20 PvEPoiiTs. 



Mai son de Bas, Vale. 



A dyke of red granite, also a])parently identical with 

 the Cobo Rock, has been traced from La Folic Road to 

 Messrs. Collas's Quarry at Maison de Bas. Its direction 

 is roughly 8.W. to N.E. It is a})out 4 feet in thickness, 

 and is accompanied by smaller veins, the Avhole being intru- 

 sive in diorite. 



North Clifton, St. Peter-Port. 



The construction of a drain in this locality, shows that 

 the rock here is diorite. It appeared much disintegrated 

 as exposed in the excavations, which were about 10 feet 

 in depth, but nodules of less decomposed rock remained. 



ALDERNEY. 



The junction of the sandstone and granite to the West 

 of the Sandstone Quarry on the S.W. Coast of Aiderney 

 has been revisited. This junction is only visible in a few 

 spots through the covering of soil. The sandstone does not 

 shov^^ any signs of coarseness, such as might have been 

 expected, if it had been directly deposited on the granite, 

 nor on the other hand does it appear altered, as if the 

 granite had been intrusive. The strata of the sandstone 

 appear in some places to be cut off by the granite, in 

 others to be somewhat disturbed. The granite is much 

 more decomposed than the sandstone. Some faulting has 

 doubtless occurred. 



C. G. De La Mare, Sec. Geol. Sect. 



REPORT OF THE ENTOMOLOGICAL SECTION. 



During the past season a great deal of attention has been 

 paid to the Aphides occurring in this island, with the result 

 that thirty-five species have been added to the list of Guernsey 

 insects. 



Sphinx convolvuli (the Convolvulus Hawk Moth) has 

 been very scarce. I have not seen a single specimen, and 

 none have been brought to me, or to the Museum. The Rev. 

 F. E. Lowe says that he has been struck with its absence this 

 season. Acherontia atropos (the Death's Head Moth) has not 

 been so common as usual. A full-grown larva was brought to 

 me from L'Ancresse Common during August, and on 

 October 5th a specimen of the perfect insect was picked up 

 dead at the White Rock, 



