460 THE INSECTA. § 353. 



With the Ilymenoptera/^''' the testicles present many different forms. 

 Beside two simple ovoid testicular follicles,'"** there are, not unfre- 

 quentlj, also two testicles composed of several long follicles, fa.-ciculate, 

 and suvrouuded, together with a portion of the torose deferent canal, by a 

 common envelope ; but, more commonly, these two testicles are contained in 

 a capsule situated on the median line of the body.''*'" 



With the Tenthredinidae and the Siricidae, the testicles are separate and 

 distinct, without capsules, and composed of round follicles disposed botry- 

 oidally.'-"' The two deferent canals are usually pretty long, and have, 

 sometimes, at their lower extremity, two vesicular dilatations which, con- 

 taining sperm, may be regarded as seminal vesicles/-^' The deferent 

 canals with the Hymenoptera have, usually, two pyriform accessory glands, 

 whose excretory ducts unite into a short Ductus ejaculatoriusS-'^ 



Wilh the winged Strepsiptera, there are two pyriform testicles provided 

 with very short deferent canals, which dilate above the Ductus ejaculato- 

 rius into two seminal vesicles ; but nowhere has an accessory gland been 

 observed. 



With the Orthoptera, the two testicles are nearly always composed of a 

 greater or less number of follicles. With the Acrididae, Locustidae, Achc- 

 tidae, Blattidae and Mantidae, they are composed of long fasciculated or 

 imbricated caeca, which, as with the Hymenoptera, are very often sur- 

 rounded by a common envelope. In some species the two groups of testic- 

 ular fblliules are united into a common mass on the median line of the 

 abdomen, by this Tunica vaginalis S-''^ On the other hand, the Phasmidae, 

 Libellulidae, Perlidae and Ephemeridae, have a multitude of round folli- 

 cles, disposed botryoidally around a long dilated portion of each of the 

 deferent canals.'-^' These last are usually very short, and with the Ache- 

 tidae and Locustidae, only, they are quite long, and spiral from beginning 

 to end.'-''' Many Orthoptera have highly-developed accessory glands sur- 

 rounding a short Ductus ejaculatorius, on which they are sometimes dis- 

 posed in successive groups.'-"' A part of this apparatus, in which are 



Svckoir, Ariat. u. physiol. Uiitersuch. Taf. IV. 23 See i. /)«/bur, Recherch. sur les Orthopt. PI. 



{Gar.trojxiclui pitd)." I.-V. There are two distinct fasciculate testicles 



1'' L. Diifour (Uechcrch. sur les Orthopt. p. with Gry/lotulpa, Occantliu.i, Ephippigera, and 



399, t'l. V.-X.) has lurnished observations acconi- two groups of long, imbricated follicles with 7'e<ri:r. 



jianied with very many figures on the male orgaus Locusta and Decticus. The testicles are fused 



of the Hymenoptera. into one body with Oedipoda and Blatta.i 



IS The testicles ai-e simple with Parnopes, Cy- -4 See Siickow, in Heusinaer's Zeitsch. II. 



nips, Dijilo/epis ami Cbetonus. Taf. XII. fig. 25, Taf. X. fig."8 ; Rathke, Ue Li- 



l-'Tliere are two uiiicapsular testicular bundles bellur. ])artibus genital. Tab. I. fig. 3, and L. Du- 



with Apis, Xylocopa and Bombiis ; see L. Vu- four, loc. cit. PI. II. fig. 16i, and PI. XII. fig. 204 



four, luc. cit. fig. 63-62. The two testicular fasci- (Per/a and Lihi'Uuln). 



culi are enclosed in a common capsule with A)i- -'> See L. Dufour, loc. cit. fig. 25, 36 {GryUo- 



thophora, Aiithidinm, Ody7terus, Tiphia, Scolia, talpa and Ephippigtra). 



Pompilus and Crabro ; see L. Dufour, loc. cit. -<> The Perlidae have only two testicular follicles 



PI. VI.-IX. inserted on the deferent canals. Tetrix, the 



iO L. Dufour, loc. cit. fig. 150-154 {Tcnthredo, Acrididae, Achetidae and Blattidae, have two long 



l/yfotoina and Ccphus). and large fasciculi ; finally, with the Mantidae and 



^1 The deferent canals terminate each with a Locustidae, there are, besides these fasciculi, one or 



Siininal vesicle with Cynips, Chelonus, Apis and two pairs of shorter bundles ; see L. Dufour, loc. 



Xylocopa. cit. PI. III.-V. 



-^ See Brandt and Ratzeburg, Mediz. Zool. Taf. 

 XXV. fig. 35 (Apis), andi. Dufour, loc. cit. 



* [ § 353, note 16.] See, also, for histological de- ovaries ; but this observer shows that the spermatic 



tails on the internal male organs and their develop- particles are formed, like the ova, while the insect 



ment, of the Lepidoptera, Meyer, loc. cit. Siebo/d is in the pupa-slate. — Ed. 



and KoUiker's Zeitsch. I. 1849, p. 182. The for- t [ § 353, note 23.] See also Leidy, Proceed, 



mula of the development of the testicles is, of Acad. Sc. Philad. 1846, III. p. 80 (JSpectru?n 



course, the same as that of the development of the fcmoratmn). — Ed. 



