THE PHYSIOLOGICAL CRITERION OF SPECIES. 319 



niger, he found, however, that L, fJaviis much more readily suck the 

 gland of these caterpillars than L. niyer. 



It is very satisfactory to have had these observations made in 

 England, and we congratulate Mr. Eayward. Father Wasmann records, 

 among what he calls the "honey caterpillars," Lycaena an/us, larwse 

 with ants, pupae in the nests of Lasius niger. Lycaena dorylas, larvce 

 almost always in company with ants on Anthyllis vulneraria. He also 

 writes that the dorsal opening of the 11th segment is present in the 

 larvae of the European Lycaena boetica, icarus, aryiolus, aeyon, and 

 medon, which, on being sought by the ants, is caused to shut/'' 



PROCTOTRUPiDiE. — Exallouyx ivasmanni, Kief. — I have taken this 

 species (^s and ? s) with Lasius fidiyinosiis at Wellington College. 

 It is new to Britain. 



Tropidopria fuliyinosa, Wasm. — I have taken this species ( ^ s and 

 $ s) with Formica rufa at Corbridge, in Northumberland, and have 

 bred it out of my observation nest of the same ant from Weybridge. 

 I have also taken it with Lasius fuliyinosus at Wellington College. 

 This is its first record for Britain. 



Meyaspilus sp. ? — I have captured ^ s and $ s of a small species 

 of this genus with F. rufa at Weybridge and Corbridge. 



Synopeas sp. ? — I took a specimen in a nest of F. fiisca at Bar- 

 mouth last June. 



Ceraphron sp. ? — I took a very small species of this genus with 

 F. rufa at Corbridge, in April. 



Anteon brevifilis, Kief. — I took a specimen in a nest of Formica fusca 

 at Niton, Isle of Wight, in July. 



I must thank Dr. Kieffer for having very kindly named all the 

 above species for me. 



Pseudisobrachium cantianum, Chitty. — Mr. Chitty has described this 

 new species from a specimen he took at Charing in a nest of Ponera 

 contracta. The insect bears a strong resemblance to the ant with 

 which it was found. 



Pseudisobrachium subcyaneum, Hal. — Only the 5^ is known of this 

 species. Mr. Chitty, who has taken it not uncommonly in the 

 Faversham district, suggests it is parasitic on Myrmecina latreillei. 



Ichneumon iD^. — Hemiteles subzonatus, Gr. — I took a ? specimen 

 in a nest of Forinica rujibarbis var. fusco-rufibarhis at Whitsand Bay, in 

 September. Mr. Morley kindly named it for me. Nothing is known 

 of the life-history, it is very possibly parasitic on the ant. 



[To be continued.) 



Some remarks on the physiological criterion of species. 



By W. E. SHARP, F.E.S. 

 In a recent issue of this magazine {Ent. Record, xviii., p. 217) there 

 appeared a very interesting note on the British species of the coleop- 

 terous genus Dinarda, Grav., by Mr. Donisthorpe, but, although the 

 article introduces a new species to our list, no morphological specific 

 distinctions are tabulated, and the stress laid on physiological data 

 (that of difference of association) leaves one under the impression that 



* For further details of this subject see Nat, Hist, of British Butterflies, 

 pp. 30-37, also £nt. Eec, xviii., p. 299. — Ed. 



