1906.] X89 



12 (5) Acrostichal bristles very short. 



13 (16) Legs yellow, at the utmost femora black or brown at the base only. 



11 (15) Face shining metallic, dull at the suture only 7. diademaJj. 



15 (14) Face all whitish-grey S. Jlaripes Mcig. 



Ifi (13) Legs black with just knees yellowish. 



17 (18) Face all whitish grey 9. jacufus Me\g. 



18 (17) Face metallic, on at least lower part. 



19 (20) Last portion of postical (fifth) vein longer than diseal cross-vein*; 



hypopygiuni smallish ; smallest species of this group... 



10. truncorum Meig. 



20 (19) Last portion of postical (fifth) vein shorter or at least not longer than 



diseal cross-vein.* 



21 (22) First and second portions of diseal (fourth) vein about equal* ; smallish 



species 11. dend robrenus J^ow. 



22 (21) First portion of diseal (fourth) vein obviously longer than second* ; 



largish species with handsomely striped thorax... 



12. petrophilus Kow. 



About thirty species of this genus are recorded from Europe, 

 of which at least a dozen more ought to occur in Britain ; T believe 

 that I possess about three unrecorded species, but my specimens are 

 not in sufficient quantity or quality for accurate identification. 

 Whenever a species occurs it is sure to be in abundance, but as most 

 of the species resemble each other so much they are not readily 

 recognised at the time of capture. 



1. M. micaceus Lw. : my specimens were taken in Sussex, Surrey, 



Suffolk and Norfolk, and T expect it is fairly common. At 

 present it is the only species recorded from Britain which 

 has only two bristles on the scutellum, although five are 

 known in Europe. 



2. M. muralis Meig. : I have caught this species in Devonshire, 



Hampshire, Sussex, Suffolk, and Westmoreland, and con- 

 sequently imagine it may be found anywhere if properly 

 looked for. 



3. M. tristis Zett. : T feel no doubt but that I have correctly 



identified as this species specimens from Cornwall, Hamp- 

 shire, Sussex, and Hereford, besides several from Rannoch 

 and Nethy Bridge, but yet the species seems to be un- 

 common. 



4. M. apicalis Zett. : I do not think that the male of this species has 



yet been described, but I believe I have correctly identified 

 numerous specimens of both sexes from the New Forest, as 

 well as stray specimens from Cornwall, Westmoreland, 



* Not very satisfactory characters, thougb I believe the species are distinct. 



