ENTOMOPHTHOREAE OF THE UNITED STATES. 197 



Pi-imai-y conidia from small gnat. 



Tlie same from Thrips sp. 



The same from a species of Musca. 



Tlie same from an ichneumon. 



Tlie same from CoUas philodice. 



The same from Phijtonomns larva. 



The same from rose leaf-hopper (Tijphlocyba) . 



A primary conidium producing a capillary conidiopliore on which is borne a mature secondary conidium 



of the second type. 

 The same. The secondary conidinm in process of formation. 

 A secondary spore of the second type unusually long. 

 A secondary conidium of the second type of the usual form. 

 Resting spores in process of formation from short hyphae, associated with a cross partition in each 



case. 

 Resting spore in process of formation from a single short hypha. 



Mature resting spores. 



PLATE 18. 

 Empusa (Entomophthora) Aphidis, figs. 220-240. 

 ijjrr. 220. Compound conidiopliore. 



^Fij 222! sfmple conidiophore : the protoplasm in the basidium has separated itself from the c-mpty hypha below 



by successive cross partitions. 

 Figs. 223-236. Primary conidia. 



Fis 237 Two secondary conidia of the second type. 



Fit'. 238. A primary conidium bearing a secondary conidium of the second type. 



*i7i^' 2<19 A hvphal body germinating in all directions. . „ „ 



f!:; 240. A primary spore germinating in water, the protoplasm separating itself by cross parffons from the empty 



hypha. 



Empusa (Entomophthora) dipterigena n. s., figs. 241-250. 

 Fi-s. 241-247. Primary conidia from a small fly, figs. 243 and 244 being characteristic of the species. 

 TTi" ' 248 Primary conidium bearing a secondary conidium. 



*Fi" 249'. Rhizoid with terminal expansion. The divisions of the expansion should be more truncate. 



Fi°. 250. A mature resting spore produced externally. 



Empusa (Entomophthora) virescens n. s., flgs. 251-201. 

 Fig. 251. Digitate conidiophore. 



fIJ' '''lea conidium which has been discharged without the rupture of the mother-cell wall which has merely 



stretched. 

 *Fig. 261. Hyphal body germinating in all directions. 



Empusa (Entomophthora) Americana n. s., figs. 262-273. 

 ♦Fi". 262. A group of rhizoids. 



""'f ■ lltlll: Two mltnre resting spores; fig. 272 showing separation of the inner and the two outer walls. 



Empusa (Entomophthora) montana n. s., flgs. 274-285. 

 *Fig. 274. A digitate conidiophore produced directly from a chiamydospore. 



♦Fi"- 275. Two cystidia. 



*Fi" 276. Terminal portion of a rhizoid showing its attachment to a b.t of Sphagmm. 



Fig! 277. Gross appearance of the fungus many times enlarged. 



Figs. 278-285. Conidia. 



PLATE 19. 

 Empusa (Entomophthora) echinospora «. s., figs. 286-305. 



Figs. 286-294. Conidia. 



Fi". 295. Terminal portion of a rhizoid. 



MEMOIRS BOSTON SOC. NAT. HIST., VOL. IV. 28 



