FUNGUS GNATS OF NORTH AMERICA. 59 



skin, but more extensive trials may give different results. The 

 cut surfaces of seed potatoes are readily attacked and the seed 

 at times seriously damaged especially where the soil has been 

 fertilized by barnyard manure. 



Other data along these lines are on hand and more experi- 

 ments are contemplated, .the results of which are to be pub- 

 lished at a later date. Besides the acknowledgments already 

 made in Part I, I wish to add that through the kindness of 

 Mr. Fredr. Knab I have had the privilege of again examining 

 the types in the U. S. National Museum. To Dr. E. P. Felt I 

 desire to express by obligations for the loan of type material of 

 Felt's and Lintner's species. 



THE MYCETOPHILINAE (Concluded.) 



24. Genus Phronia Winnerts. 

 Verb. Zool.-bot. Ges. Wien. XIII. 857, 1863. 



Lateral ocelli contiguous to the eye margin, the middle one 

 small, placed in a groove near the base of the frontal triangle; 

 antennje in the male frequently, in the female, usually cylindri- 

 cal. Legs slender, tibial setse delicate, fore tarsi of female 

 sometimes incrassate. Costa produced, sometimes but very 

 slightly, beyond tip of Rs ; subcosta short, rarely half as long 

 as the basal cell R, usually ending free, media forks distad 

 of the base of Rs, rarely directly under it, cubitus forks distad 

 of the fork of the media, its branches usually widely divergent; 

 anal vein incomplete. 



The forking of the media distad of the base Rs and the 

 slightly produced costa will distinguish this genus from 

 Bxcchia. 



Tabic of Species. 



a. Costa produced about 1-3 of distance from Rs to Mt; Mass. 



I. producta n. sp. 

 aa. Costa produced less than 1-5 of distance from Rs to ^Ii. 

 b. Fore tarsal joints 2-4 not distinctly swollen beneath. 



c. Hind coxae, and usually middle coxae also, fuscous, hypopygium 

 black (Fig. 25). 2. insulsa n. sp. 



cc. All coxas yellowish. 



d. Western or middle Vv-estern species. 



