460 THE INSECTA. § 353. 
With the Hymenoptera,” the testicles present many different forms. 
Beside 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 ejaculatorius.™ 
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, Blattidae and Mantidae, they are composed of long fasciculated or 
imbrieated 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. 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 
Suckow, Anat. u. physiol. Untersuch. Taf. IV. 
(Gastropacha pini).* 
WL. Dufour (Recherch. sur les Orthopt. p. 
399, PI. V.-X.) has furnished observations accom- 
panied with very many figures onthe male organs 
of the Hymenoptera. 
18 The testicles are simple with Parnopes, Cy- 
nips, Diplolepis and Chelonus. 
19 There are two unicapsular testicular bundles 
with Apis, Xylocopa and Bombus; see L. Du- 
four, loc. cit. fig. 53-62. The two testicular fasci- 
culi are enclosed in a common capsule with dn- 
thophora, Anthidium, Odynerus, Tiphia, Scolia, 
Pompilus and Crabro ; see L. Dufour, loc. cit. 
Pl. VI.-[X. 
20 L. Dufour, loc. cit. fig. 150-154 (Tenthredo, 
Hylotoma and Cephus). 
21 The deferent canals terminate each with a 
seminal vesicle with Cynips, Chelonus, Apis and 
Xylocopa. 
+2 See Brandt and Ratzeburg, Mediz. Zool. Taf. 
XXV. fig. 35 (Apis), and L. Dufour, loc. cit. 
* [ § 353, note 16.] See, also, for histological de- 
tails on the internal male organs and their develop- 
ment, of the Lepidoptera, Meyer, loc. cit. Siebold 
and Kélliker’s Zeitsch. I. 1849, p. 182. The for- 
mula of the devel of the is, of 
c.urse, the same as that of the development of the 
23 See L. Dufour, Recherch. sur les Orthopt. Pl. 
I.-V. There are two distinct fasciculate testicles 
with Gryllotalpa, Oecanthus, Ephippigera, and 
two groups of long, imbricated follicles with Tetrix. 
Locusta and Decticus. The testicles are fused 
into one body with Oedipoda and Blatta.t 
24 See Suckow, in Heusinger’s Zeitsch. II. 
Taf. XII. fig. 25, Taf. X. fig. 8; Rathké, De Li- 
bellur. partibus genital. Tab. 1. fig. 3, and L. Du- 
Sour, loc. cit. Pl. II. fig. 164, and Pl. XII. fig. 204 
(Perla and Libellula). 
25 See L. Dufour, loc. cit. fig. 25, 36 (Gryllo- 
talpa and Ephippigera). 
246 The Perlidae have only two testicular follicles 
inserted on the deferent canals. Tetrix, the 
Acrididae, Achetidae and Blattidae, have two long 
and large fasciculi ; finally, with the Mantidae and 
Locustidae, there are, besides these fasciculi, one or 
two pairs of shorter bundles ; see L. Dufour, loc. 
cit. Pl. IIL.-¥. 
ovaries ; but this observer shows that the spermatic 
particles are formed, like the ova, while the insect 
is in the pupa-state. — Ep. 
t (§ 353, note 23.] See also Leidy, Proceed. 
Acad. Sc, Philad. 1846, ILI. p. 80 (Spectrum 
JSemoratum).— Eb. 
