SoiME wasps, like the bees, live in society, constructing nests 

 composed of cells, but formed of very different materials. The 

 Odyncri on the contrary do not unite to form a nest to live 

 in, whence they are called Solitary Wasps : their economy, 

 however, is exceedingly curious, and they exhibit a degree of 

 instinct w^hich can scarcely be surpassed. Their eggs are de- 

 iiosited in cells made in old walls or sandy banks, about which 

 the species may be found in June, as well as upon flowers. 



My friend Mr. Charles Fox detected upon the top of a book, 

 across which another was laid, some cells of a somewhat trian- 

 o-iilar form, covered externally with mud and formed of a silky 

 substance within : he very obligingly transmitted the book to 

 me last winter, and in the spring nearly 20 specimens of the in- 

 sect figured made their appearance; they were all females, and 

 did not vary in the least. I have no doubt of their being the 

 Fespa j)arietinus of Linnasus's Faun. Suec. of which there is no 

 figure that I am acquainted with. Panzer's V. parietina being 

 the V. muraria Linn. It is very easily distinguished from our 

 other species by the unclouded wings and the entire orange 

 underside of the antennae. 



The following species are in the Author's cabinet. 



1 O. spinipes Z,., Panz. 17. 18. 



2 pictus Nob. 



3 murarius L. — parietina Panz. 49. 24?. 



4 Scoticus Nob. 



5 Antilope Panz. 53. 9. 



6 parietus L., Schcejf. Icon. 24. 3 ? 



7 similis Nob. — quadratus Don. Brit. Ins. 14. 495. 2. 



8 nigi'icornis Nob. 



9 parietinus Linn. Faun. Suec. 1679. 



10 quadratus Panz. 63. 3. 



11 angulatus Don. 14. 495. 1. 1. 



12 flavipes Nob. 



13 6-fasciatus? Fab. 



14 4-fasciatus ? iv?6. 



15 emarginatus Fab. 



16 bidens Linn. S. N. 2. 951. 16. 



17 connexus Nob. 



0. pictus has a very shining abdomen. 



O. Scoticus has rufous tibiae and tarsi. 



O. similis may be only a variety of O. parietus. 



O. Jiigricornis has the apex of the abdomen and antennae, ex- 

 cept at the base, black. 



O.Jlavipcs may be only the male of No. 1 0. 



O. connexus is like No. 16, but has an entirely black thorax. 

 The campanulate and narrow basal joint of these 2 species 

 approaches the form of Eumenes. 



Borage officinalis (Common Borage) accompanies the insect. 



