GENUS DINEURA. 11 



been clearly settled ; it has, however, been suggested 

 that they are caused by the manner in which the wings 

 are folded in the pupa. 



The case of Dineura stilata shows, too, how species 

 apparently very similar may have had very different 

 origins. Supposing we did not know its real affinities 

 it would, as I have stated, be regarded as very closely 

 related to N. jugicola, Thorn, and N. xanthog aster, 

 and regarded as a Nematus, I certainly think that is 

 its proper position ; but I scarcely think that these 

 species may have been derived through descent from 

 stilata. Still there is every reason for believing that 

 Nematus has been derived from Dineura ; in fact, the 

 latter may even have given origin to the Selandriades, 

 for remove one of the recurrent nervures in the hind 

 wings of D. verna and most entomologists would 

 consider it to be a Blennocampa; similarly, if D. 

 despecta had only one or no median cellule in the hind 

 wings, and if the first transverse cubital nervure were 

 completely obliterated, I, for my part, would have no 

 hesitation (especially seeing that it is a leaf miner as a 

 larva) in considering its systematic position to be near 

 Fenusa. 



Synopsis of Species. 



1 (2) Head, antennae, thorax, and abdomen, for the greater part tes- 



taceous ; transverse basal nervure received in front of the 

 transverse costal. Virididorsata. 



2 (1) Head and thorax for the greater part black. 



3 (11) Transverse radial nervure not interstitial. 



4 (7) Length over 2? lines ; femora not black ; antennae brownish 



beneath ; cerci long ; transverse basal nervure interstitial. 



5 (6) Abdomen for the greater part testaceous above ; breast more or 



less yellow. Stilata. 



6 (5) Abdomen entirely black above. Testaceipes. 



7 (4) Length not over 2 lines ; femora more or less black. 



8 (9) Abdomen dull reddish at the sides and beneath. 



Selandriiformis. 



9 (8) Abdomen entirely black ; stigma fuscous, white at the base ; 



transverse basal nervure received beyond transverse costal. 



Simulans. 

 10 (9) Stigma testaceous ; transverse basal nervure interstitial. 



Despecta. 



