244 BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



inal specimens were from Indiana. I have no specimens from that re- 

 gion, except a well preserved male from Detroit, Michigan, which, be- 

 sides the white scales, has some fnlvous scales forming cross-bands on 

 the abdominal segments. Such scales not being mentioned by Say, I 

 am in doubt whether this specimen is his limatulus or not. 



3. Argyramceba pluto Wied. — The basal half of the wing is more 

 or less like the darker-colored specimens of A. limatulus ; the hyaline 

 portion has nine or ten small black spots, one at the extreme end of 

 the first vein in the shape of a small cloud, two on the concave end 

 of the second vein, two on the anterior branch of the third vein, 

 the one at its origin being large ; a spot, sometimes double, on the 

 cross- vein at the base of the second posterior cell, often coalescent with 

 a small spot on the vein separating this cell from the third posterior $ a 

 spot on the curvature of the cross- vein at the base of the third posterior 

 cell ; another at the proximal end of that cell ; one a little before the tip 

 of the fifth vein. The large spot on the cross- vein at the base of the 

 fourth posterior cell is usually coalescent with the black on the anterior 

 half of the wing. A long" stump of a vein on the geniculate base of the 

 second vein ; two stumps on the sinuosities of the anterior branch of tbe 

 third vein, one on each side ; a small stump on the cross-vein at the base 

 of the third vein. Body deep black 5 face and front with short, erect, 

 black pile, mixed with some white ones, especially around the mouth. 

 Abdomen with tufts of black pile on each of the first segment and some 

 white hairs along its hind margin ; small patches of white scales on the 

 sides and the hind margin of the third and fourth segments ; the end of 

 the abdomen in the male densely beset with white scales. 



This description applies to specimens about ll mm long, which I have 

 from Canada (F. X. Belanger), Pennsylvania (E. T. Gresson), and Waco, 

 Texas (Belfrage). But I have two other specimens, from Illinois (Le 

 Baron) and Texas (M. C. Z.), in which the black spots on the distal 

 half of the wings are so much enlarged that they coalesce and form an 

 irregular, broad cross-band, bifurcate at both ends; only three brown 

 dots on the apex of the wing are not confluent with this cross-band. A 

 specimen from Georgia (H. K. Morrison) holds the middle between 

 these two forms, its spots being larger than in the first form, and less 

 coalescent than in the second. This last specimen, as well as that from 

 Illinois, measures only 8-9 mm . I have little doubt now that all these 

 specimens belong to A. pluto. 



5. Argyramceba fur n. sp., £ 9. — Face and front pollinose with 

 yellowish-gray, and clothed with short black pile ; on the front, some 

 very minute pale yellow hairs are mixed with the gray ones ; the gray 

 occiput is more or less clothed on the orbits with hair of this latter 

 description. The dull grayish-black ground-color of the thorax and scu- 

 tellum is in part covered with a short, yellow, appressed tomentum ; a 

 large tuft of yellowish-white pile between the humerus and the root of 

 the wings, extending to the upper part of the pleurae ; a frill of whitish 



