256 MAINE AGRICUIvTURAI, EXPIJRIMEiNT STATION. I9II. 



ii. Genitalia rot as described above. 



•j. Two ocelli, none in the middle ; costa not pro- 

 duced beyond the tip of the radial sector; 

 branches of cubitus usually parallel on 

 apical third. (Fig. 245). 31. Mycetophila. 

 jj. Three ocelli present, middle one minute. 



k. Branches of the cubitus make a very acute 

 angle with each other and slightly diver- 

 gent; fork usually proximad of the fork 

 of the media; costa usually slightly pro- 

 duced beyond the tip of the radial sector. 



29. Epicypta. 

 kk. Branches of the cubitus more or less con- 

 vergent, rarely parallel, fork fretfuently 

 distad of the fork of the media; costa 

 ends at tip of Rs. 30. Myc&thera. 



I. Genus Gnoriste Meigen. 



Syst. Beschr. i. 243. 1818. 



Proboscis slender, longer than head and thorax combined; 

 the palpi near the apex (Part I, fig. 53) ; ocelli 3, the laterals 

 remote from the eye margin. Wings large; costa produced 

 beyond tip of the radial sector (Rs) ; subcostal vein long; sub- 

 costal crossvein (Sca) present; fork of the cubitus proximad 

 of the fork of the media; anal vein incomplete. (Fig. 169). 



Table of Species. 



a. Proboscis over .7 the length of the insect to tip of abdomen; cubitus 

 forks proximad of the proximal end of the crossvein, somewhat 

 variable; costa distinctly produced beyond the tip of Rs; sub- 

 costa ends at or proximad of the base of Rs. N. Y. ; Calif. (Fig. 

 169). I. megarrhina. 



aa. Proboscis less than I of the length of the insect. 



b. Proboscis over half the length of the insect ; fore metatarsus and 

 its tibia subequal in length. 2. groenlandica. 



bb. Proboscis less than J as long as the insect; fore metatarsus short- 

 er than the tibia, 

 c. Cubitus forks slightly proximad of the base of Rs ; the sub- 

 costal crossvein indistinct, proximad of the middle of the 

 subcosta. (Fig. 170). 3. macra n. sp. 



cc. Cubitus forks nearly under the base of Rs ; the subcostal 

 crossvein distad of the middle of the subcosta. 4. apicalis. 

 G. dentoni Scudder is a fossil from Utah. 



