)3- )^ 3^ 



600. 

 OPHION VENTRICOSUS. 



Order Hymenoptera. Fam. Ichneumonidse. 



Type of the Genus, Ichneumon luteus Linn. 

 Opiiion Fab., Grav., Curt. — Anomalon Jur. — Ichneumon Linn. 



Antennce inserted above the middle of the face, remote, nearly as 

 long as the insect, very slender, the apex somewhat curved in 

 the female, composed of numerous joints, basal one a little the 

 stoutest. 



Labrum inserted under the clypeus, subtrigonate, arched at the 

 base, w^ith the angle produced, the apex acuminated, the sides 

 convex and hairy (2). 



Mandibles curved, convex, strongly bifid at the apex (3). 

 Maxillce short with an oval fleshy internal lobe and a larger 

 rounded and hairy external one. Palpi long pilose and 5-jointed, 

 2 basal joints elongated, stout andclavate, the remainder slender, 

 3rd the longest, 4th and 5 th a little shorter, the latter conical 

 at the apex (4). 



Mentum obovate-truncate, the angles emarginate to receive the 

 Palpi which are much shorter than the maxillary, pilose and 4- 

 jointed, first 3 joints somewhat pear-shaped and nearly equal in 

 length, 4th longer slender, conical at the apex. Lip rather 

 large and de-^ply notched in the middle (5). 

 Head short and broad : face transverse-ovate. Eyes large, vertical 

 and reniform : ocelli large and verg prominent, forming a triangle 

 on the crown (1 * the face, the 2 dark spots showing the sockets of 

 the antennce and above them the ocelli). Thorax ovate gibbose : scu- 

 tellum semiorbicular and convex, the sides compressed. Abdomen 

 carinated, falcated, clavate and compressed at the apex, attached by 

 a long slender clavate petiole, the apex truncated obliquely, the last 

 joint Or little acuminated above and deeply notched on the side, with 

 2 slender styles under the apex, an incurved hook in the centre and 2 

 broad vertical lobes at the bottom, meeting at the apex (6 ^) : deeper 

 in the female (6 ? ), with 2 small styles as in the male and a cleft 

 one that is parallel and 2 lobes somewhat erected at the middle, with 

 a groove reaching from the apex into the 6th segment, inclosing the 

 aculeus or oviduct (o). Wings ample extending to the apex of the 

 abdomen ; superior with a long marginal cell, not reaching the apex, 

 the internal cubital cell very long, semilunate, the apex being elon- 

 gated, without an areolet, the inner nervure of the discoidal cell very 

 much curved, sometimes angulated, with a small branch. Legs long 

 and slender : tibise with long spurs at the apex, anterior with one 

 spine: tarsi long slender and b -jointed, basal joint very long, 4th 

 the shortest : claws and pulvilli distinct. 



Ventricosus Grav. — Curt. Guide, Gen. 532. 141. 



Ochreous with a reddish tinge, eyes, crown of head, and a line 

 a little way down the face black, a line on the fore part of the 

 thorax, the entire underside, metathorax and 6 spots inside the 

 hinder coxae black ; apex of abdomen silky piceous ; wings yel- 

 lowish, stigma ochreous, nervures brown ; antennae orange, espe- 

 cially in the male. 



In the Author's and other Cabinets. 



