289. 



CH^iNON ANCEPS. 



Order Hymenoptera. Fam. Ichneumonidae Lat., Leach. 



Type of the Genus, Chaenon Anceps, Hal. 



Ch^non Hal, MSS., Curt. 



Antenna: inserted in the middle of the face, approximating, as 

 long as the body, nearly filiform, pubescent, composed of nume- 

 rous subquadrate joints, basal joint the most robust subovate- 

 truncate, 2nd very short, 3rd the longest (l*a), apical joint 

 obovate (b). 



Labrum small sublunulate and ciliated (2). 

 Mandibles remote, lateral divaricating not crossing subquadrate, 

 terminated by 4 unequal teeth (1 * & 3). 



Maxillce very small, terminated by a suborbicular and pilose lobe, 

 with a longer one inside. Palpi very long, pubescent and pi- 

 lose, 6-jointed, 1st and 2nd joints short, equal in size, 3rd the 

 most robust, the remainder slender, the 4th the longest, 5th and 

 6th of equal length (4). 



Mentum somewhat pear-shaped-truncate. Palpi long, rather 

 robust, and pilose, 4-jointed, the 2nd joint a little the longest 

 and stoutest, terminal one elongate-conic. Lip hollow, rounded, 

 scarcely broader than the mentum (5). 

 Head globose quadrate, face convex. Eyes remote, lateral. Ocelli 3, 

 large, forming a triangle on the crown of the head (l* front view of 

 the head). Thorax scarcely broader than the head, very much elon- 

 gated. Pustscutellum large semiorbicular. Abdomen elongate-ovate 

 narrowed at the base ; very much compressed beyond the middle in 

 the female type. Ovipositor scarcely visible. Wings rather long 

 and pubescent ; superior with 1 marginal, 2 submarginal and 2 dis- 

 coidal cells. Stigma slightly elongated. Inferior wings uith several 

 nervures. Legs, posterior the longest. Tibiae spurred. Tarsi 5- 

 jointed, basal joint the longest, 4th the shortest. Claws short. Pul- 

 villi large (8, afore leg). 



Anceps Hal. MSS. 



Black shining. Mandibles castaneous, black at the extremity. 

 Postpectus rugose, pilose, with a groove down the middle. Ab- 

 domen ochreons, with an abbreviated black mark at the base on 

 the back, where it is deeply and coarsely furrowed ; in the fe- 

 male the superior edge is black towards the apex. Wings iri- 

 descent with a yellow tinge. Stigma and nervures brown. Legs 

 ferruginous ochre. Tarsi and tips of hinder tibiae fuscous 3 in 

 the female the hinder thighs excepting the base, the tibiae and 

 tarsi are blackish. 



Obs. The coloured Insect is a female, and fig. 6. the abdomen in 

 profile : fig. /. is the upper side of the male abdomen. 



In the Cabinets of Mr. Haliday and the Author. 



