Scudder.J 510 [April 28, 



have been by some assumed to be paleozoic strata in an altered con- 

 dition, and tlie stratigrapbical equivalents of the fossiliferous Lower 

 Cambrian rocks of Vermont. There has long existed a notion 

 among many of our geologists, that there is nothing in New England 

 below the mesozoic which is not included in the categories of the 

 New York system, and that our great and varied series of crystalline 

 stratified rocks, if not of the Laurentian gneiss of the Adirondacks, 

 can be nothing else than members of the New York system altered 

 in some mysterious manner. He had, for many years, endeavored 

 to teach what he conceived to be correct views on this point, and had 

 shown the existence between the proper Laurentian and the Lower 

 Cambrian of several series of crystalline stratified rocks, which play 

 a conspicuous part in the geology of eastern North America, and in 

 various parts of this and other continents. He referred for further 

 details to a paper on " The Geology of New England," in the Amer- 

 ican Journal of Science for July, 1870. 



Section of Entomology. April 28, 1875. 



Mi\ H. L. Moody in the chair. Seven persons present. 



The following paper was presented : — 



A Century of Orthoptera. Decade IV. — Acrydii. By 

 Samuel H. Scudder. 



31. Chloealtis brunnea. Brown, sometimes tinged with yel- 

 lowish, sometimes brownish -green. Head and prothorax rather 

 abundantly but obscurely flecked with brownish atoms, the sides of 

 the face above and the upper limit of the lateral lobes of the prono- 

 tum blackish. It differs from C. viridis Scudd., to which it is closely 

 allied, in the greater tumidity of the summit of the head, the broader 

 vertex between the eyes, which is less hollowed but slightly more 

 declivant, and the less prominent veins upon the dorsal area of the 

 closed tegmina; it seems never to be of so vivid a green. 



Length of body, cf, 19.5 mm.; ?, 29 mm.; of tegmina, d 1 , 9 mm.; 

 $, 11.5 mm.; of hind femora, cf, 12 mm.; ?, 16 mm. 1 <S . 3 ? 

 taken October 1, at Dallas, Texas, by J. Boll. 



