NEMATODE GENUS PHYSALOPTERA. 



1059 



slightly shorter, and about three times as broad as the vagina. 

 The common trunk is aboiit 1"1 mm, long and 75 /* thick ; its 

 posterior end divides twice, in the same way as seen in Ph. 

 ahbreviata, to give rise to the four uteri. 



The eggs are small, oval, and thick-shelled, measuring on an 

 average 40 /a long by 26 /a broad ; when laid they are already 

 fiilly embryonated. 



Male. 



The males are much smaller than the females, and measure 

 from 20 to 25 mm. long, with a maximum breadth of "7 to "85 mm. 

 The body is attenuated in its anterior half, the jposterior half 

 being of uniform thickness. 



The bursa is pointed and recurved ventralwards. The four pairs 

 of pedunculated papillse are equidistant, three pairs being j)re- 

 anal. The three pre-anal ventral papillfe are small, and are 



Text-figure 31. 



Fhysaloptera magnipapilla Mol. 

 A = Lateral view of lip. B = Caudal extremity of male. 



situated immediately in front of the anus. The first two pairs of 

 post-anal ventral papillae are also small and situated in a row in 

 close proximity to the anus. The 3rd pair is larger and slightly 

 obliquely placed ; they divide the tail roughly into the ratio of 

 1:3. The 4th and 5th pairs are small and approximated 

 to each other, and are situated just behind the middle of the 

 tail. The ventral surface of the bursa is ornamented with 

 longitudinal rows of tubercles. 



The spicules are straight, tubular, pointed, and slightly un- 

 equal ; the left is 450 [x long by 26 ya broad at its base, aiid the 

 right is 41 5 /x long by 20 /x, broad at its base. 



Host: Myrmecopliaga hivittata. Stomach. Brazil. 



Types in bottle 4457 in the Vienna Museum. 



My observations difi"er from those of von Drasche only in respect 

 to the teeth ; he states that the outer tooth is small, and in 

 his figure shows it smaller than the inner tooth. In the worms 



