158 SEVENTEENTH Report STATE ENtomMoLocist oF MINnNESoTA—1918 
near the tip, and altho so closely adjusted to the borer or upper 
piece of the tube as to appear to form one solid whole with it, they are 
said to be capable of separate motion. 
The Siricidae are the Uroceridae of authors. Something like 
fifty species are known in this country, amongst them occurs the well- 
known Pigeon Tremex, 7. columba. 
The females of this species have a boring ovipositor or horn, pro- 
jecting from the abdomen. With this, a hole is drilled in solid wood 
and an egg is deposited therein. This pest attacks apple, maple, beech, 
oak, elm, pear and other trees ; is apparently partial to the elm. It is kept 
fairly well in check by parasites. Females, when egg-laying, 
are sometimes unable to withdraw their ovipositors and are prisoners 
until death relieves them. The larva, when full grown, is 1% inches 
long; it transforms in a cocoon made of silk and fine chips, and when 
ready to emerge, gnaws through the bark and flies away. 
The genus Sirex is a wood borer and may pass so long a period 
in wood that it is brought into a house in furniture. An instance is 
cited where from wood, supposedly brought from Canada and made 
into a house in England, Sirex emerged, to the great terror of the oc- 
cupants. Sirex is often found in dried wood incased in metal, and 
has been known to gnaw its way through the metal. Tremex columba 
L., Sirex edwardsii Brulle, and Urocerus albicornis Fab. occur in this 
state. 
XxTPAYDRWDAE 
Hind margin of pronotum, mesonotum, metanotum, metapostnotum, antennae, 
forewings, scutel, proepimeron, spurs of fore tibiae, exsertion of the sheath and junc- 
tion of the cubitus with the basal vein, as in Siricidae; notauli present; mesoscutum 
without oblique sutures from the tegulae to the fore margin of the scutel; pronotum 
very short medially and not angulate laterally; apex of abdomen normal; fore wings 
with an intercostal vein. 
Larva without feet. Inhabits and lives on the dead or dying 
wood of various trees. Pupa changes in the same situation. 
Xiphydria maculata Say and X. erythrogastra Ashm. are found 
in Minnesota. 
CIMBICIDAE 
Hind margin of pronotum, mesonotum, metanotum, metapostnotum, insertion 
of antennae and number of cubital cells in fore wings as in Siricidae; scutel never 
completely separated from the mesoscutum by a suture, the suture always wanting 
laterally, proepimeron present; fore tibiae with two apical spurs; cubitus joining or 
touching the basal vein very close to the costa; mesoprescutum always present; first 
perapterum present; abdomen sharply angled laterally, the tergites, laterally with 
a dorsal and ventral aspect; antennae clavate. 
The American Sawfly, or Elm Sawfly, Cimbex americana, is a 
common species of general distribution, feeding on willow, basswood, 
elm, birch and allied trees. The yellowish green larva has a black 
