FUNGUS GNATS OF NORTH AMERICA. 187 



ADDENDA. 



Monoclona furcata n. sp. 



Resembles elegantnla in coloring but differs in the form of its 

 hypopygiiim, the slightly greater length of the fore metatarsus 

 relative to its tibia, and in the relative positions of apices of 

 So, Ri and R4+3. 



Male. Length 4 mm. Head black ; palpi, face, scape of an- 

 tenna and the 2 basal joints of flagellum yellow, the remaining 

 flagellar joints fuscous. Thorax yellow, the mesonotum with 

 3 blackish stripes, metanotum, some spots on the pleura and the 

 sternum more or less infuscated ; hairs pale. Each abdominal 

 tergite largely brownish, yellowish at the incisures, venter yel- 

 low ; hypopygium dark brown, each limb of the forceps with 2 

 strong hooks united to a broad base to which is attached a very 

 slender fishhook-like process projecting mesad. Legs yellow, 

 tarsi somewhat darker ; fore metatarsus over 0.95, the second 

 fore tarsal joint over half as long as the fore tibia; tarsal claws 

 each with a strong tooth at the base. Wings yellowish hyaline, 

 veins dusky yellow ; the small cell shorter than wide ; the dis- 

 tance from the apex of Sc^ to Ri is over 2.5 times the distance 

 from Ri to R.t+-, ; in elegantnla these distances are to each other 

 as 2 to I. Stem of the halteres yellow, the elongate knob black. 



A single specimen taken at Orono, Maine, May 26, 1910. 



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