8 JOURNAL OF ENTOMOLOGY AND ZOOLOGY 



times been written, Sireeini, Sireeinse, and Sirecicte; Tremicini 

 and Troniicin:r, not Tremeoini and Tremecina'; and Xerini, not 

 Xeriini. 



A Key to the Sltbfamilies and Genera of Siricid^ 



A. Labial palpi 3-segmented (Fig. 17) ; eerci present; antennae 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 tibiiu with one or two apical spurs. 



Sirieinae 



B. Cornus of the female shouldered or not (Figs. 18-25), but 

 never constricted at the base and then widened apically; 

 free part of Cuj usually di.stinct; head immaculate; poste- 

 rior tibiiv with two apical spurs. Sirex Linna-us 



BB. Cornus of the female constricted at base and widened 

 apically (Figs. 26-33) ; never more than a stump of the free 

 part of CUo present ; a white spot present behind the eye. 



C. Posterior tibia' with two apical spurs ; ovipositor shorter 

 than the abdomen. Urocerus Geoffroy 



CC. Posterior tibiai with one apical spur; ovipositor usually 

 much longer than the abdomen. Xeris Costa 



AA. Labial palpi 2-segmented, very thick (Fig. 16); cerci absent; 

 antennte 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 Rj-j-.- or if R., is present (Figs. 

 9 and 10), then the radial cross-vein is directly opposite it; 

 posterior tibiae with one apical spur. Tremieinae 



B. In the front wings R., is lost (Fig. 9) ; posterior legs flattened 

 in botli sexes, but not greatly dilated ; flagellum with four- 

 teen or more segments. Trcmex Jurine 



1111. In the front wings Rr, normally retained (Fig. 10) ; posterior 

 legs flattened, the tibia' and tarsi greatly dilated (Figs. 12 

 and 13) ; flagellum reduced to three segments. 



Tciudon Norton (Cuban) 



Sirex Linnfens 



Sirex, (/en. siri<-is,M. ■ (Tuprjv= a wasp (Aristotle) (hriratires : siric + 



(Fig-s. 1, (), L5, 17, 18-25, ;17, and :^9) 



<1758 Irhvdimon Linnams. Syst. nat. ; ed. 10, v. 1 : p. 560. 

 1761 .S'iVr.r Linuani.s. Fauna suec. ; ed. 2: p. 396. 



