344 
ME. LUBBOCK OK THE OVA AKD PSEUDOVA OP IKSECTS. 
in which the germs of the eggs are contained. This form of ovary, if it did really exist, 
would be a type entirely aberrant from that of the Insecta generally. Buemeistee, 
however, adds, that “ egg is linked to egg by an exceedingly fine filament ; ” and Leon 
Dufoue* gives a very different description of the ovary in Ephemera. Each ovarv, he 
says, consists of a prodigious number of small egg-tubes inserted into the superior wall 
of a common calyx or uterus, as is the case in lAhellula. I have little doubt that this 
account is correct, and that in Stratiomys also the egg-tubes are in reality present, but 
have been overlooked. 
The number of egg-tubes is most constant in the Lepidoptera, almost all of which 
possess fourf. Pterophorus, however, is said to have only three ijl. 
The Heteroptera also vary but little in this respect. Hydrometra'\, Aradus^, and 
Gerris have four; Nepa and Manatra^ five; Eotonecta^ six or seven; Coreus^, Penta- 
t07na^, Alydus^, Scutellera^, Pyrrhocoris^, Lygceus^, Cimex^, Redumus^, Pelogoniis^, 
Corixa^, and Naucoris cimicoides^ seven; while Naucoris aptera has only five§. 
In the Homoptera, on the contrary, the number varies greatly. Schizoneura corni has 
only two; Aphis padi\\ three or four; Aphrophora spumaria^., eight; A. salicina^, fif- 
teen; Ledra^ and Porthesia^, ten to twelve; Psyllaf and Cercopis^, about thirty ; Oicadaf, 
from fifty to sixty; and Coccus an unlimited number. 
The egg-tubes are numerous in Locusta migmtoria%, Phasma gigas%, Gryllotalpa 
vulgaids^, Acheta domestica, the Mantodea%, and in most Orthoptera ; but in a small 
species of Locusta I found only six, and iheBlattw have eight**. (Edipoda** iiguttida 
has six or seven, and (E. ccerulescens** fourteen; Tetrix** subulata has twenty; (Ecan- 
eight to ten; and Ephippigera mspertina** thirty to forty. 
Among the Neuroptera the egg-tubes are extremely numerous in EphemeraAf* 
Perla'\'\, lAhellida striolata, JEschna cyanea, and the Libellulidce generally. There are 
also a good many in Sialis%%^ Limnephilus and Phryga7iea%%; and in one of the Lepto- 
ceridm I found over forty. Termes has thirty f ; in Panorpa comimmis I found ten, which 
is the number also in Myrmeleo'\’\‘ and Hemerohius^‘\ ; and the minute genus Psocus has 
only five. 
We are indebted to Stein ( 1 . c.) for an excellent work on the female generative organs 
of the Coleoptera. He found three egg-tubes only in one species, Lathridius porcatus ; 
four is also an uncommon number, but exists in Hister simiafus, Plafysoma frontale, 
Bromius truncatellus, Scydmcenus tarsatus, T^dphyllus hifasdatiis. In Engis humeralis 
and Trox sabulosus there are five ; six in Clivina arenana., Eotiophilus aquaticiis, Noferus 
crassicornis, in many Brachelytra, and in many Lamellicoms. Seven egg-tubes occur in 
* Eecherches sur les Orthopteres, Hymenopteres, et Keuropteres. Mem. de I’lnstitut, 1841, p. 582. 
•f Eeet and Leitckart, 1. e. J Burmeistek, Z. c. p. 186. 
§ Leox Dtjeotje, Sur ies Hemipteres, Mem. d. Sav. Etran. 1833. 
11 Leuckaet, Zur Kenntniss, &c. pp. 335, 342. ^ Bvemeisteb, 1. c. 
** Leon Dufoub, M4m. d. Sav. Etrangers, 1841. 
tf Leon Dufotjb, Mem. de ITnstitut, 1841. 
ft Buemeistee, 7. c. p. 185. 
