OF WASHINGTON. 57 
Lugger added that Osmoderma requires two full years from the 
egg state to maturity. 
Mr. Howard presented a paper on the larval habits of the 
Trichopterous genus Hydropsyche, as observed by him in the 
month of August in the vicinity of Washington.* 
Mr. Schwarz added that in a small creek on the Virginia side 
of the Potomac he had observed vast numbers of a Trichopterous 
net which seemed to differ from that described by Mr. Howard. 
It is cup-shaped, without any terminal tube, and fastened with 
one side to large rocks in places where the water falls in a thin 
sheet vertically or nearly vertically over the rocks. There were 
no larvae in the webs at the time of the observation, toward the 
middle of September. 
Mr. Lugger spoke about the fauna of the island of Abaca, one 
of the Bahama Islands : 
Some members of the Johns Hopkins Zoological Laboratory had made a 
small and superficial collection of insects, etc., during their stay upon 
that island. The following list comprises the whole of the collection : 
Cycloneda sanguinea Linn. Chion cinctus Dr. 
Carpophilus pallipennis Say. Callichroma plicatum Lee. (?) 
dimidiatus Fabr. Acanthoderes decipiens Hald. 
Monocrepidius lividus De G. Bruchus obsoletus Say. 
Chauliognathus marginatus Fabr. Glyptotus cribratus Lee. 
Lachnosterna (two species). Cistela sericea Say. 
Cyclocephala immaculata Oliv. Isomira sp. 
" punctata (a Cuban Nacerdes melanura Linn. 
species). Oxacis dorsalis Melsh. 
Chalepus obsoletus Lee. Pachnaeus sp. (a Cuban species). 
Eburia stigma Oliv. Calandra granaria Linn. 
Looking at the species before him, he was struck by their great similar- 
ity to those of the fauna of the sea-coast of Maryland or Virginia. In fact, 
the great majority of them could be collected there as well as upon the 
island of Abaca. The few wasps and ants are not North American; the 
two Hemiptera collected are both North American. The terrestrial snails, 
however, of which quite a number had been gathered, were entirely differ- 
ent from any found in the United States ; all belonged to the Cuban fauna, 
with, perhaps, the exception of a small Pupa. 
Mr. Schwarz remarked that a small collection of insects made 
* This paper has been published in the Report of the Comm. of Agric., 
1886, p. 510. 
