8 JOURNAL OF ENTOMOLOGY AND ZOOLOGY 
times been written, Sirecini, Sirecine, and Sirecide; Tremicini 
and Tremicine, not Tremecini and T'remecine; and Xerini, not 
Xeriini. 
A Key To THE SUBFAMILIES AND GENERA OF SIRICIDE 
A. Labial palpi 3-segmented (Fig. 17) ; cerci present ; antennz filiform, 
seventeen- to twenty-five-segmented (Figs. 37 and 39) ; the radial 
cross-vein in the front wings received in the cell R, but never 
near its apex; posterior tibiz with one or two apical spurs. 
Siricinae 
B. Cornus of the female shouldered or not (Figs. 18-25), but 
never constricted at the base and then widened apically ; 
free part of Cu, usually distinct; head immaculate; poste- 
rior tibiz with two apical spurs. Sirex Linneus 
BB. Cornus of the female constricted at base and widened 
apically (Figs. 26-33) ; never more than a stump of the free 
part of Cu, present; a white spot present behind the eye. 
C. Posterior tibize with two apical spurs; ovipositor shorter 
than the abdomen. Urocerus Geoffroy 
CC. Posterior tibiz with one apical spur; ovipositor usually 
much longer than the abdomen. Xeris Costa 
AA. Labial palpi 2-segmented, very thick (Fig. 16); cerci absent; 
antenne short, four- to fourteen-segmented, or in a few oriental 
species as many as twenty-segmented, somewhat thickened in the 
middle; R. in the front wings absent, the radial cross-vein there- 
fore received in the united cells R,+, or if R, is present (Figs. 
9 and 10), then the radial cross-vein is directly opposite it; 
posterior tibize with one apical spur. Tremicinae 
B. In the front wings R, is lost (Fig. 9) ; posterior legs flattened 
in both sexes, but not greatly dilated; flagellum with four- 
teen or more segments. Tremex Jurine 
BB. In the front wings R, normally retained (Fig. 10) ; posterior 
legs flattened, the tibie and tarsi greatly dilated (Figs. 12 
and 13) ; flagellum reduced to three segments. 
Teredon Norton (Cuban) 
Sirex Linneus 
Sirex, gen. siricis, M. <oe.pyv= a wasp (Aristotle) derivatives: siric + 
(Figs. 1, 6, 15, 17, 18-25, 37, and 39) 
<1758 Ichnewmon Linnexus. Syst. nat.; ed. 10, v. 1: p. 560. 
1761 Sirex Linneus. Fauna suec.; ed. 2: p. 396. 
