THE CANADIAN ENTOMOLOGIST. 17 



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 antennae, by a bifurcate scutellum, and by a concave abdominal 

 dorsum. P. Hedychroidcs is a small Ceylonese species, and P. Saleius 

 from Australia, is the smallest species of the genus yet known. 



PhilomideSy Haliday, is another genus of Perilampidce, and is only 

 represented by P. paphius Hal., a native of Cyprus. The genus 

 Psilogaster Brulle, is placed by that author next to Perilampus. 



Callimome consists of much smaller insects than those of the genera 

 of ChakidiiE, before mentioned, and seme 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. 

 cecido7nycB is most allied to the British C. euchlonis ; 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 j the species which 



