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. 

 c. Costa produced about 1-2 way from Rs to 

 Ml. 



I. Halteres bright yellow ; claspers (Fig. 



125) ; wing (Fig. 243). 



35. nigricans n. sp. 



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



36. actnosa n. sp. 

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

 Ml. 

 1. Costa produced over 3-4 way from Rs 

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

 claspers (Fig. 126). ZJ- S. sp. 



ll. Costa produced less than .7 from Rs to 

 Ml. 

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

 imad of the forking of the media 

 (Fig. 245) ; halteres dark; clasper 

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



.n^n. Ri ends less than .15 of wing length 

 proximad of forking of M. 

 n. Apex of clasper with a number of 

 spines of which one is somewhat 

 larger than the others (Fig. 132). 

 o. Halteres yellow ; clasper ( Fig. 

 132). 39. diliita n. sp. 



00. Halteres dark; clasper (Fig. 

 140). diluta var. a. 



nn. Spine of apex of clasper distinctly 

 differentiated from the apical 

 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. 



varians var a. 

 00. Costa produced over 2-3 of dis- 

 tance from Rs to Mi. 



varians, var b. 

 jj. Clasper with 2 or more prominent apical 

 teeth, spines, or with strong setee. 



