330 THE CANADIAN ENTOMOLOGIST. 



It may be that semiprcestans is a distinct species, but it seems better 

 at present to treat it as a form o{fragari<2. 



In 1894 and 1896 Mr. Beutenmiiller treated Pyrrhotcenia helianthi as 

 a synonym o{/raga?'icE, but in his Monograph of the Sesiidae, he makes it 

 a synonym of 6". Behrejisii {Yiy. Edw.). The name helianthi, however, 

 has priority over Behrensii, and the species must be known as Sesia 

 helianthi (Hy. Edw.). 



Sesia florissantella, n. sp. 



^. — Length, 8 mm.; anterior wing about 51^ ; no red or yellow 

 about the insect ; antennae black, with a small apical tuft; the basal half 

 of the antennae beneath is finely denticulate, and also furnished with 

 numerous curving hairs ; occiput with long, coarse, faintly yellowish hair; 

 vertex with black hair or scales ; cheeks with white hair, and face with 

 while scales ; palpi long and very bristly, the clothing black on the out- 

 side, white above and within ; tongue slender ; thorax above black, with 

 strong greenish-metallic tints, the collar strongly brassy ; sides of thorax 

 with large black and white scales, a conspicuous patch of while just 

 beneath the wings ; legs black and white, the long hair on femora beneath 

 white, spurs white, hind basitarsus nearly all white, as also second joint 

 within and at apex, hind tibise with much white about the middle ; anterior 

 wings purple-black, with scattered white scales, a small white mark 

 (peppered with black) in the cell, and conspicuous white streaks in the 

 apical field ; hind wings transparent peaily-white, except for the black 

 costa and scales on the veins ; fringes of both wings long and black ; 

 abdomen purple-black ; some while scales on second segment ; a narrow 

 pure white band on fourth, and an apical white band on the penultimate 

 one ; caudal tuft black. 



Hab. — Florissant, Colorado, June 25, 1908, in a very dry place 

 {Cockerell). A distinct little species, in colour resembling S. arctica, 

 Beutenm., as much as anything. It appears to be related most closely to 

 S. nigra, Beutenm., known only in the female. It is barely possible that 

 it is the undescribed male oi nigra, but the differences in the colour of the 

 wings are so great that this cannot be assumed. 



yEgeria tibialis (Harris), van Dyari, n. van 

 9 . — Thorax purple-black ; lateral bands in front very broad, but the 

 longitudinal lines very narrow ; posterior dorsal yellow spots very large ; 

 abdomen with first segment black ; second black, narrowly yellow at base; 



