by some Insects upon Plants. 185 



on the fore-part of the breast ; and the hinder end is subtruncate, 

 slightly tuberculate. The most numerous is orange mottled with 

 yellow ; and the other is white, smoother, more minute, with the 

 hinder apex trituberculate : both are sparingly bristled across 

 the segments. The first is scarcely distinct from another yel- 

 lowish grub often found on the underside of the leaves of garden 

 roses affected with mildew, which appears to be engaged in de- 

 vouring the minute fungi in which the disease consists. They 

 descend into the soil to undergo their changes, and I doubt if I 

 shall succeed in rearing them. About the time of their first ap- 

 pearance, however, I met with two species of Cecidomyia fre- 

 quenting the infested rose-bushes, of which one, C. Rosarum, 

 was occupied in depositing its eggs in the unopened leaflets. 

 They are both undescribed species, and till the contrary is 

 proved, I shall assume that they are the parents of the grubs in 

 question. 



To render these remarks more satisfactory, I shall append de- 

 scriptions of the species to which they refer ; which, except in the 

 instance previously specified, are taken from fresh specimens. 



1 . C. saligna ; nigro-cinerea ; facie, verticeque sericeo-albis ; occipite, 

 oculisque nigris ; scutello, lateribus, margineque posteriori thoracis 

 subcarneis ; pleuris et macula ante bases alarum argenteis ; abdo- 

 mine carneo, segmentis superne transversim nigricante fasciatis ( ? ) ; 

 vel nigricante, marginibus posticis segmentprum vix carneis {S) '"> 

 pedibus subelongatis, argenteo-cinereo-testaceis, tarsis fuscis ; alis 

 modice amphs, denigratis, dense griseo pubescentibus et fimbriatis, 

 nervo costali nigro, angulo nervi furcati subrecto ; antennis bre- 

 vibus, cinereis, basi subtestaceis, 1 6-articulatis, articulis duobus 

 primis cyathiformibus, ultimoque ovato exceptis, suboblongis, con- 

 fer tis, pihs verticillatis obsitis ( ? ) ; vel nigris, 1 7-articulatis, arti- 

 culis, Imo cyathiformi, 2ndo subrotundato, ultimoque subgloboso 

 exceptis, pedicellato-oblongis, pilis longis fere biverticillatis obsitis 

 (cJ) ; halteribus albis, modice elongatis et clavatis. Long. corp. 

 hn |-1 ; alar. exp. lin. 2. 



2. C. Cinerearum ; nigro-cinerea ; facie grisea ; oculis nigris ; thoracis 

 lateribus, nonnisi pleuris, maculaque ante bases alarum argenteis, 

 concoloribus ; dorso subelevato ; abdominis dorso nitido piceo, late- 

 ribus obscurioribus ; pedibus prselongis, pallide testaceis vel carneis, 

 argenteo-micantibus ; alis amplis, subhyalinis, sparse cinereo-pubes- 

 centibus et fimbriatis, nervis brunneis, subtenuibus, angulo nervi 

 furcati subrecto ; antennis nigris, 22-articulatis, articulis duobus 

 primis crassioribus, subtransversis, reliquis, ultimo elongato-ovato 

 excepto, pedicellato-subglobatis, introrsum longe, extrorsum bre- 

 viter discreteque pilis verticillatis obsitis ; halteribus elongatis albis, 

 capitulo subdilatato vix fuscescente. Long. corp. lin. 1^ ; alar. exp. 

 hn. 4. ^. 



3. C. Gallarum-Salicis ; nigro-cinerea ; scutello piceo, concoloreve ; 

 Ann. ^ Mag. N. Hist, Ser. 2. Vol. vi. 13 



