353. 

 XYLONOMUS PILICORNIS. 



Order Hymenoptera. Fam. Ichneumonidae Lat. 



Type of the Genus, Ichneumon irrigator Fah. 

 Xylonomus Grav., Curt. — Bassus and Ichneumon Fab. 



Antennce nearly as long as the body in the males, filiform, rugose 

 and very pubescent beneath, composed of about 26 joints j basal 

 joint robust, 2nd minute, 3rd long, 4th longer, the remainder 

 gradually decreasing- in length to the end, the apical joint elon- 

 gate-conic (l(?): shorter in the female, pubescent, slightly 

 thickened and curved at the apex j composed of many joints, 

 basal one subglobose, 2nd minute, 3rd and 5 succeeding long, 

 5 following shorter, the remainder more or less cup-shaped, 

 several producing slender spines nearly at right angles, terminal 

 joint long and conical (1 9)- 



Labrum transverse-oval, the basal angles produced ; a fleshy lobe 

 projecting from beneath, semicircular and densely pilose (2). 

 Mandibles short, subtrigonate, very broad at the base, internally 

 concave with a fascicle of hair on each side towards the apex (3). 

 MaxUl(X short and broad, internal lobe oval and clothed with short 

 pubescence, external a little larger, broader and very pilose. 

 Palpi very long and pubescent, pilose on the inside, 5-jointed, 

 1st and 2nd joints robust, subclavate, the latter a little the 

 largest, the remainder slender, the 3rd very long, 4th not longer 

 than the 1st, 5th as long as the 3rd (4). 



Mentum subobovate, truncated before, a little dilated where the 



Palpi are attached, these are stout, very hairy and 4-jointed, 



basal joint subclavate, 2nd and 3rd subtrigonate, the latter the 



smallest, 4th as large as the basal joint, ovate-conic. Lip forming 



2 spreading lobes (5). 



Head subglobose. Eyes not very prominent. Ocelli 3 in triangle. 



Thorax elongate-oval : postscutellum bidentate. Wings having no 



areolet (9). Abdomen sessile, slightly depressed, generally rugose 



at the base, with two elevated longitudinal lines on the 2 basal joints; 



slender and somevihat elliptical-conic in the male (7), basal joint tu- 



berculated. on the sides, 3rd and 4th at the base, the former being the 



largest: broader and subfusiform in the female : ovipositor nearly or 



quite as long as the abdomen. Legs, anterior small, posterior long 



and rather stout: tibiae suddenly narrowed at the base in the females, 



with a transverse groove: tarsi 5-jointed, basal joint the longest. 



Obs. The dissections are taken from X. pilicornis and the trophifrom 



a female. 



PiLicoRNis Grav. Ichn. Eur. v. 3. p. 833. n. 9. — Curtis's Guide, 

 Gen. 54\.n.9. 



In the Cabinets of Mr. Davis and the Author. 



