EURYTOMIDiE. 7 



In the vein of the fore wing of the Chalcidise the humerus is basal 

 and subcostal, and is succeeded by the ulna, which is costal, aud emits 

 the cubitus towards the disk and is succeeded along the costa by 

 the radius. 



The ulna and the radius successively decrease in length according 

 to the following series : — 



Ulna. — I. angustipennis, Nepe, brevis, minor, pusilla, angustata, 

 verticillata, petiolata, cornuta, tenuicoruis, attenuata, longicornis, 

 dissimilis, breviventris, depressa, linearis, hyalipennis, brevipennis, 

 crassicornis, vacillans, brevicornis, fulvicollis, flavicollis, Laothoe. 



Radius. — I. Laothoe, vacillans, brevicoruis, fulvicollis, flavicollis, 

 breviventris, depressa, hyalipennis, verticillata, crassicornis, brevi- 

 cornis, cornuta, pusilla, tenuicoruis, dissimilis, linearis, attenuata, 

 angustipennis, Nepe, petiolata, brevis, minor, angustata, brevipennis. 



I am indebted to the kindness of Mr. Saunders, of Ontario, Canada, 

 for specimens of Isosoma Vitis, which is mentioned in the ' Zoologist ' 

 as being cradled in grape stones. All the species of Isosoma that 

 have been discovered in Europe and in Madeira are distinguished by 

 two humeral spots : these do not occur in the American species nor 

 in those of Australia. The male of T. Vitis seems to have all the 

 characters of Eurytoma, and thus removes the partition between the 

 two genera ; the female most resembles I. depressa in structure. 



Of the four Australian species which have been recorded as 

 belonging to this genus, I. Volux and I. Oritias also resemble 

 Eurytoma as regards the male ; the female of I. Olbus is very like 

 I. Vitis in structure, and the male of I. Ravola resembles in structure 

 the British species of Isosoma, but has stouter antennae. 



The species of Isosoma in Europe and in Madeira possess a fuller 

 development of the characters of the group than those of America and 

 of Australia, and are less nearly connected with Eurytoma. Such 

 also is the case with the following new genus of Eurytouiidag, for 

 specimens of which I am indebted to the late A. H. Haliday, who 

 found them in straw roofs near Lucca, Italy. Whether the eggs are 

 deposited in roofs or are carried there with the straw from the fields 

 has yet to be ascertained. 



Genus PHILACHYRA, Haliday, MS. 



Mas. — Corpus gracile, nitens, longiusculum. Caput et prothorax 

 subpunctata. Caput prothorace paullo latius. Antennae ll-articulatae, 

 subfiliformes, verticillato pilosse, basi geniculate ; articuli 3 us et 4us 

 minimi. Prothorax subquadratus. Metathorax postice attenuatus. 

 Petiolus brevissimus. Abdomen glabrum, planum, lineare, thorace 

 multo brevius. Pedes graciles, longiusculi. Alae lougae. Fcem. — 



