1'70 Till' CAXADIAX K.XTo.MoLOGlST. 



A Rl'.VISloX oK TIIK .\i<:ARC'riC vSI'KClRS Ol' TIIK 'IWClliNU) 

 GENUvS RRXIvSTIA R. I). ( 1)1 I'TI<:r.\ ) 



r,\ i)!<. joii X 1). 'roTiiii.L, 



In Cliiir.ui' (if Xilur.-il ("milrnl Iiivrsti.iiatidiis. Kiit(iiii()l(),i,'ic;il I'.raiicli. OKawa. 



( ( "oiitiiiu. (1 I'rdiu I'aiii' L'~)"-I I . 



Ernestia platycarina s]). n. 



/ h'scriftioii of iiKilc. Head at vil)rissae alxiut as iJiick as at base of 

 anti'iinaf ; vihrissac tar above the oral margin. Palpi rant^ini;; from _\'ello\v to 

 black'. l{_\es bairw Cheeks (below the eyes) white ])ollinose on a l)lack t^rounfl 

 subshinini;" on the lower hair\- jjart, a row of stouter hairs or bristles at the oral 

 margin. Distance from the oral mart^nn to the base of the eye equal to about 

 otic-th.ii"fl of the eve heij^ht. Sides of the face covered with sih'ery pollen; 

 bare; n;irrowest width slisjlitly less than the length of the second antennal seg- 

 ment Facial ridges bristlv on the lowest fourth. ]''acial depression silvery 

 pollinose. without anv carina. .\ntennae reaching the lowest fourth of the 

 face, all three segments black; third segment about one and one-half times as 

 long as the second, .\rista thickened on basal two-lifths, the i)enultimate seg- 

 ment sliglitK' longer than i)road. Width of the front at the narrowest point 

 measuring a shade less than the length of the second antennal segment; the 

 front sih'erv ])ollinose ; frontal vitta clnll. darkbrown, at the narrowest point 

 about e(|ual to the width of either side of the front just cei^halad of the ocellar 

 triangle. \'o orbital I)ristles. ocellars well dexeloped anrl proclinate, the single 

 row of frontal bristles descending nearl\- to the base of the third antennal 

 segment. 



Thorax, subshining, black, covered with gra\' pollen; scutelhnn gray pol- 

 linose on a black ground that becomes distincth' rufotis at the a])ex. Three 

 sterno])letirals ; three to foitr doi-socentrals. these showing considerable varia- 

 l)ilily ; scutelhtm uith three marginal ])airs of macrochaetae and an apical 

 (.•ruciate ])air. Legs black', the middk' tiliiae with two or more bristles on the 

 iront side near the middle, the hind tibiae withoitt a comb-like row ot bristles 

 on the outer side. Wings Inaline. R,,-, (third vein) with a grouj) ot two to 

 live hairs both above and below at the junction of R^.^.-.,. iiend of .M,,.^ withoitt 

 an ap])endage. T(,'gulae white. 



.Abdomen .subshining; sil\'er\- ])ollinose on a Ijlack ground. Discal and 

 marginal macrochaetae present on the second, third and fourth abdominal seg- 

 ments. The hind margin of the third abdominal segment somewhat arcuate. 

 The lilth tergum marked off- especialK la1erall\----by a suture from the sixth, 

 and at the lateral pai'l being about one-lifth as long as the lateral \ku'{ of the 

 lotn-th segment. Tlie sixth and sexcnth abdominal segments lorming the 

 somewhat prominent genital segments. 



(lenitalia rufous. TIk' basal pnvi of the outi'r forceps with a broad, 

 leal-like ex])ansion ; tlie basal ])ai'l ol llie inner forcei)S with a short, keel-like 

 median ])rojection. The edge of this projection farthest from the ])enis is 

 ilatlened, aud this lorms a rea(l\- means of distinguishing the species. 



The horseshoe-like indeniure extends about two-lifths to the base of the 

 lifth sternite. "^ 



