64 MAINE AGRICULTURAL EXPERIMENT STATION. ig02. 



near the outside. Those at the center are seven microns in 

 diameter, while those at the outside range from five to six microns 

 in diameter. 



The eyes are deeply colored with a dark brown pigment, which 

 makes them very conspicuous. The ocelli, three in number, are 

 placed between the compound eyes on the dorsal surface of the 

 head, and are arranged in the form of a triangle. The anterior 

 median ocellus is about seven microns in diameter and each pos- 

 terior ocellus is about ten microns in diameter. They are not 

 very conspicuous, as they have little pigment and are not raised 

 much above the surrounding parts. 



REPRODUCTIVE SYSTEM. 



Fig- 7- 



The reproductive apparatus of the female insect consists of 

 two ovaries, each of which is made up of five ovarian tubes. 

 Each ovarian tube is divided into three sections. First ; the ter- 

 minal thread, at the anterior end, by which that end of the ovary 

 is attached to the dorsal wall of the abdomen. These threads 

 all run together to form a single thread on each side. Second ; 

 the terminal chamber, which contains undifferentiated cell ele- 

 ments which give rise to the eggs. Third ; the actual ovarian 

 tubes, the chambered part of which contains the eggs. 



The ovarian tubes are long and slender and extend from the 

 fifth to the first abdominal somite. They contain no chambers 

 of nutritive matter. At the posterior end of the ovaries there is, 

 on each side, a very short oviduct, which soon unites with its 

 fellow to form the common oviduct, fig. 7, ovd. This extends 

 from the fifth to the junction between the sixth and seventh 

 abdominal somites, where it opens to the exterior at the base of 

 the ovipositor. There is no well marked receptaculum seminalis 

 or accessory sac. The walls of the ovaries are thin, and are made 

 up mostly of connective tissue. The walls of the oviduct are 

 much thicker and well supplied with muscle fibers. 



The largest eggs in the lower chambers are about .15 mm. in 

 length and .06 mm. in thickness. They are deeply concave on the 

 surface that is turned toward the median line of the body, and 

 are covered with a strong: membrane. 



