146 MAINE AGRICULTURAL EXPERIMENT STATION. I9IO. 



broad front, the middle one smaller than the laterals ; palpi in- 

 curved, 4 jointed, the first joint very small, the second and third 

 subequal, the last one longer than the others taken together; 

 antennae projecting forward, somewhat compressed, 2-I-14 joint- 

 ed, the basal joints cupuliform, the flagellar joints cylindrical; 

 pubescent. Thorax very short, highly arched ; metanotum high, 

 scutellum small ; halteres with elongate knob. Abdomen long 

 and slender ; in the male somewhat clavate ; genitalia small 

 (figs. 118, ,121), abdomen in the female cylindrical, constricted 

 at the base, 7 segmented. Legs long, tibiae with spurs and with 

 lateral setse. Wings elongate oval, not longer than the abdo- 

 men, microscopic hairy. The costa is usually produced beyond 

 the tip of R4+5 and nearly or quite reaches the tip of the wing; 

 subcosta ends free or beyond the small cell R^, which is usually 

 shorter than wide, and noticeably proximad of the middle of 

 the wing; R^^, much curved or undulate, petiole of the media 

 much longer than the R-M crossvein ; the cubitus forks proxi- 

 mad of the fork of the media ; anal vein incomplete (figs. 88-90). 

 Immature stages unknown. 



It seems to me that the characters used to separate Bmpalia 

 from Polylepta are scarcely sufficient to give these independent 

 generic rank. 



Table of Species. 



a. Subcos-ta ends free. 



b. Subcostal crossvein stands on the small cell, which is ' 

 about twice as long as wide; Mass. i. fragilis. 



bb. Subcostal crossvein is far proximad of the small cell; 

 N. H., Ind. (fig. 90). 2. leptogaster. 



aa. Subcosta ends in the costa. 



b. Subcosta ends more than the length of the R-M cross- 

 vein distad of the small cell ; cubitus forks distad of 

 R2+3 (fig. 88). 3. obediens n. sp. 



bb. Subcosta ends opposite the distal end of the small cell ; 

 cubitus forks proximad of the R-M crossvein (fig. 

 89). 4. nigellus n. sp. 



For P. tibialis Coq. see genus Bmpalia. Walker's species P. 

 grisea (5) is not sufficiently well described to place generically. 

 1 suspect it is the same as Sciophila pallipes Say. 



