254 MAINE AGRICULTURAIv EXPERIMENT STATION. I9II. 



gg. Subcostal vein either longer than 4 of basal cell or it 

 does not end in Ri. 

 h. The R-M crossvein is in the same line as the sec- 

 ond section of the radial sector, thus apparently- 

 forming the basal section of the latter ; fork of 

 the media slightly distad of the fork of the 

 cubitus or under it, costa produced beyond Rs. 

 (Figs. 218, 241). 17. Docosia. 



hh. The R-M crossvein makes a distinct angle with 

 second section of 'the radial sector (Rs). 

 i. Subcostal vein more than i as long as the basal 

 cell R ending in Ri, costa produced little if 

 any beyond the tip of Rs ; basal seta of hind 

 coxa wanting. 



j. Setae of hind tibia short, not much longer than 

 the diameter of the tibia; three ocelli, mid- 

 dle one small. (Fig. 221). 19. Trichonta. 

 jj. Setae of hind tibiae usually arranged in 3 rows, 

 stout, more than twice as long as the diam- 

 eter of the tibia ; middle ocellus rarely pres- 

 ent; costa not produced beyond Rs. 



26. Dynatosoma. 



ii. Subcostal vein less than J as long as basal cell R. 



j. Cubitus forks noticeably distad of fork of 



the media, the branches of the former 



widely divergent ; costa but little produced ; 



anal vein short, tibial setae small; basal seta 



of hind coxa present. 24. Phronia. part. 



jj. Cubitus forks under or proximad of the 



fork of the media; branches of the former 



make a very acute angle with each other 



and are but slightly divergent, setae of hind 



tibiae strong, more than twice as long as the 



diameter of the tibia; ocelli 3; basal seta 



of hind cosa absent. 29. Epicypta, part. 



ee. Costa does not extend beyond tip of radial sector (Rs). 



f. Second palpal joint much enlarged, swollen, flattened 



ovate ; antennae very short, but little longer than the 



head, 11 to 16 jointed; ocelli 2; basal seta of hind coxa 



wanting. (Fig. 224). 20. Cordyla. 



ii. Second ' palpal joint not distinctly swollen, antennae 



longer than the head. 



g. Posterior basal seta of hind coxa present; ranges of 



setae on hind tibiae slender, (except in Brachypeza) 



usually little if any longer than the diameter of the 



tibia. 



