110 [Oetuber, 



resembles, by a wliito curved spot immediately below the anterior stemmjv. This 

 insect so very closely resembles TacTiytes pompiliformis, that I always capture the 

 latter insect and satisfy myself that I am doing so ; by adopting this plan I detected 

 Astata at Barmouth ; the latter is at once known by its having three distinct ocelli, 

 and the mesothorax highly polished above ; these characteristics serve to distinguish 

 it on capture ; the neuration of the wing is better examined in the study. I think 

 it not unlikely that it may be mixed with specimens of Tachytes in some stores of 

 Symenoptera. 



A single specimen of the extremely rare Agenia bifasciata was found ; it is some 

 years since I last took it ; it is in few collections. 



Of ApidcB only one rare species occiirred, Andrena nigriceps ; two females, 

 and, for the first time, what I beUeve to be its male. 



DasypoAa Mrta I found on the sand-hills, but not very numerously. Of some 

 species only males were taken, therefore the locality would yield the other sex 

 during September. 



Nysson dimidiatus, always a rare species to me, occurred, but I scarcely think 

 the sand-hUls could be its proper habitat, having usually found it in cultivated 

 situations ; there arc four species of the genus found in Britain, only one of which 

 I have found plentifully, Nysson spinosus ; it frequents the wood-spurge, and biuTows 

 in the ground, but I have never- been fortunate in detecting it with its prey. 



Some of the commoner species of ants are more abundant at Barmouth than I 

 have elsewhere observed them ; on the mountain sides, as well as in the valleys, a 

 nest is found under almost every stone that is as large as a man's open hand. On 

 one favourable evening, tens of thousands, if not of millions, were on the wing ; 

 they dropped in innumerable numbers everywhere ; the shore was alive with their 

 hosts. The species appeared to be three in number, Formica nigra, Jlava, and 

 umbrata. Ilyrmicidcc were equally numerous under stones, &c., but I did not observe 

 any great flight of them ; they must at times be on the wing by myriads. 



The following is a list of the species observed ; those marked with the prefix * 

 were abundant. 



Fam. FoEMiciD^ : Formica *rufa, *cunicularia, *fusca, *nigra, *iimhrata, *flava. 

 Fam. Myemicid^ : Myrmica *scalirinodis, *ruginodis, Icsvinodis. Fam. Pompilidj5 : 

 Pompilus *plumheus, *gibhus; Priocnemis hyalinatus,exaUatus; Ceropales *niaai.lata. 

 Fam. SpHEGiD^ai: : AmmopJiila viatica. Fam. LAEEiDiE : Tachytes *pompiliformis, 

 Astata stigma. Fam. Ntssonid^ : Nysson dimidiatus, Harpactus tumidus; Mellinus 

 *arvensis. Fam. Ceabeonid^ : Crabro*Wesmaeli,hrevis,cribrarius; Oxyhelus *uni- 

 glumis, mucronatus ; Diodontiis tnstis, Cemonus lethi/er, Alimesa *unicolor. Fam. 

 PiiiLANTHiDiE: Ccrceris * arenaria. Fam. Eumenid^ : Odynerus parietum, antilope. 

 Fam. Vespid.1; : Vespa * vulgaris, germanica. Fam. Andbexid.e : Colletes succincta, 

 *Jodiens ; Prosopis hyalinata, Halictus ruhicundus, *leucozoniu^, albipes, villosultis ; 

 Andrena nigriceps, pubescens, albicncs ; Dasypoda hirtipes. Fam. Cuculinid^ : 

 Coelioxys simplex, Epeolus variegatus. Fam. DASTGASXEiDiE : Megachile maritima. 

 Fam. BoMBiCE: Bombus *muscorum, *sylvarum, *hortorum, Scrimshiranus, Hucorum, 

 Hapidarius. Fam. Cheysidid^ : Chrysis ignita, Hedychrum *ardens. — Feedk. 

 Smith, 27, Richmond Crescent, Islington : S^temher, 1875. 



