MICROSPORIDIA, HELICOSPORIDIA 321 



Perezia mesnili Paillot (Fig. \?>1 , k). In the cells of the silk 

 glands and Malpighian tubules of the larva of Pieris hrassicae. 

 The spore measures 3.4 microns by 1.5 to 2 microns. 



Genus Gurleya Doflein. Each sporont produces four sporo- 

 blasts and finally four spores. Rare. 



Gurleya richardi Cepede (Fig. \37,l,m). In Diaptomus castor. 

 The spore measures 4 to 6 microns long by 2.8 microns broad. 



Genus Thelohania Henneguy. Each sporont develops into 

 eight sporoblasts and ultimately into eight spores. The sporont 

 membrane may degenerate at different times during develop- 

 ment. Numerous species. 



Thelohania legeri Hesse (Fig. 138, a-f). In the fat bodies of 

 anopheline larvae. The spore measures 4 to 6 microns long by 3 

 to 4' microns broad. Widely distributed. Heavily infected larvae 

 die without metamorphosing into adults. 



Thelohania opacita Kudo (Figs. 135, c; 138, g, h). In the fat 

 bodies of larvae of culicine mosquitoes. The spore measures 5.5 

 to 6 microns by 3.5 to 4 microns. 



Genus Stempellia Leger and Hesse. Each sporont produces 

 1, 2, 4, or 8 sporoblasts and in turn 1, 2, 4, or 8 spores. Two 

 species. 



Stempellia magna Kudo (Figs. 135,/, g; 136; 138, k-o). In 

 the fat bodies of various Culex larvae. The spore measures 12.5 

 to 16.5 microns long by 4 to 5 microns broad. The polar cap- 

 sule is visible in vivo. The filament when extruded under 

 mechanical pressure, reaches a length of 350 to 400 microns. 



Genus Duboscqia Perez. Each sporont produces 16 sporo- 

 blasts and later 16 spores. Only one species. 



Duboscqia legeri Perez. In the body cavity of Termes luci- 

 fugus. The spore measures 5 microns by 2.5 microns. 



Genus Plistophora Gurley. Each sporont develops into 

 many (more than 16) sporoblasts, each of which becomes a 

 spore. Several species. 



Plistophora simulii (Lutz and Splendore). In various 

 species of Simulium larvae. The spore measures 4.5 to 8 microns 

 long by 3 to 5 microns. 



Plistophora longifilis Schuberg (Fig. 135, e; 138, p, q). In 

 the testis of Barhiis fluviatilis. The spore measures 3 microns 

 by 2 microns up to 12 microns by 6 microns. 



