ENTOMOPHTHOREAE OF THE UNITED STATES. 197 



Primary conidia from small gnat, 



The same from Thrips sp. 



Tiie same from a species of Muaca. 



Tiie same from an iolineumon. 



Tlie same from Oolias philodice. 



Tlie same from Phytonomiis larva. 



The same from rose leaf-hopper {Ti/phlocyba) . 



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



of tlie second type. 

 The same. The secondary conidium in process of formation. 

 A secondary spore of the second type unusually long. 

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

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



case. 

 Res.ting spore in process of formation from a single short hypha. 

 Mature resting spores. 



PLATE 18. 

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

 *Fig. 220. Compound conidiophore. 



*rig. 221. Cystidium. 



Fig. 222. Simple conidiophore: the protoplasm in the basidium has separated itself from the empty hypha below 



by successive cross partitions. 

 Figs. 223-236. Primary conidia. 



Fig. 237. Twosecondaryconidiaof the second type. 



Fig. 238. A primary conidium beariag a secondary conidium of the second type. 



*Fig. 239. A liyphal body germinating in all directions. 



Fig. 240. A primary spore germinating iu water, the protoplasm separating itself by cross partitions from the empty 



hypha. 



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

 Figs. 241-347. Primary conidia from a small fly, flgs. 243 and 244 being characteristic of the species. 

 Fig. 248. Primary conidium bearing a secondary conidium. 



*Fig. 249. Rhizoid with terminal expansion. The divisions of the expansion should be more truncate. 



Fig. 250. A mature resting spore produced externally. 



Empusa (Entomophthora) virescens a. s., figs. 251-261. 

 Fig. 251. Digitate conidiophore. 



Figs. 252-259. Conidia. 

 Fig. 260. Conidium which has been discharged without the rupture of the mother-cell wall which has merely 



stretched. 

 ♦Fi". 261. Hyphal body germinating in all directions. 



Empusa (Entomophthora) Americana n. s.^ flgs. 262-273. 

 *Fig. 362. A group of rhixoids. 



Figs. .263-271. Conidia. 

 " 272-273. Two mature resting spores; fig. 272 showing separation of the inner and the two outer walls- 



Empusa (Entomophthora) montana n. s., flgs. 274-385. 

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



*F!g. 275. Two cystidia. 



*Fig. 276. Terminal portion of a rhizoid showing its attachment to a bit of Sphagnum. 



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



Figs. 278-285. Conidia. 



PLATE 19. 



Empusa (Entomophthora) echinospora n. s., flgs. 286-305. 

 Figs. 286-294. Conidia. 

 Fig. 295. Terminal portion of a rhizoid. 



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



