190 
Cleobis) leading smoothly into the short upper 
margin, the lowest, foremost enå rather rounded, 
sowewhat shorter than the plumose setæ. 
In Cleobis Cubæ (Tab. IN, fig. 12) the lateral lobes 
are broad at the basis and longer than the short, 
dorsal lobe; the setal plate lower with the anterior 
margin rather concave below at the triangular apex; 
the plumose setæ reach far beyond the latter. 
In Rhax annulata? (Tab. II, fig. 13) the dorsal 
lobe is rather long, being, however, not as long as the 
uncommonly long but only middle broad lateral 
lobes; the setal plate has an equally and slightly con- 
cave anterior margin, but hardly any discernible excava- 
tion above the short, blunt, lower apex; the plumose 
sete reach a little in front of the apex. 
In Gluvia dorsalis Latr. rostrum is in all main 
points like rostrum in Cleobis, the broad lateral lobes 
are, however, comparatively a little longer. 
In Gluvia caucasica? (see above concerning the 
determination) we find a rostrum of quite a diffe- 
rent form. The dorsal lobe is long and stretches 
far beyond the middle-size lateral lobes; but 
the most remarkable is the setal plate, being a very 
long and narrow triangle with the dorsal 
line straight almost all the way, the apex is 
narrow and blunt, and far back on the lower side 
at the basis of the lateral lobes the plate 
projects in a small, triangular apex turning 
in an oblique direction both forwards and 
downwards, stretching alittle further than 
the lateral lobes and morphologically corre- 
sponding with the foremost, triangular apex 
in the other genera. The plumose set are but 
half the size of the interval between the apex of the 
lateral lobes and the setal plate. (It may once more be - 
