OF WASHINGTON. 13 
Acmceops. The left front leg has three tarsi, the two addi- 
tional ones originating, not as is usual in such cases from the 
tip of the tibia, but from the tip of the first joint of the regular 
tarsus. 
Mr. Schwarz exhibited a specimen of a rare Curculionid, 
Hilipus squamosus, found in southern Georgia. 
Mr. Howard mentioned a curious instance of irregular develop- 
ment of the wings in a Chalcid. The specimen described is in 
the collection of Dr. Riley, and is a female of Isosoma tritici^ 
The fore-wings are represented by mere rudimentary pads, while 
the hind-wings are fully developed. The rule in this species is 
no wing development whatever, but occasionally a fully winged 
specimen occurs. 
NOVEMBER 6, 1884. 
Ten members present. President Riley in the chair. 
Mr. Hubbard read a paper on the habits of Hypotrichia 
spissipes as observed by him at Crescent City, Florida. He 
exhibited a specimen of this rare Lamellicorn beetle which had 
impaled itself upon a spear of grass, and called attention to the 
thinly chitinized structure of the male which rendered it liable 
to such accidents. The rapid flight of the male and its habit of 
seeking out the female by burrowing into the sand was noted. 
Mr. Hubbard then remarked upon the sexual differences in this 
and the allied genus Plectrodes, and pointed out the close rela- 
tionship of both forms with Pleocoma, a genus which has been 
placed by LeConte among the Scarabaeidae pleurosticti. 
Mr. Hubbard made a communication on the life-history of 
Mallodon melanopus and the dwarfing of oaks caused by the 
larva of this large Cerambycid. The larva lives in Florida in 
the roots of highland varieties of the Live Oak {Hierctis 
virens} and forms a sort of root-gall, reducing the tree to a clus- 
ter of shoots. The insect being common throughout Florida, 
large tracts of land which might become forest thus remain bar- 
ren oak shrub in consequence of its attacks. 
Dr. Riley remarked that his own and Mr. Geo. Noble's obser- 
vations in the vicinity of Savannah, Ga., had corroborated Mr. 
Hubbard's experience. 
