JOUENAL OF ENTOMOLOGY AND ZOOLOGY 7 



Eohwer (1911b) attains a more natural arrangement by placing 

 Xeris in the Siricinse. His arrangement is as follows: 



"AntennfB long and slender, basal vein received near the middle 

 of the first diseoidal cell; second transverse cubitus present. 



Sirecinae 



"Hind tibiffi with two ealcaria; humerus [2d A] and transverse 



median of the hind wings present. Sirecini 



"Hind tibije with one ealcaria [sic (!)]; humerus [2d A] and 



transverse median of the hind wings wanting. Xcrimi 



"Antenna^ short and stout; basal vein and transverse median in- 

 terstititial, or nearly so; second transverse cubitus wanting. 



Tremecinae" 



The basal vein (Fig. 8&) is m-cn, and the first diseoidal cell in 

 the sense of Cresson, Marlatt, and others, M4, which, of coiirse, 

 can not receive m-cu. Evidently Rohwer means here, cell Cu,. 

 Examining the several figures of wings here presented (Figs. 

 6-11) it will be noted that on this character the wing of Xeris 

 would fall doubtfully into the Tremicinae and the wing of Teredon 

 clearly into Siriciua?, resembling closely in this respect the 

 wing of Vrocerus flavicornis. The second transverse cubitus 

 (Fig. 8tc^) is Es, and this is frequently, probably normally, 

 present in Teredon, which would thereby fall into the Siricinse. 



There are, however, two important characters which all 

 authors have overlooked in differentiating the subfamilies. 

 Sirex, Urocerus, and Xeris have 3-segmented labial palpi (Figs. 

 4, 5, and 17), and retain the cerci. Tremex and presumably 

 Teredon (although lack of material makes verification impos- 

 sible) possess 2-segmented labial palpi (Fig. 16) and have lost 

 the cerci. 



A further discussion of the relations of the genera would 

 occupy too much space, and I shall reserve it until a later date. 



The Forms of the Names 



Under each genus I have indicated its derivation, gender, and 

 stem to be used for derivatives. The following forms are the 

 proper ones : Siricini, Siricinse, and Siricidse, not, as has some- 



