194 ROLAND THAXTER ON THE 



DESCRIPTIONS OF THE PLATES. 



*,* The following figures are, with the exception of those representing host insects, from camera drawings slightly reduced 

 by photography and done on stone from the negatives. Figures marked with an asterisk were magnified 230 diameters 

 approximately in the original drawings; and the remainder, with the exception of the host insects, were magnified 435 

 diameters approximately. 



PLATE 14. 



Empusa Muscae, figs. 1-9. 

 Group of conidiophores showing conidia in several stages of development. 

 Basidium after the discharge of the conidium. 

 Basidium bearing conidium before discharge. 

 Hyphal body germinating within the host. 



Conldial spores discharged upon a slide and surrounded by a mass of protoplasm from the basidium. 

 Secondary conidia of the second type (unlike the primary). 

 Secondary conidium of the second type before discharge from the primary conidium. 



Empusa Culicis, figs. 10-16. 

 Group of conidiophoi-es. 



Primary conidia two of which are surrounded by a mass of protoplasm, the two others (o o) being free. 

 Secondary conidium of the second type before discharge fi-om the primary couidium. 

 Secondary conidium of the second type. 

 Two chlamydospores formed within the host.' 

 A rhizoid formed by the adhesion of two filaments. 



Empusa Grylli, figs. 17-48. 

 *Fig. 17. Group of conidiophores of different ages which have separated themselves from the enipty hyphae left 



behind, by successive cross partitions. 

 Conidium before discharge from the basidium. 



Upper part of basidium after discharge of the conidium showing the columella as a rounded prominence. 

 Primary conidium producing a secondary conidium of the usual type. 

 Conidia from grasshopper (Acridian). 

 Conidia from hairy caterpillar (Arctian). 

 Conidia from wood cricket (Ceuthophilus). 



Successive stages in the formation of resting spores by a possibly sexual process: 

 Variations in the process of forming resting spores by the method figured in figs. 31-35. 

 Production of a terminal resting spore asexually from a culture of chlamydospores taken from a caterpillar 



and made to develop in water upon a slide. 

 A resting spore of irregular shape formed by incomplete budding from a hypha. 

 A resting spore produced within a hyphal body. 

 A resting spore in process of budding from a hyphal body. 

 A mature resting spore. 

 Two septate hyphae taken from the femur of an Acridian, showing a point of anastomosis and numerous 



small outgrowths together with the lateral production of a resting spore. 

 A chlamydospore germinating. 



A resting spore rendered double by the imperfect union of the two divisions of a hyphal body. 

 An Acridian attacked by E. Gin/lli, after remaining a few hours in a moist chamber. 



PLATE 15. 

 Empusa Tenthredinis, figs. 49-65. 

 Fig. 49. Secondary conidium in process of formation from a primary spore. 



Figs. 50-55. Primary conidia from a species of Tenthredo. 



Empusa conglomerata? figs. 56-62. 

 Figs. 56-59. Primary conidia from larvse of Tipula sp. 

 Figs. 60-61. nesting spores in process of formation by budding from hyphal bodies nearly spherical in shape, from 



the same host. 

 Fig. 62. Mature resting spore. 



