194 ROLAND TIIAXTER ON THE 



DESCRIPTIONS OF THE PLATES. 



*,* Tlie following figures are, with tlie exception of those representing Iiost insects, from camera drawings slightly reduced 

 by photography and done on stone from the negatives. Figures marked witli an iisterisli 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 Museae, figs. 1-9. 

 Group of conidiophores showing conidia in several stages of development. 

 Basidium after the discharge of the conldiiini. 

 Basidiuin bearing conidium before discliarge. 

 Hyphal body germinating witliin tlie host. 



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

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

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



Empusa Culieis, figs. 10-16. 

 Group of conidiophores. 



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

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

 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 whicli have separated themselves from the empty hyphae left 



behind, by successive cross partitions. 

 Conidium before discharge from the liasidium. 



Upper part of b.isidium 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 cricliet {Ceulhopldlus). 



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

 Variations in tlie 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 sliape 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, sliowing a point of anastomosis and numerous 



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

 A chlainydospore germinating. 



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

 An Acridian attacked by E. Grylli, after remaining a few hours in a moist chamber. 



PLATE 15. 

 Empusa Tenthredinis, figs. 49-55. 

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



Figs. 50-55. Primary conidia from a species of 7c«(/i)e(to. 



Empusa conglomerata? figs. 56-62. 



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



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



the same host. 

 Fig. 62. Mature restiug spore. 



