170 THE ENTOMOLOGIST. 
A MONOGRAPH or tHe Genus ACRORICNUS, Ratzesura. 
Family Ichnzumonip# : Subfamily Cryprinz: Tribe Crypripes. 
By Craupe Mortuey, F.Z.S. 
Turis genus has been thrice described under distinct names : 
first as above by Ratzeburg (Ichn. d. Forst. iii. 1852, p. 92), 
secondly as Xenodocon by Forster (Verh. pr. Rheinl. 1855, 
p. 237), and Kriechbaumer (Ent. Nachr. 1878, p. 22; ef. also 
p. 251 et lib. cit. 1879, p. 8), and finally as Linoceras by Dr. 
Laschenberg (Zeits. Ges. Naturw. xxv. 1865, p. 105); though 
its distinction from the earlier Osprhynchotus—of which I treated 
in Entom. 1914, p. 23—was only so recently understood that 
Dalla Torre commingled the species of both in 1900. From the 
latter it is at once recognised by the possession of two instead 
of a single basal, metathoracic transcarine; and from both that 
genus and the closely allied Joppidiwm, Walsh, in its hyaline or 
subhyaline wings, which in both those genera are nearly or 
quite nigrescent or infumate throughout. Only six species are 
represented in the British Museum and my own collection; a 
profusely ornate form from Persia (var. pulcher) is described by 
N. Kokujew in his ‘‘ Hymenoptera asiatica nova”’ (‘ Revue Russe 
d’Entomologie,’ 1905, p. 208) of A. elegans, Mocs. (Magy. Akad. 
Termész. Ertek. xiii. 1888, p. 11, female), which I do not know. 
; The genus is of peculiar interest on account of its parasitism 
upon bees and wasps, members of its own Order. 
TABLE OF SPECIES. 
(10). 1. Upper and lower margins of the discoidal cell parallel. 
(7). 2. Posterior metanotal transcarina entire throughout. 
(6). 38. Mesonotum and most of the abdomen black. 
(5). 4. Face, abdomen and scutellum black; legs 
rufescent . . ; é . 1. macrobatus, Grav. 
(4). 5. Face, abdominal bands and scutellum pale ; 
legs flavescent ; : ‘ 2. seductor, Scop. 
(3). 6. Mesonotum and abdomen brick-red, with 
flavous markings , ' 3. syriacus, Mocs. 
(2). 7. Posterior metanotal transcarina centrally 
obsolete 
8. Metathorax long, subdeplanate; face flavous 
4, peronatus, Cam. 
9. Metathorax short, convex; face centrallly 
black . : : : ; . 8. ambulator, Smith. 
(1). 10. Upper and lower margin of discoidal cell dis- 
tinctly divergent apically. 
(12). 11. Nervellus centrally intercepted ; abdomen red- 
marked . ; 6. melanoleucus, Grav. 
(11). 12. Nervellus intercepted above centre; abdomen 
all black . f : ; . 7. gunceus, Cress. 
