136 THE CANADIAN ENTOMOLOGIST 



fifteen antennal segments (11 in Rhapliidolahis rcdnchi; 12 in Rliaphidolahis 

 subsessilcs, and Dicranota nippnnica; 13, the normal number for the group; 14 

 in Rliaphidolahis fkn^ibasis; 15 in Rhaphidolabis fasfipcmiis and uther Oriental 

 species). 



Dicranota ro§:ersi, new species. 



General coloration gray ; mesonotal praescutun with three broad dark 

 brown stripes ; antennae of male elongate ; wings faintly tinged with brown ; 

 stigma dark brown ; a paler brown seam along the cord ; cell M> normally pres- 

 ent ; cell 1st M2 open by the atrophy of ;/;. male hypopygium witli two subequal 

 pleural appendages ; the chitinized blade at base of pleurite with the stem less 

 elongate than in D. cuccra. 



Male. — Length about 5.8 mm. ; wing 6.6 — 7.5 mm. 



Female. — Length about 7.5 mm. ; wing 9.3 mm. 



Rostrum brown, grayish pruinose. Antennae with 13 segments, in the 

 male very long, if bent backward extending nearly to the base of the third ab- 

 dominal segment ; first scapal segment obscure reddish ; remainder of antennae 

 dark brown; flagellar segments elongate cylindrical. Head dark brown, the 

 vertex adjoining the eyes broadly yellowish gray. 



Mesonotal praescutum with a yellowish gray pollen, with three conspicu- 

 ous dark brown stripes, the broad median stripe very indistinctly split anteriorly 

 by a capillary pale line ; interspaces with erect yellow setae ; scutum yellowish 

 gray, the centers of the lobes dark brown ; scutellum and postnotum light gray. 

 Pleura gray. Halteres pale, the knobs slightly darkened. Legs with the coxae 

 pale, with a sparse grayish pollen ; trochanters obscure yellow ; femora dark 

 brown, yellowish basally ; remainder of legs dark brown. Wings faintly infus- 

 cated; stigma conspicuous, dark brown, occupying cell 2nd Ri and the distal 

 end of cell Sci ; paler brown seams along the cord and at the origin of R s . 

 veins dark brown. Venation : S^ long, extending to slightly beyond r ; i^ ^^ • 

 far before fork of R+ , the distance a little greater than that section of S 

 beyond R^, ; R^ moderately long, angulated at origin; Rj + » about equal to 

 the deflection of R2; r rather indistinct; R^ less than its own length from the tip 

 of Ri, entirely provided with macrotrichiae ; cell Mi present in normal individuals; 

 cell 1st M2 open by the atrophy of m; petiole of cell M:^ a little shorter than tlic 

 cell ; basal deflection of Cui about one-half its length beyond the fork of M. 



Abdominal tergites brown, with about the posterior half of each segment 

 paler brown ; sterites a little paler than the tergites. Male hypopygium with the 

 pleurites short and stout, the caudal lateral angle produced into a short, blunt 

 lobe; two sub-equal pleural api)endages; outer appendage fleshy, provided with 

 several long setae; inner appendage subchitinized, with a patch of long, erect 

 setae on the proximal face at the base and a group of short setae on the outer 

 face near the tip: at base of pleurite a chitinized blade that is produced into a 

 beak-like structure with the point directed laterad. 



Habitat. — Michigan. 



Holotype, , Gogebic County, August 17, 1920 (J. S. Rogers). 



Allotopotype,^. 



Paratopotypes, 8 ^^. 



Type in the Collection of the Museum of Zoology, University of Mich- 

 igan. 



