Jus THE CANADIAN ENTOMOLOGIST. 1% 
and is still more remarkable on account of the long cubitus, that vein 
being very short in all the other species. In Europe this genus is 
represented from Sweden to Italy by a few species which are generally of 
rare occurrence and have been observed to be parasitic on wood-feeding 
insects. There are two species in S. Africa, P. maurus and P. discolor : 
the former is wholly black ; the latter is distinguished from all others by 
pectinated antennæ, by a bifurcate scutellum, and by a concave abdominal 
dorsum. P. Hedychroides is a small Ceylonese species, and P. Saleius 
from Australia, is the smallest species of the genus yet known. 
Philomides, Haliday, is another genus of Perilampide, and is only 
represented by P. paphius Hal, a native of Cyprus. The genus 
Psilogaster Brulle, is placed by that author next to Peri/ampus. 
Callimome consists of much smaller insects than those of the genera 
of Chalcidie, before mentioned, and some species are abundant in 
England. None have been reported in Canada, but the genus is doubt- 
less there, as it occurs both to the north and the south of that region. 
Two species have been found near Hudson’s Bay. One of them, C. 
cecidomye is most allied to the British C. euchlorus; it is parasitic on 
Cecidomyia spongivora, which forms galls on the willow. The other, C. 
splendidus, should be placed next C. purpurascius, with which it agrees in 
its stout structure. The species collected by E. Doubleday, in the United 
States, appear to be different from those described by Say, and a few 
more from the same region have been lately published by Osten Sacken. 
The British species are very numerous, and, as to the female, may be most 
obviously distinguished from each other by the comparative length of the 
oviduct. The chief district of the genus seems to be now N. Europe, the — 
known species of Australia and S. America being small and scarce. Some 
are natives of E. Siberia or Amurland, and it is probable that the more 
Southern parts of Asia were the earlier habitation of the present European 
species. Their instinct induces them to act so that their young ones may 
live at the expense of gall-making insects, and there is much to observe in 
the mutual adaptation of the size of the gall and the length of the 
oviduct, and as to what species are exclusively reared in one kind of gall 
or are developed in several kinds, and whether differences of habitation 
have any effect on outward appearance. The many-chambered galls are 
more interesting than those with a single cell. Some ten or twelve species 
of Callimome resort to oak apples and effect lodgments for their eggs at 
depths proportioned to the length of their oviducts ; the species which 
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