236 Scientific Proceedings, Royal Dublin Society. 



" Head and thorax as in No. 1 : abdomen as in 8ph. denticulata : 

 hind legs longer and more slender than in this last, and the 1st joint 

 of tlie feet less dilated : fore feet rather thick, with the end of the first 

 joint and the entire second white : the hind legs are scarcely thicker in 

 the male than the female. (Length 1^ ; wings 3 lines.) 



" Found in the New Forest by F. Walker, Esq. ; also near London." 



This species is not to be found iu the Collection ; apparently Haliday 



described it from specimens in Walker's Collection. It, however, is a most 



distinct species which I have found in various localities near Newmarket, 



England. 



3. Spficerocefa vaporarionim Hal. — Originally described under Section 

 " AA. Thorax et scutelhim granulati, Imjiis margo denticulatus," as follows : — 



" Sp. 3. Sph. vaporariorum. Capite thoraceque nigris ; femoribus 

 posticis parmn tncrassatis fern., clavatis mas. 

 " Lordatia coprina, Rob. D. 809. No. 4. 



" Resembles the following species, but the hind thighs of the male 

 are nearly as large as in No. 1, and a little thickened iu the female also : 

 the 1st joint of the hind feet is less dilated tlian in No. 4, the wings 

 shorter : abdomen attenuate behind : thorax generally withoxit impi'essed 

 lines, but is more irregularly and thinly sliagreened about the middle 

 than elsewhere. (Length 1 ; wings 2 lines.) 



" I find it commonly on deliquescent cucumbers. Mr. P. Walker 

 also takes it near Loudon." 

 Five specimens, four bearing a label " Cucumbers." The species is very 

 closely allied to pusilla Fin., the abdomen is not always attenuate behind, 

 the groundwork of thorax is not very shining, and there are faint indications 

 of two smooth lines on thorax ; its shorter wings and stouter femora dis- 

 tinguish it. Tlie fact that Haliday did not use Desvoidy's name of coprina 

 for this species seems to prove that he was doubtful of .^the synonymy, 

 moreover the species does not agree with Desvoidy's generic description of 

 " tarsi postici duobus primis articulis dilatatis"; it therefore appears inadvisable 

 to revive the name coprina. 



4. Sphceroceva denticulata Meig. — Several specimens of what I consider 

 to be 8. pusillaYXn., whicli may have represented Haliday's idea of denticulata ; 

 he found them " in the same localities with tlie first species, but much less 

 abundant," and this applies well to pusilla. It is quite possible that Meigen's 

 denticulata was only pusilla, for he originally recoguized only substiltans and a 

 small species (his denticulata). 



