FUNGUS GNATS OF NORTH AMERICA. 32I 



Addenda. 



Dr. H. Dziedzicki of Warsaw, Russia, recently informed me 

 that the hypopygium of Platyura diluta Lw. is identical with 

 that of P. unicolor Winn., and that of P. subtermmalis is like 

 that of P. infuscata Winn. As the last two also resemble each 

 other in other particulars they may be identical. Platyura parva 

 belongs to Enderlein's new genus Paraplatyura, R2+3 ending in 

 Ri. 



Prof. T. D. A. Cockerell called my attention to an error in Part 

 II (p. 131). Tetragoneura peritiila should have been recorded 

 from near Rifle, Colorado, an Eocene locality. 



On page 136 in the description the hypopygium oi S. galbana 

 for inferior read superior, for dorsal read ventral, and vice 

 versa. Similar corrections must be made under explanation of 

 figure 122, page 192. For glabana read galbana. (Part II). 



In the tables of leg measures on pages 323-325 the letters 

 ct or t following a name signify that the measurements were 

 made upon the cotype or the type specimen. 



Since the publication of my previous papers on the 

 Mycetophilidae in Bulletins 172 and 180 of this Station and in 

 Genera Insectorum, Fasc. 93 there have appeared two papers 

 by Dr. Enderlein (Trans. Linn. Soc. London, 1910, and Stettin 

 Ent. Zeit. 1911) on this family of flies in which some additional 

 genera have been proposed. As some of these genera occur in 

 America it is desirable to give a brief synopsis of each with 

 such differential characters as may be necessary to distingui-h 

 them from the older genera as characterized in the synoptic 

 tables published in the previous papers of this series and in 

 Genera Insectorum. 



Mycetobiinae. 

 Mesochria is related to Mycetobia but differs in having con- 

 tiguous eyes, and a coalescence of the tips Ri and R24-:t. Scotella 

 I consider a Sciophiline. See below. 



Ceroplatinae. 

 Placoceratias difl^ers from Ccratelion in possessing but 2 

 ocelli. In Paraplatyura R2+3 ends in Ri in this respect difi^ering 

 from Platyura. P. parva from the St. Vincent Isl. should be 

 placed here. 



