162 Miscellaneous. 



L. Salimbeni. — The corpuscular moth of the Silkworm. 



D. Ragona. — On the Ozonometric Coefficients of Humidity and 

 Temperature. 



G. Generali. — On a calculus from the Urinary Bladder of an Ox. 



A. Ghiselli. — On the successful application of local Ansesthesia in 

 a case of Lameness in a Horse caused by Rheumatism. 



G. Grimelli. — Meteorological method of foreseeing and predicting 

 Aqueous Meteors. 



F. Coppi. — Notes upon some Crystallized Fossils and upon the 

 locality in which they are found in the Modena district. 



G. Canestrini. — Researches on the Labroids of the Mediterranean. 

 — On some ancient Skulls found in the districts of the Trentino and 

 Venice. 



P. Eonizzi. — On the Reproduction of Pholcus phalancjoides,WaiQk. 

 G. Mayr. — Formicicke novre Ainericanse collectoe a Prof. P. de 

 Strobel. 



E. Stoehr. — Some Observations on the Natural History of Shelly 

 Clays. 



G. Canestrini. — New Italian Arachnida. 



MISCELLANEOUS. 



Considerations drawn from the study of Mole- Crickets, 

 By Samuel H. Scudder. 



Mr. S. H. Scudder stated that he had recently been studying the 

 mole-crickets with a view to their classification, and found that they 

 were naturally divisible into two groups. For one he retained the 

 name of Gryllotalpa, under which all the species had formerly been 

 grouped ; to the other he applied that of Scapteriscus. These two 

 groups were separated by the following characteristics. 



In Scapteriscus the posterior margin of the sternum of the eighth 

 abdominal segment of the S is produced into a stout prominent 

 central tooth ; in Gryllotalpa the margin is entire. 



The mesosternal ridge of Gryllotalpa is prominent, and almost 

 equally so throughout ; that of Scapteriscus is never prominent on 

 the anterior half of the segment, and is often limited to the posterior 

 half, or is even obsolescent. 



The fore trochanter of Scapteriscus is large; the free portion 

 almost always equals the tibial dactyl in length, and is of about the 

 same size at the tip as at the base ; that of Gryllotalpa is propor- 

 tionally small, seldom exceeding half the length of the tibial dactyl ; 

 the form is cultrate or lenticular. 



Scapteriscus is furnished with only two fore tibial dactyls, both 

 of which are moveable ; Gryllotalpa has two moveable dactyls and 

 a second pair which are immoveable. 



"With but few exceptions the hind femora of Scapteriscus more 

 than equal the pronotum in length, while in Gryllotalpa they are 

 always shorter than the pronotum. 



