hy 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 Cecidomyice 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. saliffita ; nigro-cinerea ; facie, Acrticeque sericeo-albis ; occipite, 

 oculisque nigris ; scutello, lateribus, margineque posteriori thoracis 

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

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

 vel nigricante, marginibus posticis segmeutorum vix carneis ( J* ) ; 

 pedibus subelongatis, argenteo-ciuereo-testaceis, tarsis fuscis ; aUs 

 modice amplis, deuigratis, dense griseo pubescentibus et fimbriatis, 

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

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

 primis cyathiformibus, ultimoque ovate exceptis, suboblongis, cou- 

 fertis, pilis verticillatis obsitis ( ? ) ; vel nigris, 1 7-articulatis, arti- 

 culis, Imo cyathiformi, 2ado subrotundato, ultimoque subgloboso 

 exceptis, pedicellato-oblongis, pilis lougis fere biverticillatis obsitis 

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

 lin f-1 ; alar. exp. lin. 2. 



2. C. Cinei'earum ; nigro-cinerea ; facie grisea ; oculis nigris ; thoracis 

 lateribus, nounisi pleuris, maculaque ante bases alarum argenteis, 

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

 ribus obscurioribus ; pedibus praelongis, pallide testaceis vel carneis, 

 argeuteo-micantibus ; alis amplis, subhyalinis, sparse ciuereo-pubes- 

 centibus et fimbriatis, nervis brunueis, subtenuibus, angulo nervi 

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

 primis crassioribus, subtransversis, rcliquis, ultimo elongato-ovato 

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

 viter discreteque pilis verticillatis obsitis ; halteribus elongatis albis, 

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

 lin. 4. S. 



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

 Ann. £(• Mag. N. Hist. Ser. 2. Vol. vi. 13 



