2(52 Transactions British Mycological Society. 



kinds: the first like the primary, the second almond-sha.ped 

 and borne obhquely on capillary conidiophores. Resting 

 spores, zygospores, elliptical or subovoid, yellowish, becoming 

 often smoky and opaque, formed by the conjugation of two 

 small, spherical hyphal bodies by means of slender gametes, 

 above the point of junction of which the spore rises as a bud; 

 average measurements 30 x igix. Host attached to sub- 

 stratum by the insertion of its proboscis. 



Habitat. In Rhopalosiphum lactucae Kalt. and Myzus 

 Whitei Theobald, on gooseberry, Swordale, Evanton, August 

 1918; R. persicae on potato, Stirkoke, Wick, Sept. 9, 1918. 

 Coll. D. J. Jackson, Aug. 1918. Apparently not uncommon 

 in eastern states of America, being recorded from several 

 localities by Thaxter. 



"Several apterous viviparous females of R. persicae found 

 adhering to the underside of potato leaves were covered with 

 this fungus. Other specimens developed the fungus when in 

 captivity. The fungus was ochreous white on some specimens 

 and pale pinkish in others." D. J. J. 



Empusa (Entomophthora) sphaerosperma, Fresenius, Notiz, 

 p. 883; Thaxter, Entomoph. United States, pp. 172- 

 175, PI. 17, figs. 200-219. 



Conidia long-elliptical to nearly cylindrical, papillate 

 at base and tapering very slightly near the rounded apex; 

 15-26 X 5-8 /x, average 20 x 5-5 /x; usually with a fine granular 

 contents and a central oval nuclear body. Conidiophores 

 digitate, much branched and confluent over the body of the 

 host, forming usually a mass the upper surface of which is 

 flattened. Colour of the fungus as a whole white, varying 

 to bright pea green. Cystidia slender, tapering, not abundant. 

 Secondary conidia like the primary, or long almond-shaped and 

 borne on a capillary conidiophore. Resting spores, azygospores 

 or zygospores (?), borne laterally or terminally from hyphae, 

 20-35 /x, average 25/x, spherical, hyaline or very slightly yellowish. 

 Host attached to substratum by rhizoids. 



Habitat. In a small green caterpillar on grass. Rushton, 

 Somerset. Coll. W. Watson, May 1918. 



A widely distributed and common species and one remarkable 

 for the great diversity of its hosts, being known to occur on Lepi- 

 doptera, Hymenoptera, Diptera, Coleoptera, Hemiptera, Neurop- 

 tera, Thripidae. Thaxter notes that it produces epidemics of 

 considerable proportions and mentions clover weevils and certain 

 small flies being killed in large numbers. In a third case a 

 severe epidemic occurred on the leafhoppers of roses and apples 



