May, 1916] Homopterous Studies. Part II 317 



Reproductive System. (PL XXII, Figs. 35, 36). 



Female Organs — The paired ovaries (ov.), are normally 

 located in the third segment of the abdomen, but frequently 

 they occupy the greater portion of the abdominal cavity. 

 Each ovary consists of six ovarian tubes (o. t.) or tubules, 

 although this number is subject to some variation. Holmgren, 

 who has studied the female organs in some detail gives the num- 

 ber of ovarian tubules in a Thamnotettix as twelve or two 

 pairs of six each. Each ovarian tube (o. t.) is attached at a 

 common point to the suspensor (sus), which in turn is supported 

 by a tracheal branch in the dorsal region of the body. The length 

 of the ovarian tubule varies greatly, but it frequently exceeds 

 the abdomen; in many cases, as just before oviposition, the 

 abdomen will be greatly distended by the numbers of eggs 

 in the ovaries and on first examination it would seem that the 

 whole abdominal cavity was filled with ova. In some cases the 

 ovarian tubes may be pressed into the thoracic region, previous 

 to oviposition. All the ovarian tubes unite caudally in a 

 common oviduct (Ovd.) which is short and broad, although in 

 some forms e. g. Cicadula, it may be long. The oviduct is 

 frequently constricted before the opening of the receptaculum 

 seminorum (rec. sem.) which is a semi-circular structure, 

 lying to the side of the oviduct. The size of the receptaculum 

 seminorum varies and may be large or small. Beyond the 

 receptaculum seminorum the oviduct receives two pairs of 

 accessory glands (ag\ ag-), which are very long and extend 

 back into the abdomen. The vagina which is the terminal 

 portion of the oviduct, opens into the ovipositor, through 

 which the ova are extruded. 



Male Organs — (PI. XXII, Fig. 35). In the male each testis 

 is composed of a varying number (usually six) follicles (f.). The 

 testes which are located at the posterior end of the abdomen are 

 yellowish in color, and are frequently enclosed in a whitish 

 membrane. Each follicle is about three times as long as broad, 

 and opens into the vas deferens (v. d.) by a separate duct. 

 The vasa deferentia are about four times as long as broad 

 and unite to form the ejaculatory duct (e. d.), which is merely 

 a dilation before the penis or copulatory organ. Small accessory 

 glands (a. g.) enter the vasa deferentia just before the ejaculatory 

 duct. 



