1076 



MR. R. J. ORTLEPP ON 'J'HE 



(29) Physaloptera dilatata Eudolpbi, 1819. (Text-fig. 41.) 



Syn. Spio'optera dilatata (Rud., 1819), Duj., 1845. 



Two males and two females were examined from bottle 4454 in 

 the Vienna Museum. The females were somewhat shrunken, but 

 otherwise the material was in an excellent condition. 



The cuticle is finely striated transversely, and is loosely attached 

 to the body ; it is reflected over the base of the lips. 



The cervical papillae are situated about 290 fx behind the level 

 of the posterior limit of the muscular oesophagus, and the excre- 

 tory pore about another 200 /x further back. ?3=|^ 



The two lips are large and semi-rectangular, with projecting 

 dorsal and ventral corners. Each is surmounted by a large 

 conical external tooth, and a tripartite inner tooth of the same 



Jext-figure 41. 



Fhysaloptera dilatata Rud. 

 A = Terminal portions of female genitalia. 

 B = Caudal extremity of male. 



height but semi-membranous. No additional teeth are present. 

 Externally each lip has a subdorsal and a subventral dome-like 

 papilla. 



The oesophagus is remarkable for its difference in relative 

 length in the two sexes; in the two male specimens examined it 

 formed respectively 1/4-.S and l/4'8 of the total body-length ; in 

 the females it is relatively only half this length, forming in 

 the one l/8'6 and in the other 1/7*5 of the total length. Its 

 muscular part is thinner than the following glandular, and 

 forms about 1/lOth of the whole organ ; it is encircled by the 

 nerve ring at the junction of its third and last quarters. 



Female. 



The females are large and stout, the two specimens measuring 



