136 MODERN CLASSIFICATION OF INSECTS. 
considered that the antenne were necessarily employed as tactors, 
although they are so much shorter than the ovipositor. I have found 
this insect flying about walls in which Osmia bicornis breeds; but 
whether it is 7 the nest whilst in the progress of construction, or 
upon or in the body of the larva when hatched, that the egg is de- 
posited, has not been decidedly observed. Latreille states that in the 
night, or during bad weather, they fix themselves by their jaws to 
the stalk of different plants, and are then almost in a perpendicular 
position. 
The genus Paxylloma Brebisson (Plancus Curtis, Hybrizon Fallen, 
Jig. 74. 17. P. buccata, natural size, and 18 ditto magnified), placed 
by Latreille and Haliday (nt. Mag. vol.i. p. 343. and vol. ili. p. 22.) 
in this family, as well as Stephanus, appear rather to belong to the 
Ichneumones adsciti, or at least to constitute the links between them 
and the present family. ‘The latter genus is placed by Latreille 
amongst the Ichneumones genuini; but the veins of the wings are 
arranged as in some of the Adsciti, especially Chanon. Curt. 
I have illustrated the details of the various genera of which this 
anomalous family is composed, in a memoir presented to the Ento- 
mological Society, with descriptions of many species, not yet published. 

The family IcoNEUMoNIDm* Leach, corresponding with the greater 
part of the Linnzan genus Ichneumon, may, perhaps, be regarded as 

* Bistiocr. Rerer. To tHE [CHNEUMONID&. 
(Ichneumones genuini.) 
Gravenhorst. Nosographia Inchneumonum, 8vo. 1814. — Ditto, Monogr. Ichneum. 
pedestr. 8vo. Leipz. 1815.— Ditto (with C. G. Nees ab Esenbeck), Con- 
spectus Gen. et Famil. Ichneum. in Noy. Act. Natur. Curios. t. ix. 1818, — 
Ditto, Monogr. Ichneum. Pedemont in Mem. Acad. Turin, 1820, t. xxiv. 
Ditto, Additamenta ad Descript. Fabric. Ichn. Mus. Hubneri, in Germar’s 
Mag. der Ent. vol. iv. 1821. — Helwigia N. G. Ichneum. in Nov. Act. 
Acad. Nat. Curios. t. ii. 1823. — Ichneumonologia Europza, 3 vols. 8vyo. 
Vratislay, 1829. — Ditto, Ichn. Genuin. Sp. Cornute et Calcarate in Beytr. 
zur Ent. Schles. 1829, — Ditto, Moneta quedam, de Sp. Nigris Ichn. 4to. 
Breslaw, 1829. 
Thunberg. Ichneumonidea, Pars i. et ii. Mem. Acad. St. Petersburg, t, viii, and 
ix. 1824. 
