746 GEOLOGY OF OLD HAMPSHIRE COUNTY, MASS. 



at all ill that genus, or, in fact, in any other of the American Clythrini. 

 The elytra differ from those of *S'. samia mainl}' in having the abbreviated 

 apex less rounded and more squarely truncate, the inner apical angle espe- 

 cially being far more angulate; as there, both outer and sutural borders are 

 delicately margined, and the general proportions of the elytra are much the 

 same (in this respect resembling it rather than our other species of Saxinis), 

 but they are a little and gradually narrowed on the apical half, while nearly 

 equal in 8. saucia; besides the punctures which adjoin the outer margined 

 border, the elytra have ten very straight and regular equidistant series of 

 delicate punctures, which are short oval, those in each row separated from 

 their neighbors by more than, usually about twice, their own length, and 

 the general surface is sparsely covered with excessively delicate hairs 

 scarcely longer than the punctures. The general color is a uniform shining 

 piceous with a slight greenish, metallic tinge, the metallic green being 

 decided in the punctures. The last abdominal segment shows a slight dull 

 median ridge. 



Length of body, 8""™; of elytra, 6.5 "'™; breadth of base of prothorax, 

 3.1 """'; of each elytron, 2.5 """. 



THE REPItIjSION OF TKIBUTARIES.i 



Oscar Peschel,^ from his orographic studies, notes the tendency of a 

 tributarj^ to run a long distance near and nearly parallel to its primary. In 

 all the tributai'ies which enter the Connecticut across the broad lake deposits 

 between Mount Toby and Mount Holyoke this is very marked. They all 

 run out through the old bordering l^ench (1 s h) in deep gorges, then take a 

 straight coui-se down over the old lake bottom (1 h t), following its slope, but 

 when they reach the oldest terrace flat formed by the river in its oscillations 

 after the shrinking of the lake, they bend abruptly south and continue as 

 far as possible to run nearly parallel to the main stream, and when they 

 enter the latter it is by a sudden bend at right angles. This will be clearly 

 seen by an inspection of the map (PI. XXXV, in pocket), or of the North- 

 ampton and Belchertown sheets. 



First, the brooks north of Sunderland village, on the east side of the 



' See PL XXXV, in pocket at end of volume. 

 2 Vergleichende Erdkunde, 1878, p. 141. 



