THE MYCETOPIilLID.gi OF NORTH AMERICA. 2iy 



ee. The radius with but 3 branches (figs. 



77-81), 2. Sub-fam. MycetobiincB. 



cc. The radius with but 2 branches (fig. 91). 3. 



Sub-fam. Diadocidina. 



bb. The radio-medial crossvein (R-M) obhterated by the 



coalescence of a section of the basal portion of the 



radius and media at the point where the crossvein 



• usually is. (Figs. 82-90). 



c. Antennae short, usually thick set and often flat- 

 tened. (Figs. 82-89). 4. Sub-fam. Ccrop- 

 latince. 

 cc. Antennae very slender, and nearly as long and 

 often much longer than the body (fig. 90). 

 5. Sub-fam. Macrocerincc. 

 aa. The medio-cubital crossvein (M-Cu) absent. 



b. The anterior branch (R2-I-3) of the radial sector dis- 

 tinct, short, ending in Ri and appearing like a super- 

 numerary crossvein bounding distally the small 

 rectangular or: trapezoidal cell Ri (fig. 72). 6. 

 Sub-fam. Sciophilincc. 

 bb. Rs-fs not distinct from R4-I-5, the cell Ri thus open to 

 the margin of the wing. 

 c. Cox£e much elongated, (fig. 56), the R-AI cross- 

 vein usually distinctly angulated from the 

 second section of the radial sector; the cubitus 

 usually forks noticeably distad of the base of 

 the wing (fig. yT))- 7- Sub-fam. Myce- 

 topJiiliiKv. 

 cc* Cox?s not greatly elongated ; the R-M crossvein 

 in the same right line with the second section 

 of the radial sector; the cubitus forked near 

 the base of the wing. 8. Sub-fam. Sciarincr. 



I. Subfamily boutophilin^. 

 Bolitophilincc Winnertz, Verb. Zool-bot. Ges. Wien, XIII, 



657. 1863. 

 Long slender species, with abdomen having 7 to 9 visible 

 segments, 12 to 17 jointed antennae, coxae either long or short; 

 wings long and rather narrow ; radius 3 branched, both the 



