INTERNAL ANATOMY OF INSECTS. 149 
extension*. Rifferschweils considers the ovaries as formed 
upon fwo primary types.—First, flagelliform ovaries, con- 
sisting of conical tubes equal in length, and inserted at 
the same place at the end of the primary branches as in 
the Lepidoptera, the Bee, &c. Secondly, racemose ovaries, 
consisting of short conical tubes, so proceeding from the 
primary branches as to render the ovary racemose or 
pinnated, as in certain Neuroptera, Coleoptera, and Di- 
ptera>: but perhaps their structure will be better un- 
derstood if they are divided into agglomerate ovaries 
and branching ovaries: in the first the egg-tubes form 
two bundles, in which the branches are not discernible, 
as in the Ephemera, the chameeleon-fly, and spiders‘; 
and in the second the branches are distinct, as in the 
Lepidoptera and the majority of insects. 
The number of branches varies in different genera and 
species. In Echinomyza grossa, alarge fly, there are only the 
two primary branches‘; in the common dung-beetle (Geo- 
trupes stercorarius) these appear divided at their apex into 
fingers®: in Scolia, a Hymenopterous genus, and the 
butterfly of the nettle, there are three secondary branches 
on each side‘: in many other Lepidoptera and the hum- 
ble-bee there are four; in the common louse there are 
five; in the rhinoceros-beetle and the cockchafer, szz' ; 
in the wasp seven*; eight in the cockroach! ; twelve in 
@ Marcel de Serres in Mem. du Mus. 1819. 109. 
> Rifferschw. ubi supr.23—. Pirate XXX. Fic. 12.a. Swamm. 
Bibl, Nat. t. xiii f.8.a,f, gh. © Ibid. i. 104. ¢. xv. f. 3. ii, 62. 
t. xii. f. 8. Treviran. Arachnid. t. iv. f. 32. 4 Reaum. iv. 391. 
© Posselt Anat. der Ins. t. 1. f. 28, 29. f N. Dict. d’ Hist. 
Nat. xxx. 387—. Swamm. wbi supr. ii. 23. t. xxxv. f. 3. 
& Ibid. 1. 203. b Prate XXII. Fie. 2. 
i Swamm. wbi supr. i. 151. Gaede Anat. der Ins. t. it. f. 3. 
* Swamm. 1. 203. ' Gaede 20. #.1. f. 9. 
