— 1()1 - 
The i|U('sti()n <il' the developiiHMit. oF tli(^ final markings in tim 
full-grown iepicioptorous larvao from the elements of typical longitiuJi- 
nal lines is, as far as I know, in a very unsatisfactoiy condition. The 
homologies between the larval markings in different groups of the 
order is almost (luite iinestal)lished. 
My observations on the development of the ocellated spots 
through all the larval instars to the adult larvae of Dilephila nerii (in 
the year 1903 on the Soutliern Coast of the Crimea) and Pergesa por- 
cellus (in the year 1804 in Pskov) show that the d(!velopment of the 
„ocellus" in the first of these species is quite different from its for- 
mation in the another. 
The development of the ocellated spot in D. nerii may be summa- 
rized as follows. This spot is placed on the third, mefathoracic segment 
of the body, aboi'e the level of the lateral line, which takes no part in 
its formation ; the spot is formed i)y the dots of secondary transverse 
rows of dots and appears to be a result of spreading and fusion of two 
(more rarely three) of them ; the one of these dots belongs to the first 
vertical row running from the lateral (subdorsal after Meyrick, 
dorso-lateral after Rothschild and J о r d a n) line to the dorsal one; 
the second belongs to the horizontal series bordering the lateral lint> 
from above. The dark ring of the ocellus is formed of two (or three) 
fine rings which encircle these white dots. See diagrams 1—4 on p. 156. 
The development of the „ocellus" in the i)orcellus-\arva is л^егу 
different. We have in this species the ocelli placed on the fourth and 
fifth segments of the body (first and second abdominal), lying on the level 
of the lateral line, and formed hy the modified parts of this latter; 
these parts are isolated and bordered by the thickened and crescent- 
shaped ]iortions of the dark shade adjacent to the lateral line from 
above and Ьеіолѵ. The secondary transverse lines have no part in theii- 
formation. Thus the middle of the ocellus is a portion of the lateral 
line, its ring consisting of two crescents, fused together, of dark shades 
bordering the lateral line from below and above (diagrams 5 and 6). 
For details see Russian text. 
The term of the „ocellated spot" is a very vague one, and applied 
to the too heterogeneous structures. The homologies between so called 
„ocelli" cannot be traced even in the limits of a single structure, e. g. 
on the wing. 
My observations, exposed in this article, point out that even 
heticeen the nearest insect-forms (such as D- nerii and P. porcellus, mem- 
bers of the same family) there is no homology in the formation of ocel- 
nted spots- 
Are all the „ocellated spots" analogous in their functions ? In 
this respect we possess now nothing but the coarse anthropomorphic 
theories. 
PyccK. Энто.4. Обоур. 1904. № 4. (Августъі. 
