6 JOURNAL OF ENTOMOLOGY AND ZOOLOGY 



looked by him in fixing gigafi as type only through a clerical 

 error. Paururus having the same tj^e is therefore a synonym 

 of Sirex, and the old name Urocerus, long considered a syno- 

 nym of Sirex but having in reality a dit¥erent type, namely 

 gUjn.'i, must be resurrected for Sirex in the sense of recent 

 authors. 



The present genera tlien will be: 



SIREX, type juvcncits (=Paururus, Konow, Ashmead, and 



Rohwer). 

 UROCERUS, type gigas (== Sirex of Konow, Ashmead, and 



Rohwer). 

 XERIS, type spectrum. 



Jurine (1807) erected the genus Tremex for Sirex magus and 

 S. fuscicornis F. Latreille (1810) indicated the latter as t^je 

 of the genus. Xyloterus Hartig (1837) (not Ericlison 1836) 

 and Xylcecematium Ileyden (1868) («. n. for Xyloterus) both 

 have fuscicornis for their types and are synonyms of Tremex. 

 These names have been but rarely used. 



Norton (1869) proposed the name Teredon for Tremex lafi- 

 tarsis and T. cuheusis Cresson. Kirby (1882) proposed Tere- 

 donia to replace Teredon on the mistaken conclusion that the 

 hitter was preoccupied. Teredon, however, is a valid name. 



The Taxonomy of the Geneea 



Ashmead (1898) recognizes two subfamilies, Siricinfe and 

 Tremecinai, allying Xeris with Tremex and Teredon in the 

 latter. That is an unnatural alignment, brought about by the 

 unfortunate selection of characters which he used in separating 

 the subfamilies. The first of these is the variation in the 

 caudal end of r-m in the front wings which may be upon the 

 longitudinal or again ui>on the transverse part of media. But 

 we find the same variation within single species; it is in fact a 

 character upon which no reliance can be placed in the Siricida?. 

 The second character is the presence of one or two apical spurs 

 on the posterior tibia?. Konow (1905) recognizing Siricidae in 

 tlie present sense as a sul)family, divides it into two tribes, cor- 

 responding exactly to the divisions employed by Ashmead. 



