SUB-FAMILY EUCOELINA. 193 



closed or open nature of the radial cellule may be so 

 used, although it may be said that, as in the case of 

 some species of Eucoela and Trybliographa, we sepa- 

 rate them, although they may agree in other respects, 

 because they differ in this single point ; that is to say, 

 we find the same differences in the antennal structure 

 in both groups. The presence of the parapsidal furrows 

 is another fact which is useful in generic separation. 

 The only feature shown by the abdomen is that a few 

 species want the hair fringe, and as these on the whole 

 show certain other differences, I am inclined to place 

 some faith in its ge aerie usefulness. 



There is no doubt that Foerster has logically carried 

 out the views of the analytic school ; but when we 

 find that the system must lead to the creation of an 

 unlimited number of " genera," and when further we 

 at present know practically only the European species, 

 and when even with the European species the system 

 frequently fails from the number of intermediate 

 forms, while again it only applies to one sex, one is 

 hardly prepared to accept it as satisfactory. That, 

 however, after all is a matter of personal opinion, 

 upon the opinion whether synthesis or analysis is to 

 be the guiding factor in generic creation. A transla- 

 tion is given of Foerster's generic synopsis, and, so far 

 as his "genera" concern our fauna, further details 

 are given of them. 



Synopsis of Genera after Foerster. 



1 (14) Base of abdomen without a hair fringe. 



2 (9) Mesonotum with two distinct parapsidal furrows; antennaa 



without a clearly denned club. 



3 (6) Parapsidal furrows strongly converging on the scutellum. 



4 (5) Radial cellule open on the fore margin. *Diglypliosema. 



5 (4) Radial cellule closed on the fore margin. -fGronotoma. 



6 (3) Parapsidal furrows almost parallel, widely separated from 



one another at the scutellum. 



7 (8) Radial cellule open on fore margin. $Disorgyma. 



* Type D. Eupatorii, Foer. f Type G. sculpurata, Foer. 



J Type D. divulgata, Foer. 

 VOL. 111. 13 



