with notice of a new Genus o/Diptera. 391 



arete subalbido ; vitta laterali parva albo-flavescente ; ventre, 

 plaga minime interrupta gradatim laxata nigra nitida, in- 

 structo ; pedibus nigris, genubus strictius albidis ; halteribus 

 albis ; alis hyalinis, ad bases exalbidis, nervo transverso sin- 

 gulo. Long. corp. lin. j. 



This is nearly allied to the next. The larva mines the leaves 

 of barley. Two examples of the fly have been obtained. 



5. Ch. Syngenesis, Hardy MSS. Nigro -cinerea ; hypostomate 

 proboscideque albis ; fronte albo-flavescente ; marginum ocu- 

 lorum punctorum serie, puncto verticis, antennis palpisque 

 nigris ; dorso thoracis, cumque scutello, cinereis, opacis, late- 

 ribus autem cinereo-nigricantibus; abdomine griseo-nigricante, 

 marginibus posticis segmentorum quatuor primorum, anguste, 

 quinti paulo amplius exalbidis ; vitta laterali late alba ; ventre 

 nitido, incisuris albis, medio, plaga longitudinali macularum 

 nigrarum, ornato, quarum prima quadrata, reliquse parallelo- 

 grammicse, margine postico quintee interdum circulatim sinu- 

 ato ; segmento ultimo toto nigro ; pedibus nigris, genubus 

 albidis; halteribus albis; alis hyalinis, ad bases exalbidis, 

 nervo transverso singulo. Long. corp. lin. j-1 . 



The larva subsists within the leaves of the groundsel (Senecio 

 vulgaris), of the ragwort (S. Jacobaa), of the field-thistle (Cnicus 

 arvensis), and of the sow-thistle (Sonchus oleraceus). The wind- 

 ing galleries which it traces in such an elegant manner round 

 the edges of the leaves of the smooth-leaved maritime variety of 

 the plant last-mentioned, appear to be represented in the ' Hi- 

 story of Insects/ i. 298. fig. 1 (Family Library, no. 7) ; but the 

 figure scarcely gives any idea of their exceeding neatness. I have 

 it likewise from leaves of Cineraria, sent from Linlithgowshire. 

 The size is constant, which will separate it from the next, said 

 to be 1 \ line long; and the colouring of the head, halteres, &c. 

 appears to be much fainter than in Ch. nigricornis. 



6. Ch. nigricornis. Ph. nigricornis, Macq. Dipt. (S. a B.) ii. 

 618. Larva lives in the interior of the leaves of cinerarias and 

 turnips. Curt. Gard. Chron. Feb. 22, 1845, p. 117. 



7. Ch. ? Ilicis. Ph. Ilicis, Curt. Gard. Chron. July 4, 1846, 

 p. 444. Larva found beneath the leaves of the holly. Curt. I. c. 



I have likewise obtained the pupse of a species from the leaves 

 of Holcus lanatus, but they proved abortive ; and I have others 

 from the leaves of the holly, from which the fly has not yet pro- 

 ceeded. 



Phytomyza, Fallen, Meig. 



1. Ph.flava, Fall., Meig. vi. 196. Larva a miner of the leaves 

 of the buttercup (Ranunculus repens), of the bachelor's buttons 



