566 Journal of Agricultural Research voi. iv, no. 6 



base of the spear, where the duct enlarges to form a distinct, elongated 

 ampulla, emptying into the oesophageal lumen immediately behind the 

 base of the spear. From the somewhat broadly elevated but otherwise 

 not very conspicuous vulva the vagina leads inward at right angles to the 

 ventral surface fully halfway across the body, where it joins the two uteri, 

 one of which extends forward and the other backward. In the females 

 found infesting sugar-cane roots on the Island of Kauai, in Hawaii, the 

 thin-shelled eggs were observed to be about twice as long as the body is 

 wide and fully five-sixths as wide as the body. They begin segmenta- 

 tion before deposition. The blastomeres are rather coarsely granular. 



Male formula. ("=^18 2i6~^^2i8 ~Yl — "^Ji "''"'"■ The male 



differs in many important respects from the female, not only in the 

 form of the tail end but in that of the anterior extremity as well. The 

 neck of the male tapers rather regularly from the intestine forward, though 

 it decreases rather more rapidly in diameter anteriorly, where it ends in 

 a short, somewhat subcylindrical or hemispherical lip region set off by a 

 deep and distinct constriction. This lip region appears to be composed 

 of about the same number of striae as that of the female, and to have the 

 same general structure in spite of its difference in form and size. The 

 spear of the male, however, is very weakly developed and is nothing like 

 so efficient an organ as that of the female; in fact, at times it is difficult 

 to convince oneself that the male really possesses an oral spear. From 

 the structure of the mouth of the male it appears somewhat doubtful 

 whether he is able to make his way unaided into the tissues of the host 

 plant. It seems more probable that he works his wa)' into the cavities 

 already created by the voracity of the female. The bulbous base of the 

 spear is no wider than one of the nearby annules of the cuticle, and the 

 shaft at its widest part is considerably narrower than any of the annules 

 of the cuticle. It tapers anteriorly to an excessively, fine narrow point. 

 The wings of the male are similar to those of the female, but are hardly 

 so strongly developed (fig. 2). The tail tapers from some distance in 

 front of the anus and diminishes in size rather regularly to near the blunt 

 terminus. The posterior portion is subcylindroid and ends in a bluntly 

 conoid terminus, which is about half as wide as the base of the tail, and 

 which, like that of the female, is not provided with a spinneret. The 

 bursal flaps spring from the submedian lines at a point just in front of 

 the proximal ends of the spicula. When the body is seen in profile, the 

 bursa extends beyond the ventral contour from opposite the proximal 

 ends of the spicula to near the middle of the tail and continues almost to 

 the end of the tail. Near the junction of the middle and anterior thirds 

 of the tail there are two ventrally submedian, finger-shaped papillae, which 

 extend into the bursa and appear to reach about halfway to its margin. 

 The bursa, like the cuticle, is striated, and its margin is crenate. The 



