6 JOURNAL OF ENTOMOLOGY AND ZOOLOGY 
looked by him in fixing gigas as type only through a clerical 
error. Paururus having the same type is therefore a synonym 
of Sirex, and the old name Urocerus, long considered a syno- 
nym of Sirex but having in reality a different type, namely 
gigas, must be resurrected for Sirex in the sense of recent 
authors. 
The present genera then will be: 
SIREX, type guvencus (—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. fuscicorms F. Latreille (1810) indicated the latter as type 
of the genus. Xyloterus Hartig (1837) (not Erichson 1836) 
and Xylecematium Heyden (1868) (n. n. for Xyloterus) both 
have fuscicorms for their types and are synonyms of Tremex. 
These names have been but rarely used. 
Norton (1869) proposed the name Teredon for Treme2: lati- 
tarsis and T. cubensis Cresson. Kirby (1882) proposed Tere- 
donia to replace Teredon on the mistaken conclusion thai the 
latter was preoccupied. Teredon, however, is a valid name. 
Tur TAXONOMY OF THE GENERA 
Ashmead (1898) recognizes two subfamilies, Siricine and 
Tremecine, 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 upon 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 Siricide. 
The second character is the presence of one or two apical spurs 
on the posterior tibiae. Konow (1905) recognizing Siricide in 
the present sense as a subfamily, divides it into two tribes, cor- 
responding exactly to the divisions employed by Ashmead. 
