186 Mr. J. Hardy on the effects produced 



pleuris, ventre, lateribusque abdominis argenteis ; pedibus elongatis 

 cinereis, argenteo-micantibus ; alis subamplis, subdenigratis, dense 

 cinereo-fimbriatis, nervo costali crasso, obscuro, angulo nervi furcati 

 rectiore ; antennis nigris, 1 9 ?-articulatis, articulis confertis, dense 

 setigeris, duobus primis, ultimoque exceptis, subcylindricis ( ? ) ; 

 vel 20?-articulatis, duobus primis, ultimoque elongate oblongo-ovato 

 exceptis, pedicellato-oblongo-subquadratis, confertim pilis verticil- 

 latis obsitis (^) ; halteribus albis, capitulo dilatato. Corp. long, 

 lin. l^ ; alar. exp. lin. 3. 



4. C. Rosarum ; nigricans, minuta, nitida, vix subcinereo micans ; 

 thoracis margine posteriori, alarum radicibus, scutelli apice, meta- 

 thoraceque interdum carneis ; abdomine cameo, segmentis ad bases 

 nigricantibus ; ventre notis nigris asperso ; pedibus elongatis graci- 

 libus, albo-argenteis, subcinereisque variantibus ; alis mediocribus 

 abdomine brevioribus, denigratis, crebriter atro-cinereo pubescen- 

 tibus et fimbriatis, nervo costali, primoque longitudinali, subni- 

 gris, angulo nervi furcati subrecto ; antennis brevibus, gracilibus, 

 nigris, 14-articulatis, articulis subcrebre pilis longis verticillatis ob- 

 sitis, Imo cyathiformi, 2do rotundato, 3io ovato breviter pedi- 

 cellato, succedentibus oblongo-ovatis, confertis, ultimo tamen bre- 

 viter ovato ; halteribus albis, modice elongatis et clavatis. Long, 

 corp. lin. 1 ; alar. exp. hn. 2. $ . 



5. C. rhodophila ; pallida, minuta, gracilis ; capite atro ; thoracis 

 dorso fusco-cinereo, lineis tribus pilorum griseorum notato, margine 

 posteriori, scutello, metathoraceque flavidis, subcameisve ; abdo- 

 mine curtato pallide flavo ; pedibus elongatis, gracilibus, subflavis, 

 extrorsum cinerascentibus ; alis sublatis, hyalinis, purpureo-iridis- 

 centibus, subtiliter minus confertim pubescentibus et fimbriatis, 

 nervo costali, primoque longitudinali distinctis, subdenigratis, an- 

 gulo nervi furcati subacute ; antennis nigris, basi flavidis, graci- 

 libus, 18-articulatis, articulis, Imo et 2do brevioribus, crassiori- 

 busque, subcyatbiformibus, succedentibus cylindricis, gradatim lon- 

 gitudine et latitudine decrescentibus, ultimo ovato, breviter discre- 

 teque pilis verticillatis obsitis ; halteribus albis. Long. corp. lin. \ ; 

 alar. exp. lin. li. V • 



Obs. Mas adhuc exilior evasit. 



About the 2nd of July the leaves at the summits of the twigs 

 of Helianthemum vulgare, in this vicinity^ were collected into 

 bunches, but not so firmly compacted as those of the sallow. At 

 the bases of the leaves numbers of the larvse of a Cecidomyia 

 were congregated, to whose operation the deficient extension of 

 the shoots was owing. The grubs were narrow, slightly orange, 

 with the centre more dusky, somewhat truncate, and quadritu- 

 berculate behind; the attenuated anterior end with a pair of 

 bristle-like horns and a dusky spot ; a testaceous dagger-like line 

 on the breast, and a few hairs on the segments, with five or six 

 apical ones. Length 1 line. From these I reared a single spe- 

 cimen of the midge, which may be named 



i 



