388. 

 STILPNUS DRYADUM. 



Order Hymenoptera. Fam. Ichneumonidae. 



Type of the Genus, Stilpnus gagates Grav. 

 Stilpnus Grav., Curt., Hal. 



Antennce inserted between the eyes in front of the face, as long 

 as the thorax, rather stout, slightly thickened towards the apex, 

 pubescent and composed of 20 joints in the male and 16 in the 

 female (1), basal joint robust ovate, 2nd small globose, 3rd ge- 

 nerally the longest, slender, the 3 following rather longer than 

 the remainder which are ovate-quadrate, the terminal joint longer 

 and conical. 



Labriim with the basal portion semicircular, coriaceous and 

 ciliated, the centre membranous, ciliated and forming an elon- 

 gate triangle, articulated at the middle (2). 

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

 MaxillcE terminated by 2 suborbicular pubescent lobes, the in- 

 ternal one with the cilia very short, the external one pilose at 

 the apex. Palpi long and rather slender, composed of 5 hairy 

 joints, nearly of equal length and subclavate, the 2nd dilated on 

 the inside, 4th rather the shortest, 5th a little the longest and 

 linear (4). 



Mentum elongate obtrigonate. Lip distinct, hollow, pubescent 

 and slightly emarginate. Palpi much shorter than the maxillary, 

 pilose, 4-jointed, 1st and 2nd joints of equal length and rather 

 stout, the former clavate, the latter subovate, 3rd the smallest, 

 4th a little the longest, cylindric oval (5). 

 Head short transverse, face orbicular. Eyes rather prominent and oval. 

 Ocelli 3 in triangle (1*). Thorax oblong, obovate, gibbous. Scu- 

 tellum convex, semiovate. Wings ; anterior with a large triangular 

 stigma, a triangular marginal cell, not reaching the apex; areolet 

 small, pentagonal and scarcely closed on the furthest side, the 2 

 posterior cells united (9). Abdomen slightly depressed, narrower 

 than the thorax and somewhat linear or elliptical in the males (6 (J); 

 suborbicular and broader than the thorax in the females ; petiole 

 rather long and narrow, channelled and dilated posteriorly : ovipo- 

 sitor concealed. Legs more slender in the male than female : tibiae 

 a little dilated towards the apex and spurred: tarsi 5 -jointed, basal 

 joint the longest. Claws and Pulvilli distinct. 



Dryadum Haliday's MSS. Curtis's Guide, Gen. 488. n' 289*. 

 In the Cabinet of Mr. Haliday. 



This genus, Mr. Haliday says, seems more allied to Hemiteles 

 than to any of the other Ichneumonidse, indeed sometimes 

 they can only be distinguished by the areolet, or a little dif- 

 ference in the length of the aculeus. The males of Stilpnus 



