HEMIPTERA. 51*3 



The oesophagus is usually small and short, while the much 

 convoluted stomach is very long and subdivided, first into a 

 large, straight, glandular portion ; second, into the convoluted 

 smaller part, and third, in some Pentatomids and CureAdm 

 there is a third stomach "consisting of a very narrow, slightly 

 flexuous canal, on which are inserted two or four rows of 

 closely aggregated glandular tubes." (Siebold.) The Cicad" 

 idee, and most Heteropterous Ilemiptera, have very large lobu- 

 lated salivary glands, divided into tAvo unequal portions, and 

 often Avith long digitiform processes. 



In tlie aquatic species, i.e., the JVa n^ or idcB and Nep idm., 

 there juv two stigm;ita at the vw\ of the abdomen. In Nepa 

 md Kunatra the stigmata are situated at the base of a 

 long tube. There are four long urinarj^ tubes. The ovaries 

 are formed of from four to eight tubes arranged in a verti- 

 cillate manner about the end of the short oviduct. In the 

 Psyllidm and Cicadidce, however, they are composed, in 

 the first family, of from ten to thirty unilocular tubes, and in 

 the second, of from twenty to seventy bilocular tubes. The 

 receptacuhim semmis consists of one or two small caeca, and the 

 Cicadidoi are the only Hemiptera which have a copulatory 

 pouch, this consisting of a pyriform vesicle. "The viviparous 

 Aphidoe, differ from those Avhich are oviparous, in that their 

 eight ovarian tubes are multilocular and their oviducts entirely 

 without appendages, while with the second, or oviparous, tliese 

 eight tubes are nnilocular, and there is a seminal receptacle 

 and two sebaceous glands." (Siebold.) The testes vary 

 greatly in number and form, consisting of from one to five 

 tubuliform or rounded glands. 



The active larva? of the Ilemiptera, like those of the Orthop- 

 tera, resemble closely the imago, diftering mainly in possessing 

 the rudiments of wings, which are acquired after tlie second 

 moulting. Aftertwo changes of skin (tour in all) they assume 

 the pupa state, which ditfers mainly from that of the larva in 

 having larger wing-pads. While the development of the imago 

 ordinarily occupies the sunnner months, in the Aphides it 

 takes but a comparatively few days, but in the Seventeen-year 

 Locust as many years as its name indicates. An exception 

 J;o this mode of development is seen in the larva of the male 



