24 ROEBUCK : ON YORKSHIRE HYMENOPTERA. 



numbering 95, v.hlch thus compares favourably with the 71 of Mr. 

 Bold's published list for Northumberland and Durham. 



I am also under great obligations to Mr. E. A. Fitch, of 

 Maldon, Essex, for suggestions and information, as well as to 

 others whose aid I have duly recorded in connection with the 

 various groups, such as Mr. Peter Cameron, junr., of Glasgow, 

 the Rev. T. A. Marshall, M.A., F.L.S., now of Antigua, Mr. S. 

 D. Bairstow of Huddersfield, &c. 



Mr. Robert Cook of York, who possesses a number of 

 Hymenoptera in his collection, mostly taken about York some 30 

 or 40 years ago, had some of them named by a Dr. Stephenson 

 of Kentish Town. The names of TricJiiosonia lucormn., T. lateralis, 

 T. sylvaficiis, CJirysis ignita, Pompilus fuscus, P. viaticus, Ainmo- 

 phila sahulosa, Odynerus qiiadratusi, Vespa vulgaris, Colletes 

 siiccincta, Sphecodes gibbus, Halidus rubicundus, Andrena tiitida, 

 A. albicans, A. nigro-a:iiea, A. fulvicrus, A. labialis, A. convexius- 

 cula, A. xanthura, Nomada rufivenirisi, Meleda pundata, 

 Anthidiiim manicattwi, Chelostoma maxillosu^, Anthophora retiisa, 

 Botnbus muscorum, B. lapidarius, and B. terrestris, which there 

 occur are not incorporated in my lists on account of the doubts 

 as to whether some of them were not collected outside the 

 county, and also in one or two cases on account of questions of 

 nomenclature. 



Very few of my own records are given in the lists included 

 in this paper, as, in order to ensure, so far as I am concerned, a 

 high degree of accuracy, I have reserved my own observations or 

 determinations of species for verification and more detailed and 

 careful study. It is necessary that a solitary worker (for with 

 the exception of my friend Mr. S. D. Bairstow of Huddersfield, 

 who is engaged in the study of Idineinnojiidce, I am not aware of 

 the existence of any hymenopterist within our Union, nor, I 

 believe I am justified in adding, within the northern and north 

 midland counties; nor am I aware of the existence of any 

 collection within many miles which might afford assistance) should 

 be extremely careful and cautious in publishing his observations, 

 in the absence of safeguard against error. 



Trans.Y.N.U., 1877. Series 1) 



