152 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 2 



of the esophagus 0.189 to 0.210 mm. in the male and 0.175 to 0.182 

 mm. in the female from the anterior end of the body. The excretory 

 pore is ventral. In the male the pore is located from 1.01 to 1.19 mm. 

 from the anterior end, and in the female it is located 0.86 to 0.99 mm. 

 from the anterior end. The esophagus is of the same muscular structure 

 throughout its length, except the anterior end which is cuticularized for 

 a short distance. The posterior end of the esophagus has a subspherical 

 bulb which averages 0.140 mm. in diameter in the males and 0.082 mm. 

 in the females. The esophageal bulb is equipped with valvular struc- 

 tures. The length of the esophagus, including the bulb, is from 1.21 to 

 1.35 mm. in the male and 0.70 to 0.79 in the female; the width of the 

 anterior portion of the esophagus is about 0.035 mm. The esophagus 

 in the male is about one third the body length, and one fourth the body 

 length in the female. 



The anterior end of the intestine is enlarged into a flask-shaped 

 region 0.187 mm. in the male and 0.129 mm. in the female in diameter. 

 The diameter of the intestine gradually diminishes from this point to 

 the mid-region where it continues uniformly to the posterior. 



Male: The posterior end of the body has a ventrally directed, 

 bluntly rounded tail, vaiying from 0.096 to 0.115 mm. in length. The 

 tail has wide alae which extend from the ventral body cleft to the 

 anterior of the distal fourth of the tail. The seminal vesicle has a length 

 of about 0.5 mm. and a width of about 0.15 mm. The acicular spicule 

 varies in length from 0.384 to 0.480 (average 0.437) mm. The acces- 

 sory piece is 0.048 mm. wide by 0.056 mm. long. It is straight and 

 widely V-shaped. 



Three pairs of genital papillae (figs. 26 and 27) are situated around 

 the cloaca at the ventral body cleft and on the ventral side of the tail. 

 One pair is precloacal and sessile, although situated on prominent projec- 

 tions from the body. The adcloacal papillae are on long peduncles. The 

 third pair of papillae is located at the anterior of the distal fourth of the 

 tail. These papillae are situated on prominent, stout peduncles. 



Female: The tail averages 0.49 mm. in length and is finely pointed. 

 The vulva ranges from 1.40 to 1.59 (average 1.44) mm. from the an- 

 terior end. None of the reproductive organs are fully developed. 



SPECIFIC DIAGNOSIS OF ALAEURIS CONOLOPHI 



Principal characters of genus. Medium-sized oxyurids; mature males 

 average 3.42 mm. in length by 0.23 mm. in width; immature females 



