580 PHYSIOLOGY. 



Aix,, in Provence, and, consequently, belong to a still more recent 

 formation. They are accompanied by impressions of different plants, 

 but never by fish, the impressions of which are also found in distinct 

 strata. The majority of the insects enclosed by this marl have pre- 

 served their horny integument, and mere impressions are more rarely 

 found; but their colour appears to be gone, as they are of a uniform 

 brown or black. They are chiefly such insects which live upon a dry 

 sandy or clay soil, and which partly still are found in the vicinity of 

 Aix, as Brachycerus undatus, Forficula parallela, and Pentatoma 

 grisea. The list given by the above author includes the following 

 forms. 



1. Coleoptera. A Harpalus of moderate size; a Dylicus also of 

 moderate size ; a small Stapliylinns ; a Melolontha, remarkable from 

 its deep furrows on the elytra ; a Buprestis of the form of Trachys 

 nana, Fab. ; several Melanosoma, among which one like Asida grisea, 

 also a Chrysomela like C. cerealis ; two species of Cassida, one like 

 C. viridis; many bark-beetles ; one Apate, allied to A. capucina; an 

 Hylurgus, a Scolytus, and a Trogosita like T, cerulea ; lastly, innu- 

 merable Curculios, two Brachyceri, one like Br. nudatus, Dej., the 

 other like Br. algirus, Fab.; several species of Cleonis, one like Cleonis 

 distincta, Larinus, Germar (Rhinobates, Meig.) ; several Meleus, the 

 still living form of one species ; then Hyperte, Naupacti, one like 

 N. lusitanicus, Dej., and one Cionis, like C. Scrophulariee. 



2. Hymenoptera. Three species of Tenthredos, one smaller than T. 

 viridis, the second larger, and a third of moderate size; an Ichneumon ; 

 an Agathis, Lat. ; two Pulistes, one species like P. Gallica, the second 

 like P. morio, Fab.; several Formica, some larger, some smaller like 

 F. subterranea. 



3. Lepidoptera. One butterfly of the genus Satyrus, from the 

 communication of another party; a Zygoma, a Bombyx, perhaps a 

 Cossus of moderate size. 



4. Diptera. An Empis like E. tesselaia, a Nemestrina like N. 

 reticulata, an Qxycera of the size of Stratiomyx chameleon, and one 

 allied to Xylophagus ater ; a Microdon and an Ochthera. Of Diptera 

 with multiarticulate antennae, there are several Bibios, two Penthetriee, 

 some minute Sciarce, and one Platyura like P. cingulata. 



5. Neuroptera there are none. 



6. Dictyotoptera. Many Libellulee, some as large as JEschna grandis, 

 and their larvae are tolerably abundant. 



