THE MYCETOPHILID.^ OF NORTH AMERICA. 21/ 



ee. The radius with but 3 branches (figs. p 

 77-81), 2. Snh-fam.^ Mycetobiince.^^' 

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

 Sub-fam. DiadocidincB. /^T.J. —5/.. H!" 

 iD-b, 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. Antennse short, usually thick set and often flat- 

 tened. (Figs. 82-89). 4. Sub-fam. ^/ C^rop- L 

 latm(2. PlTrX'i^r 

 cc. Antennae very slender, and nearly as long and 



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

 5. Sub-fam.v Macrocerincc. ^' '^, i-O'^" ^ 



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



b. The anterior branch (Ra-f-s) 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. /T 

 Sub-fam. SciophiIin(T. > ■ 

 bb. R2-f3 net distinct from R4+5, the cell Ri thus open to 

 the margin of the wing, 

 c. Coxae much elongated, (fig. 56), the R-M cross- 

 vein usually distinctly angulnted from the 

 second section of the radial sector; the cubitus 

 usually forks noticeably dist?d of the base of 

 the wing (fig. 73). 7. Sub-fam. .- Myce- £" 

 tophiHn(r. ^ :/.".' •''/'• "" 



cc. Coxae 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. Sciarince. 



/-7 f^ 



I. Subfamily boutophiein.^. 

 BolitophilincE 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 



