ENTOMOI'IITIIORKAK OK THE UNlTKI) STATES. 



199 



Fig. 381. Secondary conidiuni of the second type. 

 Figs. 382-391. Primary conidia. 



*Fig. 392. 



Fig. 393. 



Figs. 394-402. 



Bigg. 403-104. 



Fig. 40:>. 



Pigs. 40G-407. 



Fig. 408. 

 *Fig. 409. 



Fig. 

 Fig. 

 Fig. 



410. 

 411. 

 412. 



Figs. 413-414. 



Figs. 415-417. 

 Figs. 418 420. 

 Figs. 421-423. 

 Figs. 424-428. 

 Fig. 429. 



Empusa (Entomophthora) conica, Nowakowski, fig*. 392-408. 

 Conidiophore originating from spherical liyphal t>ody. 

 Cystidlum. 

 Primary conidia. 



Primary conidia produced in dryer situations. 

 Production Of secondary conidlum of the first type. 

 Secondary conidia of the second type. 

 Production of secondary conidium of the second type. 

 Production of a zygospore by Spirogyra -like conjugation. 



Basidiobolus Ranarum, Eidam, figs. 140-144. 

 Conidiopliore with conidium budding from its apex. 

 Conidium still connected with the basidium. 

 Tile basidium («) separated from the conidium. 



Zygospores in different stages of development with the " nabel" (a, a), persistent. 

 Massospora cicadina, Peck, figs. 415-429. 



liyphal bodies. 



Production of spores from liyphal bodies. 

 Spores of the larger and smooth type. 

 Spores of the usual type. 



One of the same spores seen in optical section, 



Notk. — The present investigation was carried on in the Cryptogamic laboratory of Harvard University and was pre- 

 sented as a graduating thesis May 1, 1888. 



CONTENTS. 



Summary of Entomogenous plants, 

 Facultative parasites of insects, 

 Entomophthoreae : 



General characters, .... 

 The genus Completoria, 

 The genus Conidiobolus, 

 The genus Basidiobolus, 

 The genus Empusa : 



Infection and production of liyphal bodies, 

 Germination of the hyphal bodies and chla- 



mydospores, .... 

 Formation of conidiophores, 

 Formation and discharge of the conidia, 

 The conidia and their germination, 



134 

 136 



136 

 137 

 137 

 138 



139 



141 



142 

 143 

 144 



Secondary conidia, . , . 145 

 Cystidia and rhizoids, . . . 146 



Formation of zygospores and azygospores, 146 



Hosts of Empusae, . . . 150 

 The habitat of Empusae, . . .151 



Miscellaneous notes, .... 151 



Subgenera of Empusa, . . . 152 



Systematic enumeration of species : 



American species of Empusa, . . . 155 



European species of Empusa, . . 187 



Massospora ..... 190 



Basidiobolus .... 191 



List of papers consulted .... 192 



