INSECUTOR INSCITI^ MENSTRUUS 127 



Prof. Friedrich Hendel, of Vienna, who has done so much to 

 advance our knowledge of the Acalyptrate Muscoidea. 



The extent of the apical wing-spot is somewhat variable. 

 Usually it is limited by the fourth vein, but in one specimen 

 extends well over into the second posterior cell; in another 

 specimen it stops short of the middle of the first posterior cell. 

 There is also some variation in the mesonotal coloration, the 

 stripes being obsolete or nearly so in some specimens. 



A NEW AEDES FROM THE ROCKY MOUNTAIN 



REGION 



(Diptera, Ciilicidce) 

 By HARRISON G. DYAR 



Aedes acrophilus, new species. 



Head with creamy yellow scales ; a black spot on each side 

 of the vertex and a lateral one below. Mesonotum with golden 

 brown scales, creamy on the lateral margins and antescutellar 

 space; two narrow lines of dark brown, small scales and still 

 narrower posterior subdorsal lines ; a narrow central dorsal 

 dark line, formed by the parting of the scales. Abdomen 

 black, with basal segmental white bands, widening at the sides ; 

 venter whitish with traces of medioventral black spots near the 

 apices of the segments. Wing scales black. Legs black; 

 femora white beneath nearly to tip ; knee spot white ; tibiae 

 largely gray-scaled. 



Larva. — Head hairs, upper in 5, lower in 4 ; lateral comb of 

 the eighth segment of about 20 scales, evenly fringed, without 

 strong central spine ; anal segment with large plate, not ringed ; 

 air tube moderate, the pecten evenly spaced, the tuft arising 

 beyond it. 



Type, female. No. 21548, U. S. Nat. Mus. ; Lake Louise, 

 Laggan, Alberta, Canada, August 18, 1906 (Dyar and Cau- 

 dell). 



Of the described Aedes with black legs from North America, 

 the larvae of the following are unknown : diantaeus Howard, 

 Dyar & Knab, thibaulti Dyar & Knab, aldrichi Dyar & Knab, 



