196 Illinois State Laboratory of Natural History. 



KEY TO GENI:HA OK AQIATIC TIPULID LARV^. 



I have carefully trauslated here Brauer's statements of 

 the characters of his two subfamilies, but have been 

 unable to verify them satisfactorily from my material. 



The last segment is subtruncate above the anal prom- 

 inence, and at the center of the truncation is usually a 

 pair of brownish stigmatal plates, often protected by a 

 ring of fleshy points or teeth. In the Limnobiinae [Fig. 

 24] this ring may consist of five teeth, the odd one at the 

 middle above, changing to four teeth by the disappear- 

 ance of this middle tooth; or in some there are 

 merely two large teeth below the stigmata; or the teeth 

 are very blunt or wanting. In the TipuliniB [Fig. 33] 

 six teeth about the stigmatal field are almost always 

 present. 



Mandibles hook-like, slender, usually not toothed, max- 

 illary palpi long; antennae small; last segment often 

 with single or double stigmatal tubes, sometimes a 

 pair of stigmatal plates; apex never distinctly stel- 

 late; often with false feet on prothorax or abdomen. 

 {LimnohiincB.) 

 Body with dorsal respiratory ^\sjmQwts....Phalacrocera. 

 Without dorsal respiratory filaments. 

 Last segment ending in a pair of long tail-like ap- 

 pendages, with the stigmata at their base, above. 

 {Amalopini and Gnophomyia.) 

 Abdomen with false feet. 



Pedicia, Dicranota, Gnophomyia, 



Abdomen without false feet Amalopis. 



Last segment [Fig. 24, 27] with five teeth about 

 the stigmata, the median above being about 

 equal to the others in size; dirty yellowish or 

 brownish, usually roughened or pubescent. 

 (Teeth all striped or blackish on inner face. 



Erioptera. 



Three upper teeth brownish on inner face; lower 



pair brown-margined SympUcta. 



