57 
Genus PLECTOPS, new genus. 
The characters of this genus may be gleaned from the table of genera 
given on a previous page and from the following description of the 
type species: Black, the palpi and apex of proboscis yellow; front in 
both sexes one and one-fourth times as wide as either eye, two pairs of 
orbital bristles, frontal bristles descending almost to apex of second 
antennal joint, cheeks one-fifth as broad as the eye height, eyes bare, 
head at vibrisse much shorter than at base of antenni, vibrisse 
inserted on a line with front edge of the oral margin, one or two bris- 
tles above each, antenne as long as the face, the third joint in the male 
three-fifths, in the female two-fifths, as broad as long, five times as long 
as the second, arista bare, thickened on the basal two-thirds, the penul- 
timate joint four times as long as broad, almost one-half as long as the 
last joint; thorax gray pollinose, marked with four black vitte; three 
postsutural and four sternopleural macrochietie, scutellum bearing two 
long marginal pairs; abdomen shining, the bases of the last three seg- 
ments narrowly white pollinose, bearing only marginal macrochiete ; 
wings hyaline, first vein bearing two or three bristles toward the tip, 
third vein bearing a single one at the base, hind crossvein nearly 
straight, midway between the small and the bend, the latter obtuse, not 
appendiculate, apical cell open, terminating at the extreme wing tip; 
calypteres white; last two joints of front tarsi of female dilated, the 
elaws and pulvilli scarcely one-third as long as the last tarsal joint, 
front tarsi of male not dilated, the pulviili slightly longer than the last 
tarsal joint, middle tibiw each bearing a single bristle on the front side 
near the middle, hind tibizw not ciliate; length, 4 to5 mm. District of 
Columbia, and Kirkwood, Mo. Five males and one female bred from 
Melissopus latiferreana W1sm. by Miss Mary E. Murtfeldt and this Divi- 
sion. Type No. 3541, U.S. National Museum...... melissopodis i. sp. 
Genus LISPIDEA Cog. 
Lispidea Coquillett, Journal N. Y. Ent. Soc., Vol. III, p. 51; June, 1895. 
Our single species is black, with yellow palpi; three postsutural and 
two sternopleural macrochete; length 4 to5mm. Canada and north- 
PEUTIC IStae (UOC Cliticy D2. inc 3.2 ft as sad < cos ass aes aw palpigera Coq. 
Genus THRYPTOCERA Macq. 
Thryptocera Macquart, Histoire Nat. Inseetes, Dipteres, Vol. II, p. 87; 1835. 
Herbstia Desvoidy, Annales Soc. Ent. France, p. 184; 1851. (Non Edwards; 1834.) 
This synonymy is given by Rondani! and repeated by Schiner;? 
! Dipterologixe Italiczee Prodromus, Vol. III, p. 12; 1859. 
?Fauna Austriaca, Vol. I, p. 517; 1862. 
