§ 353. THE INSECTA 459 



manner.^"' Sometimes these seven tubes are giouped into a bundle at the 

 upper extremity of each of the two deferent canals.*^' With tlie Cicadidae, 

 tlie testicuhxr 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 ejaculatorms is then dilated at its base into a kind of vesicle 

 divided into two or three lobes, which serve probably as mucous reser- 



voirs. 



C'J) 



With the Diptera, the male organs are much more simple, there never 

 being but two simple testicles,*^"' whose external envelope is often browner 

 yellow. These organs are usually pyriform or oval, but sometimes long 

 or hooked or twisted in various ways.'^^* The Vasa 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 

 glands. 



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.'^^^^ 



3 Coreus, Alydus, Pi/rrhocoris, Acanthia. 10 The male organs of the Diptera have been de- 



4 Capsuft, Miris. Aradus. scribed by L. Dufoiir (Ann. d. Sc. Nat. I. 1844, 



5 Z/.i;»/oitr, Ann. d. So. Nat. V. 182ö,Pl. VI. fig. p. 250), and by Loew (Horae Anat. p. 9, Tab. 

 6, 7, and in his Recherch. sur les Il^mipt. PI. XIII. I.-III.), whose account is very detailed and exact. 

 £g. 152-155 (Cicada, Aphrophora, and Issus). 11 The testicles are long and regularly flexuous 



6 With Aphis lonicerae, the six testicular tubes with Mi/opa, sjjiral-form with Asilus and Dasy- 

 are concentrated on the median line of the abdom- pogon, while those of the Hippoboscidae are ex- 

 inal cavity, so that they might easily be taken for a tremely long and very torose ; see L. Dufour, 

 single body ; see my observations in Froriep^s Ann. d. Sc. Nat. loc. cit. 



neue Notiz. XII. p. 307. According to Morren^s 1- Stratiomys, alone, has very long and torose 



description (Ann. d. Sc. Nat. 1836, p. 87, PI. VI.), deferent canals. 



there would appear to be a real fusion of the testi- 13 These two glands are very long with Hippo- 



cular tubes with Aphis persicae. hosca, Dolichopus, Asilus, and Stratiomys ; ra- 



^ yVith Aradrus, Nepa, Cicada, Aphrophora, the mose with Trypeta and Psila ; with Leptis, they 

 two simple glandular appendages, which are extra- are wanting, being replaced, probably, by two swell- 

 ordinarily long and flexuous with the Cicadidae, are ings situated at the lower extremity of the two def- 

 inserted on the sides of the deferent canals ; while erent canals. Empis and Scatopse have two pairs 

 ■with Aphis, which has two, and with Notonecta, of glands, one above, the other below. 

 Miris and Capsus, which have four, the glandular H The testicles are carmen-red with Ar/rynnis, 

 tubes open into the Ductus ejaculatorius, con- Uipparchia, Pontia and Liparis ; green with 

 jointly with the deferent canals. Lycaena and Sphinx. 



S Psylla, Pyrrhocoris, Velia and. Gerris. L. 13 6'Mcio!« (fleiismg-er's Zeitsch. II. Taf. X. fig. 



Dufour (Recherch. &c.) unhesitatingly calls these 10) has found two separated testicles with Ypono- 



dilatations of the deferent canals Vesiculae sem- meuta. The fusion of these organs is complete 



inates. with the Papilionidae, Sphingidae, Bombycidae, &c. 



y L. Dufour (Recherch. &c. PI. X.) also regards Hj See Herold, Entwickelungsgesch. d. Schmet- 



this reservoir as a Fesicula seminalis. terl. Taf. IV. XXXII. {Pontia brassicae), and 



