186 
Its enormous ovipositor exceeds anything that.I have seen 
at these small insects. Förster writes: „langen und star- 
ken Legebohrer“, „der fast die ganze Körperlänge erreicht“; 
these words I consider will have reference to the whole 
ovipositor and not to the part protruding from the apex 
of abdomen. The name therefore in my opinion ought 
to be altered and I propose to name it Centrobia Silvestrii 
after its discoverer. 
To Silvestri’s other species Centrobia similis | have 
nothing to remark. 
The Genus Centrobia thus embodies 4 European spe- 
cies and one variety which may be distinguished by the 
following characters: 
1." Stigma absent Sea Hr ae C. Försteri Kryger. 
Stigma present)... sa Ze ee Re ae epee BE EEREE 2; 
2. The visible part of ovipositor beyond apex of abdomen longer 
than half-the length of the’body-2 22.2.2 2 SS KE ee 3: 
The visible part of ovipositor beyond apex of abdomen 
shorter’ than’ half the. length ofthe: body. 23 RE ae 4. 
3. The visible part of ovipositor almost equal to the total length 
of the body; the whole ovipositor 14 times the length of the 
DOGY (0 2. un vee ee ele Se nO ere 
The visible part of ovipositor almost 2 of the whole length of 
the body; the whole ovipositor slightly longer than the length 
ofthe ‘body u. sane C. Silvestrii. var. minor Silv. 
4. The visible part of ovipositor more than 1 of the whole length 
of the body; the whole ovipositor a little shorter than the 
BOL un... eMule henna ta oe C. similis Silv. 
The visible part of ovipositor equal 2 of the total length of 
the body; the whole ovipositor a little longer than the body 
C. Walkeri Förster. 
1. C. Försteri Kryger. 
1918 Centrobia Försteri Kryger. Entom. Meddel. XII, p. 291. 
Description and drawings see Kryger |. c. 
2. C. Silvestrii nom. nov. 
1918 Centrobia Walkeri Silvestri Boll. Lab. Zool. gen. agrar. Sc. Agric. 
Portici XII, p. 249. 
Female chestnutbrown, the upper part of the head, 
