THE CANADIAN ENTOMOLOGIST. 21 



where it joins the costa abruptly; sheath broad at base, tapering to an 

 obtuse point. Colour black ; posterior and upper orbits, face below 

 antennae, clypeus, labrum, mandibles, except tips which are piceous, palpi, 

 posterior angles of pronotum, tegulae, legs entirely, apical segments of 

 venter, reddish-yellow ; flagellum beneath and entire apical joints rufous ; 

 posterior tarsi infuscated. Wings hyaline, nervures pale brown, costa and 

 basal half of stigma pallid. 



<£ . — Length, 43^ mm. More slender than $; differs from the ? 

 as follows : ocellar basin present, but very shallow, bounded by low 

 rounded walls ; middle fovea shallower; stigma rounded on lower margin; 

 lower discal cell of hind wing slightly exceeding lower; clypeus, labrum, 

 mandibles, pallid. The mandibles are sharp, with a small inner tooth ; 

 procidentia rounded at apex. 



Habitat.— %, Delta, Colo., April 23, '97 (C. P. Gillette), "Willow 

 galls"; 6*) Ft. Collins, Colo., March 30, '97 (E. G. Titus), "emerging 

 from Willow galls collected in Jan."; $, same as last; $ , Delta, 

 Colo., April 28, '97 (C. P. Gillette), " Willow galls, flies emerging May 

 23." The first 9 and <$ are the types. Type in the collection of the 

 Colorado Agricultural College. 



This species falls near E. insularis, Kincaid, and E. salicicola, E. A. 

 Sm. It may be known from the former by the different shaped stigma, and 

 from the latter by the more aculely pointed sheath. There are also other 

 characters to separate it from these two species. 



MOSQUITO COMMENT. 



BY C. S. LUDLOW, PH. D. 

 Laboratory of the Office of the Surgeon-General. U. S. Army, Washing-ton, D. C. 



Reference to Dr. Dyar's recent article* is only necessary because his 

 comment on A. perplexens mihi, may be construed to imply a carelessness 

 in my work which does not exist. Naturally, Dr. Dyar could not know 

 that the only times any interchange of lids has occurred have been when, 

 at the National Museum, he, Dr. Knab and myself were discussing species, 

 and it was impossible for me to keep track of all the lids ; in these cases 

 the mosquitoes were destroyed on my return to my rooms. Moreover, A. 

 perplexens was found in a box with typical American mosquitoes which 

 were undoubtedly taken at Gretna, Pa. My boxes are not uniform, nor 

 is more than a small proportion of the collection even temporarily kept in 



*Notes on Mosquito Work, Can. Ent., Sept., 1908, page 312. 

 January, 1909 



