234 ' DIPTERA 
Thorn-like setule gf forming a regular, uniform, 
conspicuous row, of Q seriate but microscopic in 
size ; facial tubercle not conspicuous, located nearer 
the emarginate oral margin, the lower part of the 
face scarcely carinate, the upper part white . . .  CHAMEDIPSIA CTENISTES, hov. sp. (1). 
18. Thorax bivittate. . . . MEM NL uM I E 19. 
"Thorax not vittate; wings nite. d no ign: s uec P. pD IA S PLN MICE MEN 
19. Wings maculate, stigma very distinct; face entirely 
white . . . . HynpnopRowiA LECTA, Melander. 
Wings not UE. no feme hus CERES MONEO x cc Ee uc T 
20. Legs black; wings lightly infumated . . . . . . CLINOCERA TRUNCA, nov. sp 
Legs hoary; wingsslightlygray . . . . ? HvpRoDROMIA LoNGIPEs, Walker. 
21. Second posterior cell very acute at the drskiuat indi 
face not tuberculate. . . . CrtNOCERA LEPIDA, Melander. 
' Second posterior cell sessile; center i de hi black 
andstrongly tuberculate . . . . . . . . . CHAMEDIPSIA GUBERNANS, nov. sp. (2). 
and epistome strongly carinate, its margin not incised, cheeks one-fourth the eye-height, a faint suture present, palpi 
cylindrical, with abundant rather long black hair, upper part of thejhead brown, the upper bristles strong and interspersed 
with setulz ; third joint of the antennae onion-shaped, the apical process long, arista one-half longer than the antennze, thick 
at the base only. Six dorsocentral bristles, no acrostichals, no scutellar or lateral setulae except a couple on the humeri ; 
prosternum and metapleurae with numerous long yellow hairs. Abdomen with yellow lateral hairs and black discal setulae, 
epipygium small, the terminal keel short, lateral valves with long loose yellow hairs, upper valves shining black, with — — 
slender pointed converging end-processes. Front coxz with abundant yellow hair, legs black, front tibiz nearly as long as 
their femora, in both sexes the under side of the front femora densely and irregularly set with short thorn-like setulze, inter- 
spersed with stronger setze especially toward the apex, and basally with a few long yellow hairs also, inner side of the 
front tibiae uniformly and densely provided with minute setulze, posterior femora with a few strong flexor seta, and hind 
tibiz with a preapical bristle on each side, pulvilli small but the empodium large and white. Haiteres with black knob 
and reddish root; cilia of the calypteres very sparse and yellow. Wings long and narrow, with a brownish tinge, costal 
setulae moderate, no stigma, two submarginal cells, the second very narrow, discal cell blunt, two-thirds as long as the 
sessile second posterior cell, sections of the fifth vein 1 : 0.6, anal cótivuin rennen 
way to the margin. 
Thirty specimens; Beaverkill and Ithaca, New-York; Middletown, Connecticut; Mosehead Loa ies : from E. 
T. Cresson, Jr., C. W. Johnson, and O. A. Johannsen. Mr. Johnson states that the species swarmed over cut logs in a 
log-run on Mosehead Lake, so as to blacken the surface by their numbers. 
-(1) Wiedemannia (Chamaedipsia) ctenistes, nov. sp. — Male. Length 3mm. Closely related to Aamifera 
but differs as follows : face narrower, from the antennze to the center of the tubercle the face of the male is obviously longer 
than wide, the tubercle much less pronounced and located near the strongly notched oral margin, carina of the epistome not 
conspicuous, face of both sexes when viewed from in front uniformly white pruinose, except the tubercle, when viewed from 
below with a narrow dark median vitta, Palpi with finer hairs. Thorax witha traceof two vittr, End process of the dorsal 
valves of the epipygium nearly straight. The flexor setulz of the front femora of the male are s!ronger and uniformly 
arranged in a conspicuous single straight row along the basal three-fifths, beyond which occur four or five strong thorn-like . 
setae; in the female the setulze áre greatly reduced but still are seriately arranged, without interspersed strong setze; hind 
femora with about three preapical bristles. 
Five specimens, collected by C W. Johuson at Hanover, New Hampshire. Paratypes placed in the Boston Society 
of Natural History and in Mr. Johnson's collection. 
(2; Wiedemannia (Chamaedipsia) gubernans, nov. sp. — Male. Length3.5 mm. Olivaceous brown above, 
slaty below. Face dark cinereous, strongly tuberculate, lower margin carinate and entire, a fairly deep incision separating 
the cheeks, which measure about one-seventh the eye-height; palpi large, villose and with a few short dark hairs, sides of 
the proboscis likewise villose; third joint of the antennze spongy pubescent, short, onion-shaped, with a lengthened terminal 
process, the arista thick and blunt and slightly longer than the antenna; bristles of the upper half of the head strong, four 
pairs of postocellar setulas, Setulae present in the dorsocentral rows, no scutellar setulze, some posthumeral setulze present, 
metapleural hairs yellowish, pectus bare but the propleurz: with four or five setule, Epipygium with a long drawn-out 
keel, penis slender and brown, middle valves ovate, upper valves rather large, convex, opaque. Coxs with short sparse 
blackish hairs, legs black, front tibize seven-eighths as long as their femora, femora without setze, hind tibiae scarcely setulose, 
