40 Records of the Indian Museum. [Vor ae: 
Family ARGIDAE. 
Genus Cibdela, Konow. 
Cibdela janthina (Klug) 
One male from Sadiya, Assam. 
Genus Athermantus, Kirby. 
In 1882 (List Hym. Brit. Mus., vol. 1, p. 54) Kirby characterized 
his genus Athermantus for Hylotoma imperialis,Smith. Kirby’s — 
description is brief and the figure is in part incorrect, so this genus 
has not been well understood. Konow in his table in the Genera 
Insectorum (fasc. 29, 1905, p.13) separates Kirby’s genus from the 
other Argini without a superapical spur on the hind tibiae, by the 
compressed hind tibiae. In his table of the genera of Argidae in 
Zeit. Hym. Dipt., vol. 7, 1907, p. 185, Konow abandons the 
character of compressed hind tibiae and separates Athermantus 
from the other genera on venational characters. Due to the in- 
accuracy of the artist and the probability that Konow had never 
seen a specimen of Athermantus, this separation cannot be used. 
Mr. Meade-Waldo has kindly examined the type of Athermantus 
imperialis (Smith) and from his notes and the descriptions there 
can be no doubt that the specimen before me is correctly deter- 
mined. ‘The following descriptive notes are given to more properly 
establish the identity of this genus :— 
Closely allied to Cibdela, Konow, but may be separated from 
that genus by the following comparison :— 
ATHERMANTUS, Kirby. 
Facial quadrangle much broad- 
er than the length of the 
eye. 
Posterior orbits much broader 
than the cephalo-caudad 
diameter of the eye. 
Malar space longer than the 
length of pedicellum. 
Postocellar area well defined. 
Lateral ocelli behind the supra- 
orbital line. 
Propodeum without a median 
furrow. 
Posterior tibize compressed. 
CIBDELA, Konow. 
Facial quadrangle with its 
width subequal or but little 
greater than the length of 
the eye. 
Posterior orbits much narrower 
than the cephalo-caudad dia- 
meter of the eye. 
Malar space narrower than the 
length of pedicellum. 
Postocellar area obsolete. 
Lateral ocelli with their ante- 
rior margins on the supra- 
orbital line. 
Propodeum with a faint me- 
dian furrow. 
Posterior tibize not compressed. 
In Konow’s table in Zeit. Hym. Dipt., vol. 7, 1907, p. 185, 
this should fallnext to Cibdela, but would be separated by the above 
comparison. 
