128 
UROCER1D.1.. 
Cephus. 
C. pygmcBiis, Linn. i female, (sent to, and identified by .Mr. Ashmead.) 
C. bimacu/atus, Norton. 2 females. May 30th. 
One of these was ovipositing in a twig of Viburnum lentago. 
C trimaculatus, Say. 1 female. June i 6th. 
Oryssus. 
O. Sayi, Westwood. 1 male, 1 female. Maple. 
var. affinis, Harris 6 males. May 29th. June 13th. Maple, 
var. terminalis, Newm. 10 females. June 3rd, 23rd. Maple, 
var. occidentalism Cress. 1 male, 1 female. May 30th, 31st. Maple. 
Xiphvdria. 
X a/bicomis, Harris. 4 males, 15 females. June 16th, July 6. 
This species frequently attacks maples planted in the city streets. 
X. Provancheti, Cress. 1 female. June 15th. Maple. Hull. 
X. mfiventris, Cress. 1 female, (from Mr. Fletcher.) 
X. attenuate, Norton. 2 males. Basswood. 
Urocerus. 
U. cyaneus, Fabr. 2 males, 9 females. Sept. 16th, Oct. 2nd. 
U. albicornis, Fabr. 4 females. Aug. 22nd, 26th. 
c7. abdominalis, Harris. 12 males. June 22nd, Aug. 13th. Larch. 
These are probably the males of albicornis, although so different. 
U.jlavicornis, Fabr. 1 female, (coll. Mr. Fletcher.) 
Tremex. 
T. columba, Linn. 2 males, 17 females. July, Oct. 
This is a common species which badly infest^ old maples and 
beeches, and frequently emerges from sticks of firewood. Females may 
often be found which have not been able to withdraw their ovipositors 
from the wood in which they were boring, and have been held there 
until they perished. 
