§ 350. THE INSECTA. 451 
Mucous apparatus (Glandulae sebaceae or colleteriae), for they secrete a 
viscous, coagulable substance, which serves to envelop and glue the eggs 
together, and to fix them to foreign bodies. With the females of the 
Ichneumonidae, this apparatus secretes a kind of cement with which thése 
insects close the wounds they have made in the bodies of the {nsecta in 
which they have deposited their eggs. It is probable, also, that, with those 
Insecta which deposit their eggs by means of an ovipositor in the tissues of 
plants, thereby producing galls, these same organs serve as a kind of 
Poison-apparatus causing this diseased formation of the vegetable paren- 
chyma. 
§ 350. 
The different parts of the female genital apparatus present, in the vari- 
ous orders and families, countless modifications as to number, form and 
disposition. The most important of these are the following : 
With the Aptera, the two ovaries consist each of only four to five tubes, 
which, with the Pediculidae, open, all, at the top of the corresponding 
oviduct; while with the Lepismidae, they are separately inserted on the 
side of the moderately long oviduct. In both of these families, there are two 
short varicose caeca, which enter laterally the lower end of the vagina, and 
are probably sebaceous or viscous organs.” There appears to be here no 
seminal receptacle or copulatory pouch. ; 
Witk the Hemiptera, the ovaries consist of four to eight tubes of variable 
fength, disposed verticillate at the extremity of the short oviducts. The 
Psyllidae and Cicadidae, alone, form an exception in this respect. With 
the first, the ovaries are composed of ten to thirty unilocular tubes, and 
‘with the second, twenty to seventy bilocular ones. These last, moreover, 
are distinguished by their oviducts being divided into several branches, on 
the extremity of each of which is a tuft of ovarian tubes.” Their Recep- 
taculum seminis consists of two small caeca. The other Hemiptera have 
only a single seminal receptacle, which is pyriform with the Psyllidae and 
oviparous Aphididae ;“ is a long, slightly flexuous caecum with the Naucor- 
idae, an] Nepidae; and a very long, somewhat flexuous caecum with the 
Hydrometridae. With many Capsidae, and other Geocorisae, also, it is a 
pretty long and flexuous caecum, while, with the Pentatomidae, the rather 
short Ductus seminalis terminates in a brownish, horny, pyriform Capsula 
seminalis, the constrictions and protuberances of which often present a 
peculiar appearance. Sometimes this tube is dilated into a second 
vesicle, at whose base is a horny tube containing a second tube which 
is a direct prolongation of the Capsula seminis.© Most Hemiptera have 
no copulatory pouch, — the Cicadidae, alone, having one which consists 
of a narrow-necked, pyriform, vesicle. © 
1 See Swammerdamm, Bib. der Nat. p. 37, Taf. 
Il. fig. 8 (Pediculus), and Treviranus, Verra. 
Schrift. II. p. 15, Taf. IIL. fig. 8, 9 (Lepisma). 
2 Sze L. Dufour, Recherch. sur les Hémipt. PI. 
XIV.-XVIL., and Ann. d. Sc. Nat. V. 1825, p. 168, 
Pl. IV. (Crcada) ; and Suckow, in Heusinger’s 
Zeitsch. II. Tat. XV. fig. 55,57 (Vepa and Cercopis). 
3 See Meckel, Beitr. &c. I. Hit. I. Taf. I. tig. 6, i. 
i; L. Dufour, Ann. d. Se. Nat. V. 1825, PL. IV. fig. 
5, 1. 1, and fig. 8, d. d.; aud Doyere, Toil. Vil. 
1837, Pl. VIIL. fig. 3-7, «. © (Ledraand Cicada). 
4 See my memoir on the internal genital orgaus 
With the oviparous Aphididae, 
of the oviparous and viviparous Aphididae, in 
Froriep’s neue Notiz. XIL. p. 308. 
5 For the seminal receptacle of the Pentatomidae, 
see J,. Dufour, Recherch. &c. loc. cit. Pl. XIV.- 
XVI, and Siebold, in Mudler’s Arch. 1837, p. 
410, Taf. XX. fig. 4-6.* 
& See Meckel and L. Dufour, loc. cit. Accord- 
ing to Doyere (loc. cit. p. 203, Pl. VIII. fig. 3), 
there is, with the female Cicadidae, a special orifice 
by the side of the oviduct, which is continuous with 
the ovipositor, and through which the peris pro- 
trudes into the copulatory pouch. 
* [§ 850, note &.] For the female organs of Belostoma, see Leidy, loc. cit. p. 64. — Ep. 
