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 vibrissa 1 much shorter than at base of antenme, vibrissas 
inserted on a line with front edge of the oral margiu, one or two bris- 
tles above each, antenme 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 vittae; three 
postsutural and four sternopleural macrochaetae, scutellum bearing two 
long marginal pairs; abdomen shining, the bases of the last three seg- 
ments narrowly white pollinose, bearing only marginal macrochaetae ; 
wings hyaline, first vein bearing two or three bristles toward the tip, 
third vein bearing a single one at the base, hind cross vein 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 
claws and pulvilli scarcely one-third as long as the last tarsal joint, 
front tarsi of male not dilated, the pulvilli slightly longer than the last 
tarsal joint, middle tibiae each bearing a single bristle on the front side 
near the middle, hind tibias not ciliate; length, 4 to 5 mm. District of 
Columbia, and Kirkwood, Mo. Five males and one female bred from 
Melissojms latiferreana Wlsm. by Miss Mary E. Murtfeldt and this Divi- 
sion. Type Xo. 3541, U. S. National Museum melissopodis n. sp. 
Genus LISPIDEA Coq. 
Lispidca Coqnillett, Journal X. Y. Ent. Soc, Vol. Ill, p. 51; June, 1895. 
Our single species is black, with yellow palpi; three postsutural and 
two sternopleural macrochaetae; length 4 to 5 mm. Canada and north- 
ern Illinois. (Loc. cit, p. 52.) palpigera Coq. 
Genus THRYPTOCERA Macq. 
Thryptocera Macquart, Histoire Nat. Insectes, Dipteres, Vol. II, p. 87; 1835. 
Herbstia Desvoidy, Annales Soc. Ent. France, p. 184; 1851. (Xon Edwards; 1834.) 
This synonymy is given by Eondani ] and repeated by Schiner; 2 
1 Dipterologia- Italica- Prodroraus, Vol. Ill, p. 12; 1859. 
-Fauna Austriaca, Vol. I, p. 517; 1862. 
