ERIOPTERA. 153 



veiu, are not in one line with the small cross-vein, tut much nearer 

 to the root of the wing (Tab. I, fig. 19): subgenus Molophilus. 



The peculiarities of the venation of this group are : 1. That 

 the second longitudinal vein emits the third, not from its main 

 stem, as usual, but from its posterior branch (as in some species 

 of Amalopis) ; hence the first submargiual cell is longer than the 

 second ; the latter, in all the species which I have seen, has its 

 inner end in one line with the inner end of the first posterior 

 cell, both inner ends being nearly square ; the first submargiual 

 cell has usually a somewhat rounded inner end, and the marginal 

 cross-vein is but a short distance beyond it ; in E. ursina nearly 

 in one line with it ; 2. That the first bifurcation of the fourth 

 longitudinal vein takes place at a considerable distance before 

 the small cross-vein, and that the great cross-vein is also removed 

 backwards to a corresponding distance ; the consequence is, that 

 the inner ends &f the second and fourth posterior cells are nearer 

 to the basis of the wing than the inner ends of the first posterior 

 and of the submargfnal cells. The djscal cell seems to be always 

 open (this is the case with the North American species, as well 

 as with the European species, which I find mentioned in the 

 authors). The third posterior cell is rather long in most species, 

 and has its inner end more or less opposite that of the first 

 posterior cell ; in E. ursina, however {and pr51>ably in the related 

 European species), it is much shorter. 



Dr. Schiner has i-etained the name of Erioptera for this sub- 

 division, but this name is more properly applied to another group. 

 As Molophilus, a generic name pi'oposed by Mr. Curtis for a 

 species of this group with very short wings, unfit for flying, 

 cannot well be retained in this narrow sense, we may apply it to 

 the whole group. 



Table for determining the species. 



/The prwfurca ends in the second submargiual cell (Tab. 1, fig. 16, 17, 



l] 18). 2 



I The prffifurca ends in the first submargiual cell (Tab. I, fig. 19). 13 



The discal cell, when open, coalesces with the second posterior cell 



(Tab. I, fig. 16) ; when closed, the inner ends of the second and 



third posterior cells are not in one line, the inner end of the latter 



being anterior (Tab. I, fig. 17, 18). 3 



The discal cell, when open, coalesces with the third posterior cell ; 



I when closed, the inner ends of the second and third posterior 



»• cells are nearly in oue line. 12 



