HYMENOPTERA. — ICHNEUMONID&:. 151 
organs attached thereto, of the female sex (Ichn. extensorius), while 
the abdomen and its appendages are masculine (I. luctatorius), in the 
Bull. Acad. Sci. Bruxelles, vol. iii. 1836. Réaumur (Mémoires, tom. vi. 
mém. 9., tom ii. mém. 11., &c.), De Geer (Mémoires, tom. i. passim, 
and tom. ii. pl. 29, 30.), Kirby and Spence (Jnérod. vol. iv. chap. 44), 
Bouché (Naturgeschichte des Insect.), Lozier (in Trans. Amer, Phil. 
Soc. vol. v. 1802), Rosel (Ins. Bel. vol. ii. Bomb. Vesp. tab. 4—6.), 
Disderi (in Transact. Turin Acad. vol.ii.), Goeze (in Der Naturforscher, 
vol. v.), Frisch and Gédart (in various of their plates), and Drewsen 
and Boie (in Wiegmann’s Archiv. fiir Naturg. vol. ii. No. 1. translated 
in The Naturalist, 1837), have given many details relative to the 
natural history of different species of this family. 
In the last Linnean edition of the Systema Nature seventy-seven 
species were described as appertaining to the genus Ichneumon, divided 
into seven sections, of which all except the last were founded upon the 
colour of the scutellum and antenne, the last being thus described, ‘ Mi- 
nuti, antennis filiformibus, abdomine ovato sessile ” (vol. il.p.938.). The 
species introduced into this section (except I. Aphidum, globatus, and 
glomeratus) belong to the families Chalcididee and Proctotrupide. Fa- 
bricius, Jurine, and Latreille (in his earlier works) proposed the sepa- 
ration of various genera from the mass of true Linnean Ichneumons, 
which by degrees became restricted to the group as above characterised; 
the families Evaniide, Chalcidide, and Proctotrupidea having been 
established upon species most of which had at first been regarded 
as Ichneumons. In the joint memoir of Gravenhorst and Nees ab 
Esenbeck, published in 1818, the Ichneumonideous genera were first 
divided into two stirpes — the Ichneumones genuini and the Ichneu- 
mones Adsciti; these two stirpes being further divided into numerous 
genera; the Adsciti being primarily divided into two groups named 
Bracones and Bassi (the latter name being very inappropriate, the 
genus Bassus belonging not to this group but to the genuine Ichneu- 
mons, and which Stephens accordingly changed to Alysiide).* Fallen 
subsequently (1823) divided the family into two groups, corresponding 
with the Genuini and Adsciti of Gravenhorst and Esenbeck, but charac- 
terised, — 1. “alis area speculari instructis,” and 2. “ alis area speculari 
destitutis.” Latreille, in his later works, and Stephens ( Catal.) formed 
the Ichneumons into three primary divisions, answering to the Genuini, 
* Nees ab Esenbeck, in his Monographie (1834), retained these two groups» 
terming them Ichneumonides Braconoidei, and Alysioidei, 
L 4 
