NORTH AMERICAN JHRTERA. 
359 
oval, hardly vaulted, black, shiniug, covered with short depressed black bristles, 
covered with short depressed black bristles, first segment a little shortened, 
second to fourth segments faintly rather broadly silvery at base; macrochselie 
rather stout and abundant, first segment with a median marginal pair, and one 
lateral marginal macrochgeta; second segment with a median discal and marginal 
pair, and a lateral marginal one; third segment with a median discal and mar- 
ginal pair, a lateral marginal pair each side, several marginal on venter, and 
some shorter subdiscal and discal ones on sides; fourth segment well armed 
with discal, snbdiscal and marginal macrocluetie. Legs moderately long, black, 
faintly cinereous or silvery; femora a little, tibiae strongly bristly, especially 
middle and hind pairs. Claws and pulvilli elongate. Wings but little longer 
than the abdomen, without costal spine, grayish hyaline, extreme base and veins 
slightly flavous ; apical cell ending before tip of wing, closed in border; fourth 
vein bent at an angle, without stump or wrinkle ; hind cross-vein nearly straight, 
oblique, a very little approximated to the bend of the fourth vein ; tegulse nearly 
white, halteres fu.scous. Length 6 mm, ; of wing 4.5 mm. 
Described from one specimen received from i\Ir. Chas. Robertson, 
Carlinville, 111. This belongs in the subgenus Ceromasia Roud. and 
is very near 31. luctuosa v. d. Widp. But it is more black, very 
faintly cinereous, and the apical cross- vein is distinctly curved or 
bowed. 
itiasicera sordicolor n. sp. 'J, . — Cinereous. Head, thorax and abdomen 
nearly equal in width. Eyes brown, bare ; front at vertex about one-fourth widtli 
of head, widening before, prominent, face much wider ; frontal vitta black, nearly 
equal in width, enclosing the ocelli ; frontal bristles descending about to base of 
third antennal joint, a strong one at each vertical angle, all the rest except two 
last ones directed inward and mostly decus.sate ; no orbital bristles; a very few 
scattered fine hairs outside the frontal rows; twm pairs of ocellar bristles, the 
forward pair directed inward and forward, decussate; face, cheeks and sides of 
front silvery-cinereous; sides of face moderately narrow, bare; face oblique, 
receding, facial depression moderately wide, facial ridges bare, except a few 
bristles just above the vibrissse, which latter are decussate and inserted very 
much above the oral margin; cheeks slightly invaded by occipital area, black- 
hairy below posteriorly, with bristles on lower and forward margins ; antenna; 
considerably shorter than the face, narrow, brownish, third joint slightly yel- 
lowish at base, second joint bristly before, first joint very short, second a little 
elongate, third about twice as long as second ; arista blackish or brownish, thick- 
ened on its basal two-sevenths, microscopically pubescent, apparently 2-jointed. 
basal joint not elongate, proboscis moderately stout, brownish, labella well de- 
veloped (proboscis not extended in this specimen), palpi orange-yellow, club- 
shaped, thickened at tip, black-bristly above and below; occiput cinereous, 
slightly gray hairy near center, black-hairy outside with a fringe of black hairs 
on orbital margins. Thorax, scutellum, humeri and pleurae cinereous, hairy and 
bristly ; thorax with four moderately narrow, dark vittae, the outside pair obso- 
lete in front and interrupted at the suture; scutellum with an apical, nearly 
straight pair of macrochaette, three shorter lateral ones on each side, and one at 
forward angle. Abdomen conico-ovate, somewhat flattened, entirely cinereous, 
covered vvith short black hairs, first segment considerably shortened, macrochaeta' 
