400 THE INSECTA. § 353. 



With the ITj'menoptera,^^' the testicles present many different forms. 

 Beside two simnle ovoid testicular follicles/'** there are, not unfre- 

 ([aently, also two testicles composed of several long follicles, fasciculate, 

 mid suirouuded, together with a portion of the torose deferent canal, by a 

 common envelope ; but, more commonly, these two testicles are containecl 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 accessoi-y 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 been 

 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, Bhittidae 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 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 Dicctus ejacidatorius, on which they are sometimes dis- 

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



Suckow, Aiiat. u. physiol. Untersuch. Tuf. IV. 23 gee Zy. Crt/oM?-, Recherch. sur les Orthopt. PI. 



{(iastropacha pini).'' I.-V. There are two distinct fasciculate testicles 



li^ L. Dufour (Kecherch. sur les Orthopt. p. with Gryl/,otalpa, Oecanthua, Epinppigera, and 



399, i'l. V.-X.) has furnished ohservations accom- two groups of long, imbricated folUcles witli Te/ria:. 



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



of the Hymenoptera. into one body with Oedipoda and BlattaA 



lt> The testicles are simple with Parnopes, Cy- 24 See Suckow, in HeusingerK^ Zeitsch. II. 



nips, Dip/olepis and Ckelonus. Taf. XII. fig. 25, Taf. X. tig. 8 ; Rathki, De Li- 



I'J There are tv70 unicapsular testicular bundles bellur. partibus genital. Tab. I. fig. 3, and L. Du- 



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



four, loc. cit. fig. 53-62. The two testicular fasci- \Perla and Libellula). 



culi are enclosed in a common capsule with An- 25 See L. Dufour, loc. cit. fig. 25, 36 (firyllo- 



thophora, Antkidium, Odynerus, Tipliia, Scolia, talpa and Ephippigtra). 



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



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



20 L. Dufour, loc. cit. fig. 150-154 (Tentiiredo, 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 are, besides tliese fasciculi, one or 

 SL-minal vesicle with Cynips, Ckelonus, Apis and two pairs of shorter bundles ; see L. Dufour, loc. 

 Xylocopa. cit. P). III.-V. 



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

 XXV. fig. 35 (Apis), and L. 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. Siebold is in the pupa-state. — Ed. 



and Kolliker's Zeitsch. I. 1840, p. 182. The for- f [ § 353, note 23.] See also Leidy, Proceed, 



mula of the development of the testicles is, of Acad. Sc. Philad. 1846, III. p. 80 {Spectrum 



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



