THE ENTOMOLOGIST. 443 



observations on their habits here recorded were made by 

 M. le Col. Goiueau several years ago. It is probable that 



ENTEDON AMYCIAS. 



the species mentioned inhabit England, and may be found 

 by collecting the mined leaves which are often abundant: — 

 Omphale palustris, Gour., parasitic with Dacnusa flavipes, 

 Gour., and Blacus? Florus, Gour., on Agrorayza nana; 

 Entedon Lepidus, Gour., parasitic with Dacnusa punctum, 

 Gour., on Phylorayza Scolopendri, Desv. ; Entedon Gratus, 

 Gour., parasitic on Phytorayza Plantaginis, Desv. ; Entedon 

 Latreillei ? parasitic with Dacnusa maculata, Gour., on 

 Phytorayza Aquifolii, Gour. ; Entedon Cyrinus, Gour., 

 parasitic with Dacnusa incerta, Gour. (= flavipes }), on 

 Phytorayza flava, Meig. ; Omphale stigma, Gour., parasitic 

 with Cirrospilus cyanops, Gour., Systasis celer, Gour., and 

 Dacnusa Lysias, Gour., on Phytorayza horticolor, Gour. ; 

 Entedon Coponices, Gour., with Dacnusa Chereas, Gour., 

 and Opius Ambirius, Gour., on Phytorayza minuscula, Gour. ; 

 Entedon gracilis, Gour.,vi\i\\ Dacnusa flavipes, on Phytorayza 

 lateralis, JSIacq. Observations are still required to ascertain 

 whether the Chalcids and the Braconids above raentioned 

 participate in the substance of the little Muscids, or whether 

 the Chalcids are dependent on the Braconids for their 

 maintenance, and help to adjust the increase of the latter. 

 Goureau mentions that there are at least two generations of 

 the Muscids : the spring generation, when the Braconids 



