1881.] 
167 
[Scudder. 
tools. Whoever will devise and apply a method of investigating 
the constitution and motion of the neve region of the Swiss gla- 
ciers, will be entitled to the gratitude of all students of glacial 
phenomenon. A thorough going series of observations upon a well 
selected glacier which shall tell us every feature of its history for 
a term of say twenty-five years, seems to me more likely to advance 
our knowledge of glacial problems than any other enquiry now 
open to students. 
Section of Entomology. March 23, 1881. 
Mr. S. H. Scudder in the chair. Eight members present. 
Mr. S. H. Scudder called attention to a second carboniferous 
insect (Lithosialis bohemica) allied to an English sjiecies whose 
affinites he had discussed at a recent meeting^. 
This second species was described by Dr. O. Novak 1 under the name of 
Gryllacris bohemica, and was more perfect than the English “ Gryllacris 
Brongniarti,” being very nearly complete. Following Swinton, Novak had 
referred the insect to the Ortlioptera, but the illustration given by Novak 
afforded new proof that G. Brongniarti as well as the Bohemian species 
should be referred to Neuroptera. Not only was the marginal vein prickly, 
as in G. Brongniarti, but the same was true of the other veins, and this 
perhaps accounts for the mistaken reference of certain veins in G. Brong- 
niarti to a file or stridulating organ. The course, division and relative sep- 
aration of all the veins are almost identical in the two wino;s, showing that 
the Bohemian insect should be referred to the genus Lithosialis proposed at 
the recent meeting of the Society, and so bear the name Lithosialis bohem- 
ica. Mr. Scudder also pointed out that Novak had called the mediastinal 
vein the front branch of the scapular, and had wrongly made two veins out 
of the anal vein. 
1 Jahrb. k. k. geol. Reichsanst., Bd. xxx, S. 69. Taf. 2. 
