12 PROCEEDINGS OF THE AMERICAN ACADEMY. 



foot ; the basal and subbasal cells constituting a " primary receptacle ; " 

 the latter giving rise to a variably developed fertile branch (sometimes 

 apparently dividing to several cells each of which may produce a fertile 

 branch) from which is developed a "secondary receptacle," or, as a 

 result of branching, more than one. Secondary receptacles consisting 

 of a partly double series of cells, variable in number, one or more of 

 which may be fertile, the rest sometimes specially differentiated, or 

 unmodified ; those in contact with the host perforating the chitinous 

 integument by means of fine haustoria. Trichogynes short filamentous. 

 Perithecium borne on variably developed stalk-cells, the ascigerous 

 portion including three tiers of wall-cells, more or less clearly distin- 

 guislied from the distal portion, the wall-cells of which are more or less 

 differentiated, four or, five in each row. Spores minute, of the usual 

 type, normally discharged in pairs the members of which produce male 

 and female individuals. Asci apparently eight-spored. 



The discovery of this very remarkable genus is due to Mr. Charles 

 Bullard, who first observed it on Ectobia and Periplaneta in Cambridge. 

 Though perhaps distantly related to Moschomyces it is in some respects 

 unique, and with the exception of Dimeromyces is the only genus which 

 contains species inhabiting orthopterous hosts. The peculiar cell rela- 

 tions of the perithecia and secondary recei^tacles seem unlike those of 

 most genera, but a further description of them seems undesirable in the 

 present connection. 



Herpomyces chaetophilus nov. sp. 



Male individual consisting of four superposed cells, hyaline, the distal 

 cell terminated by a blackish projection similar to the small foot. The 

 three distal cells, sometimes only the terminal one, usually producing 

 slight outgrowths which bear the single, nearly erect, long, slender 

 antheridia directly; or may separate a cell which bears one, or very 

 rarely two such antheridia ; the latter nearly as long as the four-celled 

 individual. Total length to tips of antheridia 50-55 /n. 



Female individual. Primary individual similar to the male, but 

 stouter ; terminated by a similar blackish projection. The fertile branch 

 arising laterally from the subbasal cell, growing down in the form of a 

 slender filament variable in length, usually of two or three cells, enlarg- 

 ing abruptly to form the single secondary receptacle. Secondary recep- 

 tacle pale dirty brownish yellow, consisting of a vertical series of cells 

 partly double above, simple below ; the cells thick-walled, the long (trans- 

 verse) axes directed obliquely upward and outward, about five to fifteen 



