The MALE differs in having “the sixth segment of the _abdomen_ emarginate, and with a strong tooth on each side; the terminal segment emarginate, thus producing two strong, lateral, obtuse teeth, the ventral plates of these same segments emarginate at the extremity, and the emargination fringed with hair; the claws bifid.” NATIVE SPECIES. 1. _papaveris_, Latreille. (Plate XIV. fig. 2 ♂♀.) GENERAL OBSERVATIONS. Named by St. Fargeau from _ανθος_, a _flower_, and _κοπὴ_, a _cutting_ or _incision_, from its habit of cutting sections out of the petals of the common scarlet poppy with which to line the cells it forms within the cylinder it excavates, just as _Megachile_ does with the leaves of various plants. It is noticed as British upon the faith of the specimens introduced by Leach into the cabinets of the British Museum and presumptively caught in the west or south-west of England, a region rich in rarities. Rennie in fact tells us that he has found it at Largs, in Scotland. One of Leach’s specimens I received in exchange from that establishment in 1842, and which is now in the possession of Mr. Desvignes, to whom my collections passed in the following year. This genus forms a sort of combination between the genera _Megachile_ and _Osmia_, it having the upholstering habits of the former in the mode with which it lines its nest, and the general habit of the latter. At a first glance, before its habits were known or its structure examined, even an experienced entomologist might have placed it under _Osmia_, as an unrecognised species, for it very strongly resembles the _Osmia leucomelana_. This proves how very inconclusive habit is as an index to habits, the latter of these insects drilling into the pith of brambles, and the _Anthocopa_ tunnelling cylinders into the hardest trodden roads or pathways and lining them with its crimson hangings.