ICHNEUMONIDES. INSECTS. 337 



tated on their internal side ; maxillary palpi very long, of six 

 unequal joints, the labial of four ; inferior lip in three divi- 

 sions, that in the middle strongly notched ; sheath broad and 

 dilated on the sides ; head flattened ; thorax large ; abdomen 

 small, triangular, or oval, inserted at the upper part of the 

 thorax. 



E. appendigasler, Lat. Body entirely black ; head and thorax un- 

 even ; abdomen smooth and shining ; wings white, veined with 

 black, and a black point in the middle of the exterior border of 

 the upper ones ; antennae, tarsi, and four anterior legs fulvous. 

 4 lines long. Southern Europe. Lat. Hist. xiii. pi. 101, fig. 1. 



TRIBE II. ICHNEUMONIDES. 



Abdomen arising between the two posterior feet ; the four wings 

 veined, the upper always with inclosed or complete discoidal 

 cells ; maxillary palpi at least always very apparent or project- 

 ing ; perforator with three filaments ; antennae setaceous or 

 filiform, rarely clavate, and composed of a great many joints. 



This tribe is chiefly composed of the genus Ichneumon of Linnasus, thus named 

 because these insects destroy the larvae of the Lepidopterous insects, so hurtful to 

 agriculture, in a way analogous to the Ichneumon of Egypt, which destroys the eggs 

 of the crocodile. Their body is long and linear, with the perforator sometimes exte- 

 rior like a tail, sometimes very short, and concealed in the interior of the abdomen. 

 The larvae have no feet, and resemble small worms. When the female is ready to 

 deposit her ova in the bodies of the larvae, in the pupae, or eggs of other insects 

 and spiders, destined to aftord food to her young, she runs about the places where 

 nature has taught her these larvae maybe concealed, and with admirable instinct in- 

 serts the ova in the body, which is afterwards to become the prey of the young Ich- 

 neumons, and where they live in the manner of intestinal worms. 



I. Maxillary palpi with five joints. 

 I. Labial palpi with four joints. 



A. Mouth not advanced like a rostrum. 



a. Joints of the maxillary palpi very unequal. 

 * Antennae filiform or setaceous. 



-j- Mandibles entire or slightly bidentated at their extremity. 



Gen. STEFHANUS, XORIDES. 



f-f- Extremity of the mandibles very distinctly bidentated. 

 Borer projecting. 



Gen. PIMPLA, CRYPTUS, OPHIOJT. 

 Borer concealed, or slightly projecting. 



Gen. METOPIUS, BASSUS, ALOMYA, LCHNEUMON, TROGUS, JOPPA, BAN- 

 CHUS. 



** Antennae terminated in a club. 

 Gen. HELLWIGIA. 



b. Joints of the maxillary palpi of forms slightly different, or changing gradually. 



Gen. AC^ENITUS. 



B. Mouth advanced in the form of a rostrum. 



Gen. AGATHIS. 

 2. Labial palpi with three joints. 



Gen. VJPION, BRACON, MICROGASTER. 

 VOL. II. Y 



