16 ENTOMOLOGICAL SOCIETY 
advised the non-use of electric light during August, September 
and October. 
Prof. Riley also presented a list, prepared by Mr. Marx, of the 
species of Arachnida thus found, and stated that most of them 
were probably aerial species, /. ., species having gossamer habits. 
Mr. Marx added some remarks on these spiders and on the fami- 
lies in which gossamer habits have been observed. 
o Mr. Hubbard read a paper on the discovery of a species of An- 
ophthalmus in Luray Caverns, Virginia. The only specimen ob- 
served was found in the immediate vicinity of an electric light about 
half a mile from the entrance of the cave and proved to be identical 
with A. tenuis, which was hitherto known only from Erhard 
Cave in Montgomery Co.. Virginia, at least 140 miles distant 
from Luray. Mr. Hubbard added some remarks upon the geo- 
graphical distribution of the North American species of Anoph- 
thalmus, there being only one known from Virginia, five from 
Kentucky, and two from Indiana ; further, on their mode of living 
and the mode of collecting them. 
Mr. Schwarz spoke on parasitic Coleoptera, enumerating the 
different modes of parasitism known to occur in that Order. He 
mentioned (i) species known to be parasitic only in the imago 
state, as exemplified by the genera Platypsyllus, Leptinus and 
Amblyopinus ; (2) genuine parasites, as exemplified by the 
family Stylopidae and the genus Rhipidius ; (3) the ]\Ieloidce and 
most of the Rhipiphoridce, which present in the larva state a 
much less pronounced parasitism ; (4) some isolated cases still 
more leaning toward predaceous habits, as exemplified by the 
genus Trichodes and by Brachytarsus scabrosus. 
Dr. Riley said that he missed Aleochara ant homy ice in the 
enumeration of parasitic Coleoptera, and thinks that its parasitic 
nature is well established by Mr. Sprague's observations. Mr. 
Schwarz replied that from analogy with the known habits of 
other Aleocharinae he considers this Aleochara to be merely a 
predaceous species. 
A discussion on the terms commensalism and parasitism fol- 
lowed. 
Mr. Hubbard mentioned in this connection the probable occur- 
rence of Platypsyllus castoris in the Lake Superior region as 
reported by beaver hunters. 
