﻿OBSERVATIONS UPON FILARIA PHILIPPINENSIS. 



11 



Name. 



Central viscus. 



Posterior 

 V spot. 



Movement. 



Periodicity. 



Adult, 



F. phUippinensis 



A spiral tube 



Present; 



Lashing and 



None 



Not found. 



sp. nov. 



or cylinder. 



also a pa- 

 pilla. 



progressive. 







F. nocturna Man- 



Granular mass. 



Present 



Lashing 



Nocturnal _. 



F. bancrofti. 



son. 













F. diimta Man- 

 son. 



Absent 



do - - 



do _ 



Diurnal . . 



Not found. 









F. perstans Man- 



_ __do 



Absent __. 



Lashing and 



None - 



F. perstans. 



son. 







progressive. 







F. demarquayi 



(?) 



(?) 



Progressive 



do 



F. demarquayi. 



Manson. 













F. ozzardi Man- 



Absent 



Absent 



do 



do _-__ 



F. ozzardi. 



son. 













F. magalhaesi R. 

 Blanchard. 



do 



do _ 



(?) 



(?) 



F. magalhaesi. 









F. volvolus Leuc- 

 kart. 



do. 



. do 



(?) 



(?) 



F. volvolus. 







F. t a n a g u c h i i 



G ranular 



do 



Progressive 



None 



F. taniguchii. 



Tan. 



streak from 

 mouth to 

 tail. 











F. ? ( Tanaguchii) 



Absent 



_ __do___ 



Lashing 



(?) 

 (?) 



Not found. 



F. gigas Prout 



(?) 



(?) 



(?) 



Do. 



CONCLUSION. 



Briefly summarized, the history of the development of Filaria phUip- 

 pinensis within the mosquito, Culex fatigans WiecL, is as follows : In from 

 fourteen to fifteen days the development is complete and the filaria has 

 passed into the labium of the mosquito ; the sheath of the embryo is lost 

 in the stomach, and the worm then penetrates the stomach Avail and 

 reaches the muscles of the thorax where most of the developmental changes 

 occur ; during this period of time the filaria has increased in length from 

 0.32 millimeter to as much as 2.20 millimeters, and in breadth from 

 0.0065 to 0.02 millimeter; it has developed a well-marked intestinal 

 canal, divided into oesophagus and intestine, a well-defined anus and 

 three papillae which are situated at the end of the tail ; the mouth 

 appears to be simply a circular cavity having no distinct lips. Develop- 

 ment so far as the morphology of the worm indicates, appears to be 

 complete at about the eleventh day, the only changes occurring after 

 that being a lengthening and narrowing of the filaria, which enables it 

 to enter the labium of the mosquito. 



In concluding, we desire to express our appreciation of the assistance 

 given us by Mr. Charles S. Banks, entomologist of the Biological Labora- 

 tory, Bureau of Science, and Mr. Charles Martin, photographer of the 

 Bureau of Science. 



