifid at the apex (3). 

 Maxilla with the basal portion large scutiform and corneous, 

 terminated by a membranous ovate lobe, thickened and rather 

 pilose externally. Palpi inserted at the base of the lobe and ex- 

 tending a little beyond it, linear and biarticulate j basal joint 

 short, 2nd considerably longer producing 2 bristles at the apex(-4). 

 Mentum obconic, terminated by a broad membranous Labium, 

 at the base of which on each side rise the Palpi, they are short 

 and formed of one elongate-ovate joint, furnished with one or 

 two bristles (5). 

 Head transverse, suborbicular, concave behind. Eyes lateral and 

 not very prominent. Ocelli 3. Thorax subovate. Scutellum inu- 

 cronate, or obtuse and tuber culiform. Abdomen somewhat de- 

 pressed, spathuliform, considerably narrowed at the base, some- 

 times acute at the apex; composed of ^ or 7 joints, the 2nd being 

 more than equal in size to the remainder. Wings without nervures, 

 or at most with a short subcostal one. Legs generally slender. 

 Thighs clavate. Tibiae clavate and spurred at the apex ; anterior 

 with a curved membranous and- bifid spine at the apex. Tarsi 

 5 -jointed, basal joint long. Pulvilli as long or longer than the 

 Claws (8). 

 Obs. All the dissections were drawn from P. Boscii. 



Boscii Jur. Hym. p. 318. Curtis's Guide, Gen. 585. n. 16. 



Black smooth and shining. Antennae with the 2nd joint brown. 

 Head hollow on the crown. Ocelli remote. Thorax ovate. Scu- 

 tellum obtuse. Abdomen very glossy, ovate-lanceolate (6), with 

 a long horn (6) produced at the base and curved over the thorax 

 as far as the head, upon which it can rest, striated, especially 

 towards the base (a), 2nd joint fiat in the centre and channelled 

 at the base and on the sides which are thickened. Wings very 

 pubescent and iridescent, superior with a short nervure at the 

 base, not touching the costa, clubbed at the apex. Base and 

 apex of the tibiae and the tarsi subferruginous. 

 In the Author's and other Cabinets. 



