16 journaij of entomology and zoology 



Key to the Eaces of Sibex nigricobnis 



Legs entirely blue-black. pinicola (Ashniead) 



Legs basally iilue-blat-k, the tilii;v and tarsi red. iiigricfirnis Fabrieius 



Eace nigricurnis Fabricius 



(Fig. 24) 



1781 Sirex nigriconiis Fabrieius, 9 ■ Spec, insec. ; v. 1 : p. 413. 



1869 Uroccrus nigricornis Norton, ? S ■ Cat. deser. Tenthredinidtu 



and Urocerida^ N. A. < Trans. Anier. ent. soc. ; v. 2 : p. 3.59. 

 1874 Sircx morio Westwood, ?. Thes. ent. oxon. ; p. 115; pi. 21, f. 6. 



Distribution: From New York to Delaware. 



Eace pUiiruhi (Aslimead) 



1898 I'aurKrKs piiticolus Ashniead, 9. Class, horn-tails and saw-dies. 



<Can. ent; v. 30: p. 179. 

 1898 Paururus mgricornis Konow. Syst. u. krit. Bearb. d. Siric.-Trib. 



Siricini. < Wien. ent. Zeit. ; v. 17 : p. 270. 

 1904 Paururus pixicola Ashniead, $. Deser. of four new horn-tails. 



< Can. ent. ; v. 36 : p. 64. 



Konow lias pointed out that piiiicolo is a Latin substantive, 

 and can not lie changed to pinicolus. 



Distribution : From "West Virginia to Florida. 



Sirex behroisH (Cresson) Kirby 



(Figs. 1 and 25) 



1880 Uroccrus hclircnsii Cresson, ? . Deser. new N. A. Hyni. in coll. 

 Amer. ent. soc. < Trans. Anier. ent. soc. ; v. 8 : p. 35. 



S . ^ In the male which lias not heretofore been described the 

 smoky liand beneath the stigma is wanting, the smoky margin 

 at the apex less pronounced; the liase of the antenn?e red; the 

 coxtT black, the rest of the legs reddish l)rown; 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. 



Itelated to iiigriconns. The color of the wings seems to be 

 quite constant. 



Distribution: Known from California (Berkeley, Sept. 1906, 

 J. C. Bradley) and Nevada. 



