2 1 74 Insects. 



third and fourth segments, is a fascia of white pubescence, usually in- 

 terrupted on the first, sometimes on the second also, or subinterrupted ; 

 the pubescence on the apical segment stained with fulvous. 



Male. — (Length 4 J — 5 \ lines). Black ; the antennae nigro-piceous 

 beneath ; the face has a thin pale yellow pubescence ; the clypeus has 

 sometimes an obscure white spot at its apex. Thorax clothed with a 

 thin pale rufous pubescence ; the tegulae nigro-piceous ; the wings 

 subhyaline, iridescent ; the posterior tibiae and tarsi, the intermediate 

 tarsi, and apical joints of the anterior pair, rufo-testaceous. Abdomen 

 subovate, widest towards the apex ; a white fascia on the basal mar- 

 gin of the second, third and fourth segments, the two first more or less 

 iuterrupted. 



Walckenaer considers this species synonymous with the Andrena 

 fodiens of Latreille, but such cannot be the case, since Latreille dis- 

 tinctly says the bands are on the anterior, or basal margins of the 

 segments ; the fodiens of Walckenaer, on the contrary, has the bands 

 on the posterior, or apical margins : I therefore reject the synonymy. 

 The male of this species is described by Mr. Curtis, in his beautiful 

 work on British Genera, under the title of Lasioglossum tricingulum : 

 it is raised to the rank of a genus on a difference in the form of the 

 lobes of the maxillae, but in fact several of the species of Halicti differ 

 in that respect more or less from each other. Mr. Curtis has also 

 given an admirable figure of the male. This species is very local, but 

 abundant in several situations, particularly in the neighbourhood of 

 Brighton. Mr. S. Stevens took it at Little Hampton, Sussex : it also 

 occurs at Hastings. Mr. Kirby captured it at Barham, Suffolk. 



Sp. 26. Halictus sexnotatus, Walckenaer, St. Fargeau. 

 Melitta sexnotata, Kirby. 



Female. — (Length 5 lines). Jet-black ; a few scattered white hairs 

 on the face. Thorax very closely and finely punctured, the pubescence 

 white and very thinly scattered ; the metathorax rotundate posteriorly; 

 the wings subhyaline, clouded at their apical margins ; the nervures 

 nigro-piceous ; the pubescence on the legs white, intermixed with 

 fuscous on the posterior tibiae above, on the tarsi beneath pale yellow. 

 Abdomen very bright and shining, closely and very delicately punc- 

 tured, a little thin white pubescence at the base, and a patch of the 

 same colour on the basal margin of the three intermediate segments, 

 the last frequently obliterated. 



