ENTOMOPHTHOKEAE OF THE UNITED STATES. 



199 



Fig. 381. Secondary conidium of the second type. 



Figs. 382-391. Primary conidia. 



Empusa (Entomoplitliora) conica, Nowaliowski, figs. 392-408. 



*Pig. 392. Conidlopliore originating from splierical liyplial body. 



Fig. 393. Cystldium. 



Figs. 394-402. Primary conidia. 



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



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



Figs. 406-407. Secondary conidia of tlie second type. * 



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



*Fig. 409. Production of a zygospore by Spirogyra-\i^e conjugation. 



Basidiobolus Kanarum, Eidam, figs. 140-144. 



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



Fig. 411. Conidium still connected with the basidium. 



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



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



Massospora cicadina, Peclc, figs. 416-429. 



Figs. 416-417. 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, 



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

 sented as a graduating thesis May 1, 1888. 



CONTENTS. 



Summary of Entomogenous plants, . . 134 



Facultative parasites of insects, . 136 

 Entomophthoreae : 



General characters, .... 136 



The genus Completoria, . - 137 



The genus Gonidiobolus, . . . 137 



The genus Basidiobolus, . . . 138 

 The genus Empusa : 



Infection and production of hyphal bodies, 139 

 Germination of the hyphal bodies and chla- 



mydospores, .... 141 



Formation of conidiophores, . . 142 



Formation and discharge of the conidia, 143 



The conidia and their germination, . . 144 



Secondary conidia, 



Cystidia and rhizoids. 



Formation of zygospores and azygospores, 



Hosts of Empusae, 



The habitat of Empusae, 



Miscellaneous notes. 



Subgenera of Empusa, 

 Systematic enumeration of species : 

 American species of Empusa, 

 European species of Empusa, 



Massospora .... 



Basidiobolus .... 



List of papers consulted 



146 

 146 

 146 

 150 

 151 

 151 

 152 



155 

 187 

 190 

 191 

 192 



