460 THE INSECTA. •§> 353. 



With the Hymenoptera,'^'"' the testicles present many different forms. 

 IBeside two simple ovoid testicular follicles/^^' there are, not unfre- 

 quently, also two testicles composed of several long follicles, fasciculate, 

 and surrounded, 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^^^ 



With 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 beeu 

 observed. 



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

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

 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 follicles are united into a common mass on the median line of the 

 abdomen, by this Tunica vaginalisS-^ On the other hand, the Phasmidae, 

 Libelhdidae, 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 ejacidatorius, on which they are sometimes dis- 

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



Stickoir, Anat. u. physiol. Untersuch. Taf. IV. 23 See Z,. Di/./bur, Recherch. sur les Orthopt. PI. 



((Jastroprichd pint).* I.-V. There are two distinct fasciculate testicles 



li^ L. Dufour (Recherch. sur las Orthopt. p. with Gryllotalpa, OecantJiun, Ep/iippigera, and 



39'J, 1*1. V.-X.) lias furnished observations accom- two groups of long, imbricated follicles with Tetrix. 



jjiuiied with very many figures on the male organs Locusta and Decticus. The testicles are fused 



of the Ilymenoptcra. into one body with Oedipnda and BlattaA 



l!< The testicles are simple with Parnopes, Cy- 24 See Suckow, in Heusingcr''s Zeitsch. II. 



nips, Dip/o/cpis and Clielonus. Taf. XII. fig. 25, Taf. X. fig. 8 ; Ratliki, De Li- 



11) There are two unicapsular testicular bundles bellur. ])artibus genital. Tab. I. fig. 3, and L. Du- 



with Apis, Xylocopii and Bombus ; see L. Du- four, loc. cit. PI. II. fig. 164, and PI. XU. fig. 204 



four, loc. cit. fig. 5.J-62. The two testicular fasci- (Per/a and Liliillnla). 



culi are enclosed in a common capsule with An- 25 See />. Diijour, loc. cit. fig. 25, 36 {Gryllo- 



thophora, Ant/iidium, Odynerus, Viphia,Scolia, talpu and Kpliipjiigtra). 



J'ompiliis and Crabro ; see L. Dufour, loc. cit. -ü 'J'lie Perlidae have only two testicular follicles 



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



-■<* L. Dufour, loc. cit. fig. 150-154 {Tentkredo, Acrididae, Achetidae and Blattidae, have two long 



Hylotoma and Cephus). and large fasciculi ; finally, with the Mantidae and 



21 The deferent canals terminate each with a Locustidae, there arc, besides these fasciculi, one or 

 siniinal vesicle with Cynips, Clielonus, Apis and two ])airs of shoi-ter bundles ; see L. Dufour^ loc. 

 Xylocopa. cit. I'l. III.-V. 



22 See Brandt and Ratzeburs, Mediz. Zool. Taf. 

 XXV. fig. 35 (Apis), and L. Dufour, loc. cit. 



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



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



iiient, of the Lepidoptera, Meyer, loc. cit. Siebold is in the pupa-state. — Ed. 



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



inula of tlie development of the testicles is, of Acad. Sc. Philad. 1846, III. p. SO (Spectrum 



c urge, the same as that of the development of the femoratum). — Ud. 



