208 ENTOMOLOGICAL KEWS. [June, 



backward, the others decussate; the front pair of ocellar bristles and the 

 two pairs of orbital bristles directed forward; vibrissae inserted slightly 

 above the oral margin, only two or three bristles above each; pile on 

 sid^s of face microscopic and very sparse ; cheeks scarcely one-fifth as 

 broad as the eye-height. Antennae three-fourths as long as the face, first 

 two joints yellow, the third black and less than one and one-half times 

 as long as the second joint; arista black, thickened on its basal third; 

 proboscis three-fourths as long as height of head, black, the label la and 

 palpi yellow. Thorax black, gray pollinose, marked with three brownish 

 vittae; three postsutural bristles; scutellum black, gray polHnose, a small 

 discal and three long marginal pairs of macrochaetae, the third pair 

 decussate and not quite reaching the tips of the second pair. Abdomen 

 yellowish, the extreme base and the greater portion of the fourth segment 

 blackish; wholly gray pollinose except a transverse row of three shining 

 blackish spots on the hind end of each segment, those on the fourth seg- 

 ment sometimes coalescing; an opaque black spot on the extreme sides 

 of each segment except the first, sometimes wanting on the second ; a 

 marginal pair of macrochaetae on each of the first three segments, some- 

 times wanting on the first, and a marginal row of eight on the fourth ; 

 hypopygium shining black, toward its apex yellowish, projecting one-third 

 its height below the plane of the venter, its tip furnished with a stout 

 black claw, which projects forward; underside of the fourth abdominal 

 segment considerably swollen. Legs black, the front and middle tibiae 

 yellowish, hind ones not ciliate ; pulvilli about as long as the last tarsal 

 joint. VVmgs grayish hyaline, veins brown, third vein bristly nearly to 

 the small cross-vein, the others bare; calypteres white, halteres yellow. 



9. — Differs from the ^ only as follows: front largely brassy yellow 

 pollinose, extreme base of abdomen yellow, middle of second segment 

 and nearly the whole of the two following ones blackish, all femora and 

 tibiae yellow, pulvilli about one-third as long as the last tarsal joint; gene- 

 talia not projecting. Length 3.6-4.3 mm. 



Northern Illinois, four males and nine females collected from 

 July to September, 1894, by Dr. W. A. Nason, after whom I 

 take great pleasure in naming this interesting species. 



ERRATA. 

 Page 148, fifth line from top, for there read them. 

 " 148, eighth line from top, for Ceoropia read Cecropia. 

 " 149, eleventh line from bottom, for Prunes read Prunus. 

 " 150, ninth line from top, for paper read pupa. 



Entomological News for May, was mailed April 27, 1895. 



