ENTOMOPHTHOREAE OF THE UNITED STATES. 



Fig. 381. Secondary conidium of the second type. 



Figs. 382-391. Primary conidia. 



Empusa (Entomophthora) eonica, Nowaliowski, figs. 392-408. 



*Fig. 392. Conidiopliore originating from spherical hyphal body. 



Fig. 393. Cystidium. 



Figs. 394-402. Primary conidia. 



Figs. 403-404. Primary conidia produced in dryer situations. 



Fig. 405. Production of secondary conidium of the first type. 



Figs. 406-407. Secondary conidia of the second type. 



Fig. 408. Production of secondary conidium of the second type. 



*Fig. 409. Production of a zygospore by Spirogyra-Uke conjugation. 



Basidiobolus Ranarum, Eidam, flgs. 140-144. 

 Fig. 410. Conidiophore with conidium budding from its apex. 



Fig. 411. Conidium still connected with the basidium. 



Fig. 412. Tlie basidium (a) separated from the conidium. 



Figs. 413-414. Zygospores in diflerent stages of development with the " nabel" (a,a), persistent. 



Massospora eicadina, Peclc, flgs. 415-429. 



Figs. 415-417. Hyphal bodies. 



Figs. 418- 420. Production of spores from hyphal bodies. 



Figs. 421-423. Spores of the larger and smooth type. 



Figs. 424-428. Spores of the usual type. 



Fig. 429. One of the same spores seen in optical section, 



199 



Note.— The present investigation was carried on in the Cryptogaraic 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, . . - • 



Tlie genus Completoria, 

 The genus C'midiobolus, 

 The genus Basidiobolus, 

 The genus Empusa : 

 Infection and production of hyphal bodies. 

 Germination of the liyphal bodies and chla- 



mydospores, .... 

 Formation of conidiophores. 

 Formation and discharge of the conidia, 

 The conidia and their germination, . 



134 

 1.36 



136 

 137 

 137 

 13.8 



139 



141 

 142 

 143 

 144 



Secondary conidia, . . . 145 



Cystidia and rhizoids, . . . 146 



Formation of zygospores and azygospores, 146 



Hosts of Erapusae, . . . 150 



The habitat of Empusae, . . . 151 



Miscellaneous notes, .... 151 



Subgenera of Empusa, . . . 152 



Systematic enumenation of species : 



American species of Empusa, . . . 155 



European species of Empusa, . . 187 



Massospora ..... 190 



Basidiobolus .... 191 



List of papers consulted .... 192 



