66 THOMAS SAY FOUNDATION 



Distribution. — Arctic America. 



A pair in the collection of the Museum of London. 



Perlodes vagans Smith. 



( Plate 10, figs. 2, 9. I 

 1!M7. Arcynopteryx vagans Smith, Trans. Amer. Ent. Soc, 43:478. 



Having nothing to add to Miss Smith's account of this 

 species we copy her original description herewith : 



Male. Long-winged. Length to tip of wings, 16 mm. ; 

 expanse of wings, 26 mm. Short-winged. Length to tip 

 of wings, 14 mm. ; expanse of wings, 21 mm. 



Color : Yellowish-brown varied with yellow markings on 

 the head and thorax, and paler beneath. Head triangu- 

 larly produced ; three small ocelli placed in an isosceles 

 triangle, its base greater than the sides, the distance from 

 the inner margin of the eye to the posterior ocellus 

 greater than the side of the triangle, but not as great as 

 the base. On either side of the ocellar triangle, a glossy, 

 dark brown, oval tubercle, somewhat nearer the posterior 

 ocellus than the inner margin of the eye. M-shaped mark 

 conspicuous. Labrum whitish. From the tubercle a 

 broad, dark fuscous area extending laterally to the eye 

 and encircling its inner margin with a narrow band which 

 spreads out posteriorly, covering the entire occipital 

 region behind the eye, anteriorly the band broadens and 

 runs along the lateral border of the frons and clypeus. In 

 one specimen at the level of the anterior ocellus, a trans- 

 verse bar connecting the dark areas of either side, in the 

 same specimen, from the tubercle a posterior extension, 

 running slightly diagonally inward to the occipital mar- 

 gin. Three pale yellow, coarsely corrugated spots on the 

 posterior border of the occiput, a small median triangular 

 one with its apex directed forward, and on either side 

 close to the dark fuscous areas behind the eyes, a large 

 oval spot. Antennae brown, stout, as long as the body; 

 palpi brown ; under side of head, pale. 



Pronotum trapezoidal, anterior border wider than the 

 posterior and wider than the occiput, sides and posterior 

 margin straight, anterior margin convex, front angles 

 rather sharp, hind angles rounded off; a broad, median, 

 yellow stripe, conspicuous, glossy brown, embossed mark- 

 ings on the lateral fields. Meso- and metanotum dark 

 brown with the median yellow band of the pronotum con- 

 tinued upon them. The entire venter of the prothorax 

 pale with darker markings. Legs yellowish-brown ; bases 

 and tips of femora and tibiae and tip of tarsi, ringed 



