1866.] Ill [Sanborn. 



Theridion roscidum. F\<^. 129, web with coooons. 



" sublatum. Fig. 113, under surface of abdomen. 



" ? trigonum. Fig. 117, lateral view; fig. 131, co- 



coons. Abdomen beneath variegated with rufous. 



Theridion verecundum. It always remains in the centre of its 

 web, feet uppermost. 



Mr. F. G. Sanborn exhibited an apple containing larvae and 

 pupae of a dipterous insect, presumed to be Jlolobrus mali 

 Fitch., the imago of which was unknown. The eggs were 

 supposed to have been laid in fresh apples, in the holes made 

 by the codling moth, Carpocapsa pomonella^ whence the 

 larvae penetrate into all parts of the apple, working small cy- 

 lindrical burrows about one-sixteenth of an inch in diameter, 

 causing the decay of the adjacent jsarts. So much injury 

 had been done in Wrentham, Mass., by this insect, that nine- 

 tenths of the apple crop were destroyed; they invariably in- 

 fested only those apples which had previously been attacked 

 by the codling moth. In the apple exhibited, there were two 

 pupae about ready to transform, and Mr. Sanborn hoped soon 

 to possess the parent insect. 



Prof A. E. Verrill stated that the Museum of Yale Col- 

 lege had received some dipterous larvae from Mono Lake in 

 California, a body of water not only excessively salt, but also 

 strongly alkaline ; together with them had been found a spe- 

 cies of Artemia, a genus of Entompstraca alHed to Branchi- 

 pus^ which had hitherto been known only in the salt-pans of 

 Europe. The dipterous larvae were found in immense num- 

 bers, but the fly had not been reared. He had also received 

 eggs, apparently of the same group of insects, from Salt Lake 

 in Texas ; the stick upon which they were laid was covered 

 with salt crystals. 



Mr. S. II. Scudder stated that Prof. Denton had seen dip- 

 terous larvae in lakes in the Rocky Mountains, which were 

 strongly impregnated with petroleum. 



