CONTRIBUTIONS FROM THE CRYPTOGAMIC LABORATORY 

 OF HARVARD UNIVERSITY. No. LXXIX. 



NEW LABOULBENIALES, CHIEFLY DIPTEROPHILOUS 



AMERICAN SPECIES. 



» 

 By Roland Thaxter. 



Received February 28, 1917. Presented March 14, 1917. 



The present Contribution deals almost entirely with Laboulbeniales 

 parasitic on flies of various families, although I have thought best to 

 include as an addendum to my recent paper on species of Rickia 

 (These Proceedings, 52, 1, 1916), two additional species of this genus 

 which were accidentally omitted from it. With this exception only 

 forms from the Western Hemisphere are here included, numerous 

 others which have been received from Africa and the East Indies 

 being reserved for later publication. A majority of the new forms 

 belong to the genus Stigmatomyces, which proves to be large and very 

 difficult. Four or five species of this genus are already known to be 

 parasitic on coleopterous hosts, but of the thirty-five new forms here 

 included, only one is found on beetles, while one other is associated 

 with a host new for this genus, being parasitic on a minute Anthocorid 

 bug. The remaining forms of this, as well as of the other genera here 

 considered, all occur on Diptera. 



The hosts from w^hich this material has been obtained were collected 

 partly by myself in the West Indies; while various interesting forms 

 w'ere very kindly collected for me by Mrs. J. B. Rorer, at Bocas del 

 Toro, Panama; by Messrs. Bruce and Allen and by Mr. H. Phillip 

 in the Island of Grenada, B. W. I.; by Mr. Carriker in Venezuela; 

 by Mr. W. H. Mann in Mexico; by the late Professor Kellerman in 

 Guatemala and by Mr. Philip Calvert in Costa Rica. The Jamaican 

 and Arkansan forms were procured through local collectors. I desire 

 also to acknowledge my obligations for host determinations to Mr. 

 E. T. Cresson Jr., and to Professor A. L. Melander to whom I am 

 further indebted for the very peculiar Stigmatomyces Clinocerae. 



