16 JOURNAL OF ENTOMOLOGY AND ZOOLOGY 
Kry to THE Races or SIREX NIGRICORNIS 
Legs entirely blue-black. pinicola (Ashmead) 
Legs basally blue-black, the tibiz and tarsi red. _nigricornis Fabricius 
Race nigricornis Fabricius 
(Fig. 24) 
1781 Sirex nigricornis Fabricius, 2. Spee. insec.; v. 1: p. 413. 
1869 Urocerus nigricornis Norton, 9 8. Cat. deser. Tenthredinide 
and Uroceride N. A. < Trans. Amer. ent. soc.; v. 2: p. 359. 
1874 Sirex morio Westwood, @. Thes. ent. oxon.; p. 115; pl. 21, f. 6. 
Distribution: From New York to Delaware. 
Race pinicola (Ashmead) 
1898 Paururus pinicolus Ashmead, ?. Class. horn-tails and saw-flies. 
< Can. ent.; v. 30: p., 179. 
1898 Paururus ngricornis Konow. Syst. u. krit. Bearb. d. Siric.-Trib. 
Siricini. < Wien. ent. Zeit.; v. 17: p. 270. 
1904 Paururus pinicola Ashmead, ¢. Deser. of four new horn-tails. 
< Can. ent.; v. 36: p. 64. 
Konow has pointed out that pinicola is a Latin substantive, 
and can not be changed to pinicolus. 
Distribution: From West Virginia to Florida. 
Sirex behrensii (Cresson) Kirby 
(Figs. 1 and 25) 
1880 Urocerus behrensti Cresson, 9. Deser. new N. A. Hym. in coll. 
Amer. ent. soc. << Trans. Amer. ent. soc.; v. 8: p. 30. 
3. ## In the male which has not heretofore been described the 
smoky band beneath the stigma is wanting, the smoky margin 
at the apex less pronounced; the base of the antenne red; the 
coxe black, the rest of the legs reddish brown; the abdomen 
except the basal two segments red; the free margin of the 
eighth dorsal segment sufficient to conceal the tenth, even when 
the latter is extended. 
Related to nigricornis. The color of the wings seems to be 
quite constant. 
Distribution: Known from California (Berkeley, Sept. 1906, 
J. C. Bradley) and Nevada. 
