22 NOTES ON CHALCIDIiE. 



are all distinct, and each of them is alternate with a row of punctures. 

 The petiole is longer than the metathorax in E. Cretheis and 

 Teredon ; but in E. Hecale, Abatos, Iphis and Pythes the meta- 

 thorax is longer than the petiole. 



The six preceding species were found in Florida, and appear to 

 differ from the seven following species described by Dr. Walsh ; — 



1. E. bicolor. Beared from a fungoid swelling on the oak. 



2. E. prunicola. Reared from a gall on Quercus Prunus. Var. 

 globulicola. Reared from a gall on Q. globulus. 



3. E. auriceps. Reared from oak-galls and from rose-galls. Var. 

 seminatrix. Reared from oak-galls. 



4. E. punctiventris. Reared from oak-galls. 



5. E. abnormicornis. 



6. E. Diastrophi. Reared from the above-mentioned fungus and 

 from bramble-galls. E. Bolteri, Riley, reared from the gall of 

 Gelecbia gallsesolidaginis, is said, by Dr. Walsh, to be a variety of 

 E. Diastrophi, but it may be another specie- 



7. E. studiosa, Say. This species is not ex'blusive in its selection 

 of a habitation for its offspring, but proceeds m&scrkninately to a 

 Cynips gall, to a Tenthredo gall, to a Cecidomyia gall, to an Aphis 

 gall, to a Coccus gall, or to a fuugus with the likeness of a gall ; or it 

 may consist of families or castes, each of which keeps aloof from the 

 rest, and has been brought up from .time immemorial in one kind of 

 gall. 



Dr. Walsh was not able to identify E. orbiculata, Say. 



Five Ceylonese species of Eurytoma have been described ; — 1. E. 

 contraria, Wlk. (albitarsis, Motsch.). 2. E. indefensa, Wlk. 3. E. 

 maculipes, Motsch. 4. E. gracilis, Motsch. 5. E. angustula, 

 Motsch. 



E. Capensis inhabits South Africa. 



The British species of Decatoma may be placed in the three 

 following groups according to the variations of length in the ulna : — 



Group 1. — Ulna at least one-fifth of the length of the humerus. 

 Nicsea, aspilus. 



Group 2. — Ulna about one-sixth of the length of the humerus, 

 biguttata, obscura, immaculata, plana, flavicollis, variegata, miuuta, 

 unicolor. 



Group 3. — Ulna not more than one-tenth of the length of the 

 humerus, llavicornis, tenuicornis, mesomelas. 



D. flavovaria, Ratz., may be the same as D. concinna ; and 

 D. flavoscapularis, Ratz., may be identical with D. biguttata. 



