Insecutor Inscitiae Menstruus 



Vol. X APRIL-JUNE, 1922 Nos. 4-6 



THE AMERICAN AEDES OF THE SCAPULARIS 



GROUP 



(Diptera, Culicidce) 



By HARRISON G. DYAR 



In this group there is no sharp separation to be made between 

 the species on the characters of the male hypopygium. All are 

 essentially alike. The group itself, however, is sharply marked, 

 as shown by me (Itis. Ins. Mens., viii, 104, 1920). The group 

 is wholly American, having no representative in Europe. The 

 species are separable by the coloration of the adult, as follows : 



Mesonotum entirely yellowish brown thelcter Dyar 



Mesonotum with two yellow lines on a brown ground, the dorsal area 

 brown. 



The yellow lines very broad obturbator Dyar & Knab 



The yellow lines moderate, straight trivittatus Coquillett 



These lines narrow, widening posteriorly cuneatus Dyar & Knab 



These lines very narrow, straight angnstivittatus Dyar & Knab 



Mesonotum with a broad central golden band, the sides brown. 



Smaller species, abdominal bands narrow, pale tortilis Theobald 



Larger species, the abdomen with lateral white spots, .lynchii Brethes 

 Mesonotum with a broad central silvered area. 



Silvery area straight, running back to scutellum . . . mwi/cr Theobald 

 Silvery area rounded, situated anteriorly. 



Abdomen with basal segmental bands above, 



condolescens Dyar & Knab 

 Abdomen without dorsal bands. 

 Hind tibiae entirely black. 



Legs bright bronzy brown ; dorsum of abdomen 



metallic infirmatus Dyar & Knab 



Legs and dorsum of abdomen black, 



euplocamns Dyar & Knab 



Hind tibiae with a pale stripe below scapularis Rondani 



51 



