Walter Ritchie 321 



The spiculum gastrale is an inverted Y-shaped piece of chitin and 

 lies on the ventral side of the median lobe. The anterior arm of the 

 spiculum gastraJe is bent towards the dorsal surface, while the two 

 posterior arms are somewhat hooked. 



For purposes of comparison the various names of the chiti 110113 parts 

 of the male reproductive organs, used by Sharp and other authors, are 

 brought together in the following table. 



The Female Reproductive Organs of Saperda carcharias. 



Fig. 19 shows the parts of the female reproductive organs dissected 

 out of a beetle ready to lay her eggs. 



There are two ovaries (Ov), one on each side of the abdomen. Each 

 ovary consists of twelve egg tubes, each of which has a terminal 

 chamber (0) with a filament (F) at its apex. 



The eggs (Eg) pass from the ovaries to the oviducts (Od) which unite 

 to form a common tube the uterus (U). Entering the posterior portion 

 of the uterus dorsally, we have the accessory gland (AG) and the recepta- 

 culum seminis (Rs) (spermatheca). 



The accessory gland, at its beginning, is composed of a series of 

 branched tubes each of which ends blindly. Later these branches unite 

 to form a single tube which at first is somewhat delicate. 



Further along its course, the duct of the accessory gland swells out 

 a little, finally thinning out again into a more delicate tube before it 

 enters the uterus. 



Just before the duct of the accessory gland swells out, the recepta- 

 culum seminis opens into it. The receptaculum seminis is a globular or 

 bulb-shaped, chitinous body and lies in a bend of the duct of the ac- 

 cessory gland. 



On each side of the uterus at its basal end is situated a chitinous 

 plate (PI). This plate, under the high power of the microscope (see 

 Fig. 20, 1), shows a ridge (n) running in a horizontal direction, dividing 

 the plate into two halves. 



Following the uterus (U) is the vagina (V), which bends forward 

 towards the ovipositor, into which it passes. 



