OF WASHINGTON. 233 
Florida. I found it quite abundantly in May along Biscayne Bay, exclu- 
sively on Persea carolinensis, and have strong evidence that the larva is 
inquilinous in the galls of a Psyllid, Trioza magnolia. Within these 
galls I found frequently either a large egg or a young larva of a Curculio- 
nid, and I do not hesitate to consider these as belonging to this Conotra- 
chelus, since the larva of another species of the genus (C. posticatus) has 
been observed to live within Homopterous (Phylloxera) galls. 
Cryptorhynchus obliquus breeds in Hickory branches which are broken 
by the wind or otherwise injured. The larva makes a tolerably straight 
gallery several inches long through the solid wood of the twig. 
Cryptorhynchus brackialis breeds in twigs of Bumelia lanuginosa. 
Cryptorhynchus ferratus. This is a common species, which, near Wash- 
ington, can be obtained from Oak, Chestnut, and various other trees. It 
extends to the semi-tropical region of Florida, but infests there only the 
branches of Persea carolinensis, and is never met with on the Oak. 
Cryptorhynchus tristis develops under the bark of the trunk of ^tiercus 
coccinea. The imago feeds on the leaves, but is strictly nocturnal, hiding 
duri ig day time in the ground at the base of the tree. 
Chalcodermus ceneus occurred in great number in semi-tropical Florida 
on a species of Dolichos (probably the common Cow-pea run wild), the larva 
infesting the pods of the plants. 
Acamptus rigidus. This resembles in breeding habits certain Calandrid 
genera (Phlccophagus, Stenoscelis, Wollastonia'). On the trunks of various 
trees we frequently see larger or smaller spaces deprived of bark. The 
bark has not been chopped or taken off by force, but I think these decor- 
ticated places are caused by the influence of frost. The wood on such ex- 
posed places is always dead for some distance inward, and often very hard. 
In this case it attracts certain Ptinid beetles to bore and oviposit therein, 
but frequently the dead wood becomes affected by a kind of rot, which 
causes it to be soft, moist, and of a reddish color. It is in such cases that 
the Calandrtdce above mentioned and Acamptus rigidus undergo their 
development in the rotting wood. 
Copturus binotatus. This rare species is, in Mr. Ulke's and my own ex- 
perience, confined to Gleditschia triacantkus, but I cannot tell whether it 
develops in the thorns or in the branches. 
Plocamus hispidulus was bred by me in June from dead branches of Ro- 
binia pseudacacia infested with Agrilus larvas. 
Himatium errans occurred abundantly at Tallahassee, Fla., in April, in 
the deserted galleries of Tomicus cacographus under bark of Pinus pa- 
lustris. 
Himatium conicum breeds within the bark of Liriodendron tulipiferum, 
numerous specimens having been thus found by me near Washington. 
I). C., in autumn. The two North American species of this genus can 
be distinguished only with difficulty. 
Dr. Marx called attention to anew organ in the female of Fill- 
