122 MAINE AGRICULTURAL EXPERIMENT STATION. I912. 



ii. Rs ends distad of .85 of wing length. 



j. Clasper with one prominent terminal or sub- 

 terminal spine or tooth, or if several teeth 

 are present, one is conspicuously larger than 

 the others, 

 k. Costa produced about 1-2 way from Rs tz 

 Ml. 



I. Halteres bright yellow ; claspers (Fig. 



125) ; wing (Fig. 243). ~~" 



35. nigricans n. sp. 



II. Halteres fuscous; wing (Fig. 217). 



36. actuosa n. sp. 

 kk. Costa produced over 1-2 way from Rs to 

 Mx. 

 1. Costa produced over 3-4 way from Rs 

 to Ml. (Fig. 244); halteres yellow, 

 daspers (Fig. 126). 37. S. sp. 



11. Costa produced less than .7 from Rs to 

 Ml. 

 m. Ri ends over 1-5 of wfng length prox- 

 imad of the forking of the media 

 (Fig. 245); halteres dark; clasper 

 (Fig. 127). 38. dolens n. sp. 



mm. Ri ends less than .15 of wing length 

 proximad of forking of M. 

 n. Apex of clasper with a number or 

 spines of which one is somewhat 

 larger than the others (Fig. 132). 

 o. Halteres yellow; clasper (Fig. 

 132). 39. diluia n. sp. 



00. Halteres dark; clasper (Fig. 

 140). diluta van a. 



nn. Spine of apex of clasper distinctly 

 differentiated from the apidal 

 setae (Fig. 115) ; halteres yel- 

 low. 

 o. Costa produced less than 5-8 of 

 distance from Rs to Mi. 

 p. Hind tibia a little shorter than 

 the tarsus; wing (Fig. 246). 

 40. varians n. sp. 

 pp. Hind tibia and tarsus sub- 

 equal in length. 



variafis var a. 

 00. Costa produced over 2-3 of dis- 

 tance from Rs to Mi. 

 , varians, var t. 



jj. Clasper with 2 or more prominent apical 

 teeth, spines, or with strong setas. 



