INSECUTOR INSClTli^ MENSTRUUS 81 



29. Basal hooks long, broad, curled 30 



Basal hooks very short tosimus Dyar 



30. Outer division of lobe of side-piece with the middle filament remote 



from the outer group maxinocca Dyar 



Middle filament and outer group approximate, 



chrysonotum Dyar & Knab 



31. Filament adjacent to middle filament of outer lobe of side-piece 



not widened, minute educator Dyar & Knab 



This filament widened-spatulate or narrowly leaf-like. .z/a;rM.y Dyar 



32. Second uncal plate with the inner arm dentate, the outer smooth ; 



third horn just below the furcation 33 



Second uncal plate with the three points in a triangle, none 

 dentate 34 



33. Horn of second plate very large ; middle filament of outer division 



of lobe of side-piece with a large insertion bibulus Dyar 



This horn small ; middle filament without large insertion, 



iolambdis Dyar 



34. Inner division of lobe of side-piece with the arms separated, 



inhibitator Dyar & Knab 

 These arms not separated, parallel on a common stem 35 



35. Outer division of lobe of side-piece long, with inner filament in- 



serted close to base, leaving the outer group of setae on an 



arm jonistes Dyar 



This division short, with an inner arm 36 



36. A long, squarely hooked filament from base near side of outer group 



of filaments of outer division of lobe of side-piece. .ido/fM.y Dyar 

 Without this structure xivylis Dyar 



A NEW MOSQUITO FROM MEXICO 



(Diptera, CiiUcidce) 

 By HARRISON G. DYAR 



Aedes (Heteronycha) muelleri, new species. 



Proboscis and palpi black; legs black, the basal portion of 

 femora broadly white below, running narrowly nearly to tip; 

 knee-spots white. Head and mesonotum light yellow scaled, 

 the latter with two moderately broad dark brown bands, run- 

 ning back narrowly to the scutellum, and short narrow side 

 stripes posteriorly. Abdomen black scaled, with basal, seg- 

 mental, triangular, white, lateral patches in the female, becom- 

 ing basal bands in the male ; venter pale scaled, with a medio- 



