i:nternal anatomy of the moth. 57 



latorius, and the penis. The testis is shaped like a very thick, nearly 

 spherical, button. (Plate VllI, Fig. 2, and X, Fig. 1, Te.) It is really a 

 compound organ composed of two testes fused together. The testes 

 can be found in the caterpillar as separate kidney shaped organs lying 

 close under the dorsal vessel* in the fifth abdominal segment. In both, 

 larva and imago the fiftli abdominal spiracle sends a branching tra- 

 cheal tree which spreads over and into the testes on each side. The 

 vasa deferentia lead from the posterior face of the testes. After a few 

 convolutions they dilate into i)od-shaped chambers, and then contract 

 for a length of very fine tubes until reaching the point of union with 

 the (jlandulcv mucoscc, into the basal portion of which the vasa deferen- 

 tia seem to open. A short distance farther and the two vasa deferen- 

 tia unite into a long, single duct, the ductus ejaculatorius, which is of 

 larger diameter, contracting slightly near its end, again dilating into a 

 very muscular, gourd-shaped section (Plate X, Fig. 1), which opens into 

 the penis. 



The latter organ is a slender, chitinous tube whose top projects be- 

 tween the claspers and below the anus, and which lies in the trough 

 formed by the ventral arch of the ninth segment, as already described. 

 It is protruded by a muscle on either side, the protractor penis, which is 

 attached to the ninth segment. The end of one of these protractors is 

 shown at pp in Figs, 1 and 2, of Plate X. The retractor was not found. 

 From the tip of the penis project two prongs, which bear on their inner 

 aspect several stout spines and some smaller teeth, as shown in Fig. 4, 

 Plate X. These prongs seem capable of protrusion and retraction, and 

 telescoped within the penis can be seen other chitinous processes and 

 spines, apparently of considerable complexity, which could not be sat- 

 isfactorily studied in the specimens at disposal. 



FEMALE organs OF REPRODUCTION. 



The ovaries consist of four long slender tubes, lying in several folds 

 on each side of the body. Their slender tips end in suspensory liga- 

 ments, all eight of which unite together immediately under the dorsal 

 vessel. At their basal ends the ovarian tubes of each side unite into 

 a uterine chamber (Plate IX, Fig. 4, iQ, the short oviducts from which 

 unite into a single oviduct, which passes through the eighth and ninth 

 segment and opens between the lateral flaps of the latter beneath the 

 anus. 



Two accessory glands — coUeterial or sebaceous glands, so called — 

 *which are concerned with secreting the egg-shell or the cement by which 

 the moth fixes the eggs in place when laid, open into the common ovi- 

 duct. The anterior gland is single; the posterior is a pair of glands 

 with a single duct. Both consist of long ccecal tubes, with pear-shaped 

 dilations near the base, followed by another roundish dilation. (See 



*See Meyer. Zeitschr. wiss. Zool. I, 182. Also H. Landois, ibid., xiii, 316. 



