§ 350. THE INSECTA. 451 



Mucous apparatus [Glaniulae sebaceae or colleteriae), for they secrete a 

 viscous, coagulable substance, which serves to envelop and glue the efr'm 

 together, and to fix them to foreign bodies. With the females of the 

 Ichneumonidae, this apparatus secretes a kind of cement with which these 

 insects close the wOunds they have made in the bodies of the Insecta in 

 which they have deposited their eggs. It is probable, also, that^with those 

 Insecta which deposit theii- 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. 



With the Hemiptera, the ovaries consist of four to eight tubes of variable 

 length, 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, and 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 CapsM^a 5e??imi5.'"'' Most Hemiptera have 

 no copulatory pouch, — the Cicadidae, alone, having one which consists 

 of a narrow-necked, pyriform vesicle.'" With the oviparous Aphididae, 



1 See Suiammerdamm, Bib. der Nat. p. 37, Taf. of the oviparous and viviparous Aphididae, in 



II. fi^. 8 {Pediculits), and Treviranus, Venn. FrorjR/j'sneue Notiz. XII. p. 308. 



Sshrift. II. 1). 15, T^if. III. fig. 8, 9 (Lepisma). 5 For the SL;miiiaI receptacle of the Pentatomidae, 



- S:!e L. Duf'our, Hecherch. sur Its Ilemipt. PI. see A. Dufour, Kecherch. &c. loc. cit. PI. XIV.- 



XIV.-XVII., iiud Ann. d. Sc. Nat. V. 1825, p. 168, XVL, and Sir.bold, in MuUer's Arch. 1837, p. 



PI. IV. (Cicada); and ShcIcow, in Heu.iini^er^s 410, Taf. XX. fig. 4-6.* 



Zeitsch. II. Taf. XV. &g. 55, 57 {Nepa and Cercopis). « See Meckel and L. Dufour, loc. cit. Accord- 



3 See Meckel, Beitr. &c. I. Hit. I. Taf. I. fig. 6, i. ing to Uoyire (loc. cit. p. 203, PI. VIII. fig. 3). 

 i.; L,. Dufour, Ann. d.Sc. Nat. V. 1825, PI. IV. fig. there is, witli the female Cicadidae, a special orifice 

 5, 1- 1-, and fi'j. 8, d. d. ; aaJ Dot/ere, Ibll. VII. by the side of the oviduct, which is continuous with 

 18^7, PI. Vlll. iig. 3-7, f. f (Lerfra and Cicada). the oviposit >r, and through which the penis pn>- 



4 &JJ my mfjuioir on the internal genital organs trudes int.) the ci4>ulatory pouch. 



* [ § 350, note 5.J For the female organs of Bzlostoma, see Leidy, log. cit. p. 61. — Ed. 



