$ 353. THE INSECTA 459 
manner. Sometimes these seven tubes are grouped into a bundle at the 
upper extremity of each of the two deferent canals.” | With the Cicadidae, 
the testicular tubes are extremely numerous and fasciculate in the same 
manner ; while with Psylla, there are only four, and with Aphis, only three 
on each side. The Hydrometridae have only two or four long testicular 
follicles, on the. sides of which arise the deferent canals. With Pelogonus, 
and Notonecta, there are two pairs of long, spiral tubes, while with Nepa, 
and Ranatra, there are five on each side, long and flexuous. The Vasa 
deferentia are short with most of the Geocorisae, the Psyllidae and the 
Aphididae; but with the Hydrocorisae, and the Cicadidae, they are long 
and intertwisted. The glandular appendages are highly developed with 
most Hemiptera and often open into the two deferent canals above the 
Ductus ejaculatorius.° But when these glands appear to be wanting, the 
deferent canals have upon their course, or at their extremity, vesicular dila- 
tations which, perhaps, take their place.© With the Pentatomidae, the 
glandular appendages consist of two to four multiramose fasciculate tubes. 
The Ductus ejaculatorius is then dilated at its base into a kind of vesicle 
divided into two or three lobes, which serve probably as mucous reser- 
voirs,) 
With the Diptera, the male organs are much more simple, there never 
being but two simple testicles,“ whose external envelope is often brown or 
yellow. These organs are usually pyriform or oval, but sometimes long 
or hooked or twisted in various ways.“) The Vusa deferentia are usually 
of considerable length,” and open in the upper end of the Ductus ejacu- 
latorius,™ always in common with two simple and pretty long accessory 
lands. 
: ‘With the Lepidoptera, the testicles are always composed of two round 
or oval follicles, often surrounded by a beautifully colored pigment.“ Very 
often, also, they are so approximated on the median line of the abdomen, 
as to appear fused into a single round body.°? The two deferent canals, 
after a short course, unite with two simple, long and very flexuous acces- 
sory glands, and then form a very long and torose Ductus ejacula- 
torius, 
8 Coreus, Alydus, Pyrrhocoris, Acanthia. 
4 Capsus, Miris, Aradus. 
5 L. Dufour, Ann. d. Sc. Nat. V. 1825,PI1. VI. fig. 
6, 7, and in his Recherch. sur les Hémipt. Pl. XIII. 
fig. 152-155 (Cicada, Aphrophora, and Issus). 
6 With Aphis lonicerae, the six testicular tubes 
are concentrated on the median line of the abdom- 
inal cavity, so that they might easily be taken for a 
single body; see my observations in Froriep’s 
neue Notiz. XII. p. 8307. According to Morren’s 
description (Ann. d. Sc. Nat. 1836, p. 87, Pl. VI.), 
there would appear to be a real fusion of the testi- 
cular tubes with Aphis persicae. 
7 With Aradrus, Nepa, Cicada, Aphrophora, the 
two simple glandular appendages, which are extra- 
ordinarily long and flexuous with the Cicadidae, are 
10 The male organs of the Diptera have been de- 
scribed by Z. Dufour (Ann. d. Sc. Nat. I. 1844, 
p. 250), and by Loew (Horae Anat. p. 9, Tab. 
I.-III.), whose account is very detailed and exact. 
11 The testicles are long and regularly flexuous 
with Myopa, spiral-form with Asi/us and Dasy- 
pogon, while those of the Hippoboscidae are ex- 
tremely long and very torose; see L. Dufour, 
Ann. d. Sc. Nat. loc. cit. ‘ 
12 Stratiomys, alone, has very long and torose 
deferent canals. 
18 These two glands are very long with Hippo- 
bosca, Dolichopus, Asilus, and Stratiomys ; ra- 
mose with T'rypeta and Psila; with Leptis, they 
are wanting, being replaced, probably, by two swell- 
ings si d at the lower extremity of the two def- 
inserted on the sides of the deferent canals; while 
with Aphis, which has two, and with Votonecta, 
Miris and Capsus, which have four, the glandular 
tubes open into the Ductus ejaculatorius, con- 
jointly with the deferent canals. 
8 Psylla, Pyrrhocoris, Velia and Gerris. L. 
Dufour (Recherch. &c.) unhesitatingly cails these 
dilatations of the deferent canals Vesiculae sem~ 
inates. 
9 L. Dufour (Recherch. &c. Pl. X.) also regards 
this reservoir as a Vesicula seminalis. 
erentcanals. Empis and Scatopse have two pairs 
of glands, one above, the other below. 
d4 The testicles are carmen-red with Argynnis, 
Hipparchia, Pontia and Liparis; green with 
Lycaena and Sphinz. 
15 Suckow (Heusinger’s Zeitsch. II. Taf. X. fig. 
10) has found two separated testicles with Ypono- 
meuta. The fusion of these organs is complete 
With the Papilionidae, Sphingidae, Bombycidae, &c. 
16 See Herold, Entwickelungsgesch. d. Schmet- 
terl. Taf. IV. XXXII. (Pontia brassicae), and 
