^ 350. THE INSECTA. 451 



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

 viscous, coagulable substance, which serves to envelop and glue the (io-^s 

 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 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 scjiarately 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 

 eeminal receptacle or copulatory pouch. 



W^itt 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 Oicadidae, 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 Apkididae;**' is a long, slightly flexuous caecum with the Naucor- 

 idae, an 1 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 

 seminalls, 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 soniiiis.^^'' Most Hemiptera have 

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

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



1 See Swammerdamm, Bib. der Nat. p. ST, Taf. of tlie oviparous and viviparous Aphididae, iu 

 II. fig. 8 (^Pediculus), and Treviraniis, Venu. Frorieji^s neue Nntiz. XII. p. 308. 



Schrift. II. p. 15, Taf. III. ti;^. 8, 9 {Lepisma)^ ■'< i'ur the seminal receptacle of the Pentatomidae, 



2 See L. Dufbur, Recherch. sur les llemipt. PI. see /y. Da/our, Ueeherch. &c. loc. cit. PI. XIV.— 

 XIV.-XVII., and Ann. d. Sc. Nat. V. 1825, p. 16S, XVI., and Siebotil, in MuUer's Arch. 1837, p. 

 PI. IV. {Cicada); and Suckow, in He u.iin seer's 410, Taf. XX. fig. -1-6.* 



Zeitsch.II.Taf. XV. fl;,'. 55,57(iVe/)a and Cercopia). U See Meckel and L. Dufour, loc. cit. Aocord- 



u SeeiV/ec/.-e/, Beitr. &c. I. Hrt. I.TU. I. fig. 6, i. 'mg to Dot/ire (I jc. cit. p. 203, PI. VIII. fig. 3). 



•i.; L. Diifoitr^ Ann. d. Sc. Nat. V. 1825, I'l. IV. fig. thei-e is, witli the female Cicadidae, a special orifice 



5, 1. 1., and fig. 8, d. d. ; and Doycre, Ilud. VII. by the side of the oviduct, which is continuous with. 



1837, PI. VIII. fig. 3-7, f. f (Le:lrai\.\v\ Cicada). the ovipositor, and through which the peuis pro- 



4 See my memoir on the internal genital organs trudes into the copulatory pouch. 



* [ 5 350, note 5.] For the female organs of Betostoma, see Leidy, loc. cit. p. 64. — Ed. 



