ON THE HYMENOPTERA OF THE GEORGETOWN 
MUSEUM, BRITISH GUIANA.* 
By P. Cameron. 
Part I. 
The species of Hymenoptera in the British Guiana Museum having been sent 
to me for examination by Mr. J. Rodway, the Curator, I have thought it desirable 
to enumerate all the species, described and undescribed. In this paper I have 
dealt with the Cynipide, Ichneumonide and Evaniide. The number of new 
species is large. afact not to be wondered at; seeing how very little has been written 
upon the Parasitic Hymenoptera of North-east South America and, indeed, of 
South America as a whole. 
It gives me pleasure to state that the specimens are well-set, in good condition 
and free from traces of the ravages of mites or Psocz. 
CYNIPID. 
Charips (charips) guyanensis, sp.n. 
Black, smooth and shining, the antennz, legs and mandibles rufo-testaceous, 
the antenne paler, more yellowish in tint than the legs, darker towards the apex; 
the palpi pallid yellow; wings hyaline, the nervures pallid testaceous ; the 
apical abscissa of the radius roundly curved, as long as the part of the radius 
bounding the radial cellule ; the cubitus not traced beyond the cubital cellule. 
The third antennal joint is distinctly thinner than the fourth, and not quite 
one-fourth longer than it. The radial cellule is closed in f ont. 
On the same card as the female is a male which has the antenne almost black 
from the 4th or 5th joint ; the hind femora are darker coloured, being infuscated 
above and below. 
Charips is the name adopted by Dr. Kieffer (Das Thierrich, Cynipidee) for the 
genus formerly known as Allotria and Xystus, both these names being, it appears, 
pre-occupied. 
EVANIID, 
Evania rodwayi, spn. 
Black, densely covered with a white silky pile, more sparsely so on the mesono- 
tum ; wings hyaline, the nervures black, inclining to fuscous ; the recurrent 
\ 
* Although but few of these have been found as parasites their importance in dealing with 
insect pests is incalculable. They preserve the balance of life and prevent the serious injury 
which might arise were insect plagues allowed {ree scope. In the following list it may be noted 
that one is from a castor oil pest, another from a sweet potato moth and a third from a calabash 
moth. Some pests of weeds may perhaps suggest that weeds themselves are pests, but as the 
larvze are always liable to come upon our cultivated plants the parasites may be put down as 
exceedingly useful. The names given were not suggested by me.—J.R, 
