146 KANSAS UNIVERSITY QUARTERLY: 
and the most conspicuous of those are, ‘‘dass bei Ceria arietis die 
rste und 2te Liangeader einander viel niher liegen und viel paral- 
leler laufen, als bei Certa signifera.” 
Finally I will state, that I have used the genus Cerza in the sense 
of Loew in the ‘‘Neue Beitrage I.” Bigot’s (Ann. Soc. Ent. de 
France, 1883) separation of the genus into two distinct genera I con- 
sider hastily done. Though Ceréa Fabr. (1794) is preoccupied by 
Ceria Scop. (1763), which is Scatopse Geoffr. (1764), I have hesi- 
tated to substitute for the familiar Fabrician genus that of the 
“‘unglticklich gebildeten” (Loew, Neue Beitrage, I, p. 5) Sphzxz- 
morpha Rondani. I believe, however, that Williston’s view (Man- 
ual N. Am. Dipt., 1896) will be generally accepted. See Osten 
Sacken ‘‘Prioritat oder Continuitét” (Wien Ent. Zeit. I (1882). 
Heft. 8.) and Bergroth ‘‘Zur Nomenclatur der Dipteren” (Ent. 
Nachr. Jahrg. XIII (1887), No. 10). 
