390 Mr. J. Hardy on the Primrose-leaf Miner, 



impossible to separate from the present, but which, in its pupa 

 state, is very distinct ; and the mode of mining adopted by the 

 larva supplies another diversity. It is probably the Ph, obscu- 

 rella of Fallen (Phytomyz. iv. 8), which is characterized in nearly 

 the same terms : " nigricans ; proboscide halteribusque albis ; 

 tibiis genubusve subpallidis." Mr. Haliday bred Ph. obscurella 

 from the holly (Ent. Mag. iv. 147), and I obtained my specimens 

 from pupse inclosed in the leaf of a honeysuckle, growing in the 

 shade of that tree. In addition, I may remark, that a species 

 supposed to be Ph. nigra was procured by Mr. Curtis (Brit. Ent. 

 fol. 393) from pupse found by a lady under the leaves of the 

 Columbia e ; and that Rennie observes that the leaves of the poly- 

 anthus are occasionally affected in a manner similar to those of 

 the primrose. 



From the examination of several species of these miners in 

 their various states, I have been led to perceive that there are at 

 least two generic forms included under the term Phytomyza, and 

 which, although I do not find any tangible distinctive character 

 in the perfect insects, I propose to separate on account of differ- 

 ences in the pupa state, accompanied by a corresponding varia- 

 tion in habit. To those with slipper- shaped pupse, whose trans- 

 formations take place entirely within the leaf, I propose to apply 

 the name Chromatomyia {^(pcofjLa, color ; /juvta, musca) ; while the 

 name Phytomyza may be retained for the species whose pupse are 

 barrel-shaped, and whose larvse enter the ground to pass the pe- 

 riod antecedent to their final change. The larva of one species. 

 Ph. lateralis, is said to live and undergo its mutations in the 

 interior of the heads of Pyrethrum inodorum (Curt. Brit. Ent. 

 fol. 393) ; but whether this departure from the general habit is 

 attended with a change of structure we are not informed. The 

 species, whose complete history has been ascertained, stand as 

 follows : — 



Chromatomyia, Hardy MSS. 



1 . Ch. flaviceps. Phytomyza flaviceps, Macq. Dipt. (S, a Buffon) 

 ii. 616. Larva subcutaneous in the leaves of the honeysuckle. 



2. Ch. nigra. Phytomyza nigra, Meig. vi. 191. Larva found in 

 the leaves of the primrose. 



3. Ch. obscurella. Ph. obscurella. Fall., Meig. vi. 191. Larva 

 lives in shapeless blotches in the leaves of the honeysuckle. 



4. C/i. cmereo/ro/i5. Hardy MSS. Nigro-cinerea ; hypostomate 

 albo-infuscato ; proboscide albida ; fronte cinerea ; marginibus 

 oculorum punctis nigris notatis; palpis, antennis, punctoque 

 verticis nigris ; thorace sciitelloque cinereis, opacis ; abdomine 

 griseo-nigricante, nitido ; margine postico segmenti penultimi 



