SPECIES IN ARTHROPODA 



749 



Kudo (1922a, 1924a) has given the name T. opacita to a parasite of 

 larvse of Culex testaceus {C. apicalis) and C. territans, also of North America 

 (Fig. 320). The name was suggested by the effect the parasite has on its 

 host, which becomes of an opaque white colour. Its developmental 



Fig. 320. — Developmental Stages of Thelohania opacita (1-20, x 2,300, 

 21-23, X 2,360). (After Kudo, 1924.) 



1-3. Binary fission. 4-6. Multinucleate forms. 



7. Final binucleate product of multiplication. 

 8-10. Union of nuclei to form sporont. 

 U-Ki. Division of nuclei 1" U<vm ciulit. 17. Formation of eight sporoblasts 



18. l'ans|)ciioM,isl ((inf.iiiiiiiu ciiilit young spores. 



19. Pans|i(iiiil.l,i.st (■(iiitiiiiiiiiL.' •■iulit mature spores. 



•20. Panspdio blast with four si^ores. 21-23. Normal-sized spores. 



cycle is very similar to that of T. legeri. Reproduction is by repeated 

 binary fission. Finally, binucleate forms are produced. These, by fusion 

 of the nuclei, give rise to sporonts (pansporoblasts). The rounded 

 pansporoblast produces, as a rule, eight sporoblasts, which become spores. 



