CONTRIBUTIONS FROM THE CRYPTOGAM IC LABORATORIES 

 OF HARVARD UNIVERSITY. No. LXXVIII. 



NEW OR CRITICAL SPECIES OF CHITONOMYCES AND 



RICKIA. 



By Roland Thaxter. 



Presented May 10, 1916. Received March 28, 1916. 



The new forms herein described are, with few exceptions, parasites 

 of tropical hosts which have been collected for me through the kind- 

 ness of the Rev. George Schwab in Kamerun, Mr. J. C. Moulton in 

 Borneo, and Mr. Oakes Ames and Mr. C. S. Banks in the Philippines. 

 The West Indian forms were for the most part collected by myself; 

 a few, together with certain Central American hosts, having been 

 examined in the collections of the Musemn of Comparative Zoology 

 at Cambridge, through the courtesy of Mr. Samuel Henshaw. 



Since the paper deals with two genera, onl}^ it is hardly necessary 

 to remark that it includes only a portion of the novelties thus obtained, 

 further additions to which will be published later. I desire again in 

 this connection to acknowledge my obligations to the gentlemen above 

 mentioned, as well as to ISIr. Gilbert A. Arrow, of the British Museum, 

 who has been so kind as to determine for me numerous coleopterous 

 hosts. 



Chitonomyces. 



Since the cell-number and arrangement in a majority of the species 

 in this genus are more or less definite, it has seemed best in the follow- 

 ing diagnoses to letter the successive cells as follows: The basal cell a, 

 the subbasal b. The latter is usually followed by three cells which 

 normally form a series horizontally disposed, the anterior c, the 

 median d, and the posterior e. The relative position of these cells 

 may, however, vary considerably, and the anterior may become much 

 reduced in size and lie above cells d and e. Of the posterior cells 

 which lie normally beside the perithecium, the lowest, and usually 

 the longest, is distinguished as cell /, the distal end of which is sepa- 

 rated by a septum to form the small appendiculate cell h, external to 



