THAXTER. — LABOULBENIALES PARASITIC ON CHRYSOMELIDAE. 19 



Dimeromyces Homophoetae nov. sp. 



Male individual amber-yellow. Receptacle consisting of three 

 or four cells each of which may bear an antheridium: the primary 

 appendage two celled, the basal cell shorter and broader, separated 

 by a constriction from the distal which terminates in a long sharp 

 spine and may often become one or more times septate, the terminal 

 cell proliferating distally to form an antheridium which thus appears 

 to be borne on a long several celled stalk on which the spine is lateral. 

 Antheridia two to five, the stalk well developed, rather slender; the 

 venter rather abruptly distinguished, though relatively narrow and 

 slightly shorter than the nearly straight stout neck which tapers but 

 slightly above its somewhat enlarged base. Total length to tip of 

 appendage 60 /x; to tip of antheridium 80 lx, of proliferous antheri- 

 dium 112 /x; normal antheridium including stalk about 35-40 X 6 lx. 



Female individual: receptacle suffused with amber-brown below, 

 distally amber-yellow; consisting normally of four cells obliquely 

 superposed, terminated by a two-celled primary appendage, the 

 terminal cell of which is narrower than the basal and about as long; 

 sometimes more or less inflated at its base, and ending in a long 

 straight sharp spine: the basal cell becoming rather deeply suffused 

 and extending upward against the base of the lower appendage which 

 is somewhat broader than the sub-basal cell from which it springs, 

 and slightly geniculate: the third cell giving rise to the normally 

 single perithecium, the fourth to a second somewhat smaller append- 

 age; the two appendages slender, simple, tapering, somewhat diver- 

 gent on either side of the perithecium, which is subfusiform with no 

 clearly defined stalk; the stalk-region hyaline, the rest of the peri- 

 thecium amber-brown, the tip distinguished by two successive in- 

 dentations below the hyaline three-lobed apex, the lateral lobes of 

 which are symmetrical and smaller than the much more prominent 

 median lobe. Spores 32 X 3.5 jjl. Perithecium, including stalk- 

 portion, 100-190 X 20-35 it. Total length to tip of primary append- 

 age 70 lx; to tip of perithecium 140-250 lx. Appendages, longest, 

 90-110 ix. 



On Homophoeta aequinoctialis Linn., No. 1577, Guatemala, on 

 inferior pro thorax; No. 2066, Grenada, W. I., on antennae, and No. 

 2475, Port of Spain, Trinidad, W. I. The specimens from Guatemala 

 are somewhat larger than those from Grenada, but correspond in all 

 other respects. The species appears to be more nearly allied to D. 

 Forficulac than to any of the other described forms. 



