382 PROCEEDINGS OF THE AMERICAN ACADEMY. 



Trinchieri who found it at Naples, before the appearance of the pre- 

 hminary paper by Chatton & Picard in Comptes Rendus (CXLVI, 

 p. 208, 1908) was pubHshed. It was thus discovered almost simul- 

 taneously in Italy, Germany and France, and has since been found 

 in New England and received from various other parts of North 

 America. 



Having been interested to learn something further as to the distri- 

 bution and characteristics of the species in this genus, I have made a 

 special effort to accumulate material, and am especially indebted for 

 an opportunity to do so to the kindness of Prof. V. L. Kellogg, who 

 has allowed me to go over his very large accumulations of duplicates 

 in alcohol, and of Mr. M. A. Carriker who put his valuable collection 

 at my service. Mr. Kirkpatrick has also sent me Mallophaga from 

 turkeys and pigeons collected for me at the Rhode Island Experiment 

 Station, for which I am greatly indebted to him, and I have also 

 obtained material from Guatemala collected by the late Professor 

 W. A. Kellerman; from the Bahamas, (W. W. Worthington), as 

 well as from other sources. 



The results of my examination of some thousands of Mallophaga 

 have been somewhat disappointing, since their parasites are generally 

 rare, and, if the data obtained may be assumed to indicate the actual 

 conditions, have not found this aberrant group of insects a very 

 favorable substratum for the development of numerous or character- 

 istic species. As will be seen the following enumeration includes 

 only six additional forms, none of them, with the possible exception 

 of T. gihhus, departing very far from the characters of the type- 

 species. In all a more or less complicated rhizoidal apparatus is 

 developed, simple in one species, which penetrates the host. The 

 receptacle consists of two cells terminated by a bicellular apiculate 

 appendage resembling a spore of Puccinia, the upper giving rise to 

 fertile branches which grow downward and corticate the lower, the 

 corticating cells producing perithecia or antheridia according to the 

 sex of the individual; although in some instances the corticating cells 

 of the male are hardly developed, the antheridia arising directly from 

 single cells obliquely separated from the lower margin of the subbasal 

 cell of the receptacle. As in Dimeromyccs and Dimorphomyces, to 

 which the genus is most nearly related, the basal cells of the peri- 

 thecium break down, and the cavity of the latter and that of the stalk- 

 cell become continuous. 



