OF WASHINGTON. 145 



tibiae with black macroclietae ; pulvilli tawny or testaceous ; claws 

 black, elongate. Wings smoky, gradually sub-hyaline on the inner 

 margin, more or less yellowish at base ; tegulae white, sometimes faintly 

 yellowish on the internal or the whole border ; halteres black. 



Female Differs from tllo $ in the very short claws, and in the more 

 nearly equal width of the front and face when viewed from before. 



Length of body, 10 to n mm. ; of wing, 7 mm. 



Three $ $ from District of Columbia and one 9 from Iowa. 

 It differs from euchenor in the sides of the second and third 

 abdominal segments not being clearly red, but the third seg 

 ment covered with silvery- white pollen in front like the fourth. 

 The whole insect is more deeply black and the antennae are 

 entirely black. 



Wahlbergia atripennis nov. sp. 



? Syn. Phasia atripennis Say. 



Male Black and light orange. Head wider than the thorax ; eyes 

 large, brown ; front nearly one-third the width of the head, with a broad, 

 deep black, velvet-like vitta occupying the entire width at the vertex, 

 but narrower towards the antenna;, at the bases of which it widens again; 

 sides of the anterior three-fourths of the front, with the borders of the 

 eyes, bright golden, face light yellow ; antennae short, blackish, third 

 joint nearly the same length as the second, reddish at base, the second 

 joint shading to reddish and black bristly ; proboscis black or brownish, 

 geniculate, the upper membranous portions whitish ; palpi light reddish- 

 yellow, black hairy ; cheeks and occiput silvery, with grayish hairs be 

 low and black hairs on the upper border. Thorax velvet black, with 

 black bristles, the transverse suture golden, irregularty defined in front, 

 humeri broadly golden ; posterior margin of mesoscutum golden, ex 

 tending forward nearly to the transverse suture.; pleurae silvery, upper 

 portions golden in certain lights ; scutellum black, with black macro- 

 chetse. Abdomen cylindrical, of a clear light orange-yellow, covered 

 with short black depressed bristles, becoming thinner on the sides and 

 venter ; first segment deep black at base, in some specimens nearly all 

 black, in others just touched with black ; fifth and sixth segments and 

 posterior or greater part of dorsum of fourth, with median dorsal spots 

 of second and third segments, usually much darker, of a light rusty or 

 pale ferruginous ; a median dorsal pair of sub-erect short black macro- 

 chetae near the posterior border of each segment ; venter of first three 

 segments and often a portion of the fourth light yellow, at tip blackish. 

 Ivegs black, basal third to half of front and middle femora and three- 

 fifths of hind femora orange-yellow ; coxae yellowish, covered with 

 silvery pollen ; femora evenly covered with short depressed bristly 

 hairs ; rest of legs gather more finely hairy, tibiae in addition with a few 

 strong bristles, usually about 8 or 10 on each hind tibia and from i to 5 

 or 6 on the front and middle pairs ; claws long, of equal length with the 



