196 ROLAND THAXTER ON THE 



Figs. 131-134. Showing this bud in several successive stages of development. 



Figs. 135-136. The bud has become the mother cell of a zygospore while the two hyphal bodies remain attached as 



bladders which contain certain fatty bodies. 

 Fig. 137. A mature zygospore lying free in Its mother cell, the walls having been separated through the absorption 



of water. 

 Fig. 138. A small zygospore to which the ragged remnants of the hyphal bodies are still attached as in the previous 



figure. 

 Figs. 139-140. Zygospores from which the remnants of the hyphal bodies have wholly disappeared, a remnant of the 



gametes still adhering to flg. 140. 



Empusa (Triplosporium) lageniformis n. s., figs. 141-160. 

 *Fig. 141. Young conidiophores of a digitate type seldom seen in this species. All the figures are from Aphides on 



white birch {B. popiilifolia). 

 *Fig. 142. Conidiophores of the usual type. 



Fig. 143. A primary conidium of the usual type germinating to produce a secondary conidium of the first type. 



Figs. 144-145. Hyphal bodies germinating to form conidiophores. 

 Figs. 146-154. Primary conidia. 

 Fig. 155. A primary conidium has produced a capillary conidlophore, the apex of which has begun to swell into a 



secondary conidium of the second type. 

 Figs. 156-157. Two primary conidia have produced capillary conidiophores upon which are borne mature secondary co- 

 nidia of the second type. 

 Figs. 158-160. Three secondary conidia of the second type in different stages of germination. 



PLATE 17. 

 Empusa (Entomophthora) Lampyridarum n. s., figs. lGl-172. 

 Conidiophores of a simple type. The type of the species is liowever probably compound. 

 Primary conidia. 



Secondary conidia of the second type. 



A secondary conidium of the second type has produced a capillary conldiophore the apex of which is be- 

 coming swollen into a tertiary conidium of the same type. 

 Two primary conidia bearing mature secondary conidia of the second type on capillary conidiophores. 

 Appearance of host, OhauUognathus Pensylvanicus, attacked by this species. 



Empusa (Entomophthora) geometralis n. s., figs. 173-178. 

 Eupithecia attached to a pine needle by haustoria before death. 

 Thera similarly attached showing position of conidiophores. 

 Group of primary conidia. 



Two primary conidia producing secondary conidia of the second type on capillary conidiophores. 

 Fig. 178. Two secondary conidia of the second type. 



Empusa (Entomophthora) occidentalis n. s., figs. 179-199. 

 Ehizoid with irregularly expanded extremity. 

 Digitate conidlophore. 

 Basidium and conidium before discharge. 

 Primary conidia with fat globules. 



Primary conidia of the usual appearance. Figs. 183 and 185 are more distinctive of the species. 

 Primary conidium which has germinated to produce a secondary conidium of the first type. 

 Primary conidium which has produced a capillary conidlophore on which Is borne a mature secondary 



conidium of the second type. 

 Primary conidium germinating as in the last figure: the secondary conidium being Immature. 

 Secondary conidium of the second type. 



Secondary conidium of the second type in process of germination. 

 Mature resting spore. 

 Formation of resting spores by a possible sexual process. 



Empusa (Entomophthora) sphaerosperma, figs. 200-219. 

 CoUas attacked by the fungus. 

 A small hymenopterous insect similarly attacked. 

 A compound conidiopliore. 



