54 Dr. A. E. Feoktistow on the Physiolocpj of the 



Odoiitorhopala. Purahrnchjtes. 



Pronotum witli the lateral angles Pronotuin witli the lateral angles 



produced in foliaceous lobes. moderately prominent and angu- 



larly rounded. 

 Abdomen strongly and abruptly Abdomen moderately and regu- 



dilated, especially at the fourth larly dilated in both sexes, 

 segment in both sexes. 



First joint of the anteunaj longer First joint of the antennte shorter 



than the second. than or subequal in length to the 



second. 



Other points of difference, but of a minor nature, are to be 

 found in the structure of the incrassated apices to the second 

 joint of the antennae. 



I am now able to add tlic description of Mdiat appears to be 

 a second species to the genus Odontorliopala. 



Odontorhopala Bergrotlii^ sp. n. 



$. Allied to 0. callosa^ Stal, but differing from the 

 description of that species by tlie following characters : — 

 The clavus is not black, but concolorous with the coriuui ; 

 the second joint of the antennae is not black, but is ochra- 

 ceous, with the apical incrassated portion only black, and the 

 sixth as well as tlie fifth segment of the abdomen is outwardly 

 toothed. 



Other characters not mentioned by Stal are as follows: — The 

 pronotum, clavus, and corium are not only coarsely punctate, 

 many of the punctures being black, but the lateral expanded 

 angles of the pronotum are ornamented with small black 

 tubercles on their upper surface which are continued in a more 

 obsolete manner across the disk. The spinous tubercles to 

 the femora and first joint of the antennaj are pale greyish in 

 hue. 



Long. 20 millim. ; max abd. exp. 10 millim. ; exp. pronot. 

 angl. 10 millim. 



Hah. Madagascar, Fianarantsoa. 



XIV. — On tlie Physiology of the Rattle o/'Crotalus duiissus. 

 By A. E. Feoktistow, M.I).* 



In June 1887 I received ten living specimens of Crotalus 

 durisfius, which I have since been able to observe closely. 

 Owing to want of a sufficient quantity of suitable food (the 



* Translated from the ' Melanges Biologiques tires du Bulletin de 

 rAcad(5mie Imperiale des Sciences de St. P^tersbourg,' t. xiii. livraison 1, 

 pp. 1-4 : St. Pdtersbourg, 1801. 



