ENTOMOPIITIIOREAE OF THE UNITED STATES. 



L65 



has been filled with a coherent mass of empty, interlacing hyphae resembling the 

 w stroma" described by Sorokin and previously referred to. The conidiophores, w hich 

 are clear white, coalesce over the body to a greal extent, forming an envelope of consid- 

 erable thickness. They sometimes tend to become digitate, so that this species, together 

 with E. Culicis, forms a connecting link between the simple and compound types. 



The species occurs not uncommonly in North Carolina on the under side of leaves 

 in Rhododendron thickets; and I have found it occasionally in Maine near brooks or 

 marshy places in woods, always on leaves. The specimen on Hyphantria textor (larva) 

 was found at Burbank, E. Tenn., in one of the nests peculiar to these caterpillars; but, 

 all hough there were many in the nest, I found no additional specimens attacked by the 

 fungus. The omnivorous character of the species is noticeable, and experiments with 

 infections of different hosts are much to be desired, especially with aphides, since it is 

 only by this means that the true relations between this and the succeeding form can be 

 determined. 



Empusa Planchoniana (Cornu) ?. 

 PI. 15, figs. 76-78. 



Entomophthora Planc7ioniana, Cornu I. c. A, pp. 189, 190; I. c. B, foot-note, p. 4. Sor- 

 okin I c. C, p. 214. 



Conidia nearly spherical or broadly ovoid, with a papillate base which is sometimes 

 furnished with a short sharp point. Average measurements 28-33/^ X 30-40,u. Conid- 

 iophores simple, partially coalescing over the host. Secondary conidia like the primary. 

 Resting spores, azygospores, produced laterally or terminally, more commonly intersti- 

 tially, from hyphae ; spherical, or very irregular in the interstitial forms ; 35-50// in diameter. 

 Host attached to substratum by the insertion of its proboscis. 



Hosts. Hemiptera : several genera of aphides. 



Habitat. Kittery, Maine; vicinity of Boston, Mass. ; Europe. 



It is with much hesitation that I have placed under the above name a species occurring 

 in this country commonly, yet never very abundantly, on numerous aphides infesting the 

 white birch, Bidens and other plants, in late summer and autumn, associated as a rule 

 with other species which attack the same hosts. It is sometimes found also associated 

 with E. Aphidis in greenhouses where it may be found during the winter months. It 

 is very nearly related to E. apiculata, and, if not a variety of this species, forms a con- 

 necting link between it and E. Grylli. It differs from E. apiculata chiefly in the ab- 

 sence of rhizoids, which I have been unable to discover in fresh material after a careful 

 search, as well as by the variability of its conidia which are rarely pointed as in E. apicu- 

 lata, and vary from a form nearly spherical to one not separable from that of even the 

 longer forms of E. Grylli. The species may be placed under E. Planchoniana only pro- 

 visionally as may be understood from the following descriptions of the last named spe- 

 cies by Cornu. 



In speaking of the species, 1 Cornu says that the conidiophores, issuing from the body 



1 1. c. A. 



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



