346 
ME, LUBBOCK OK THE OVA AKD PSEUDOVA OF IKSECTS. 
already led to several misstatements in works on insect anatomy. There is, however. I 
believe, in every species, except perhaps when the egg-germs are very numerous.’ a 
certain normal number which are present in each egg-tube when the oldest, and there- 
fore the posterior egg-germ has attained to matuiity, and is ready to descend into the 
uterus. Still in most egg-tubes the egg-germs become so “small by degrees and 
gradually less, that it is difficult if not impossible to say exactly how many are present. 
Where, therefore, the exact number is not mentioned, it must not be 'infen-ed that 
the number varies, but only that it was not more accurately determined. Probably, 
however, when the number is considerable, it admits of certain variations, even in the 
same species. 
In the Lepidoptera the egg-germs are very numerous, varying from twelve to more 
than a hundred. In the Orthoptera they are rather fewer. Buemeistek*, indeed, 
ascribes only three to Gryllus migratorius, and six to BlaUa-, but in B. orientaUs 
I found rather more than twenty. Pie does not mention to what species he aUudes. 
but there is seldom much variation in this respect in species of the same genus, so that 
probably he examined a young specimen in which only a few egg-gei-ms had as vet 
been produced. 
In the Hymenoptera the eggs are rather less numerous in each egg-tube. Chrysis 
and Xylocojya are said to have only three; Bombus terrestris^ only six (but this again 
I doubt, as in B. musconmi I have found in July from twelve to fifteen); in Cynips 
ligmcola there are thkteen; Agns mellificaX has seventeen, and in some Ichieumonidce 
they are still more numerous. 
In Pulex irntans I found fourteen egg-germs occupying the whole uidth of the effs- 
tube, and a large number which had not yet arrived at that stage. 
Among the Neuroptera the number of egg-germs in each egg-tube is nearly the same 
as in the Hymenoptera. In ^schna there are about fifteen ; in Ubellida stndata about 
the same number ; in Panorpa about twelve ; in Chryscxpa about ten ; in Psocus only five. 
The egg-development of the Coleoptera has been carefuUy described by SxEix, ffiom 
whose excellent work I have extracted many details concerning this order. He finds 
(/. c. p. 32) the greatest number of egg-chambers in the Curculionidce, where frequently 
as many as twenty are present. Thus, Brachyderes incanus has twenty-one, Hylobius 
dbwtis 8-11(1 Sito7i68 lifisdtus 6iglitG6n. 
In the Cyphomdw also the number is considerable; Cyphon ;puhescens has as many as 
teem In Teleplioms dispar he found seven or eight; in the Cicinddidw, Carabidcp, 
and Hydrocanthandm also, each tube has several egg-germs. In Colymbetes fuscus 
ere are twelve; the numhex in NotiopJiilus aquaticus, Carabus graoiulatus, Q.xidi Cidndda 
campestris is seven. 
The remaining families of this great order have less than five egg-germs in each tube, 
e egg-development in the Diptera has been little studied, and from the small size 
o the ovaries, and indeed of the generative organs generally, it presents great diffi- 
* -toe. cit. p. 187. t Ibid. + . 
