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 sj)ecies: 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 

 antenna! joint, cheeks one-fifth as broad as the eye height, eyes bare, 

 head at vibrissa^ much shorter than at base of antenna^, vibrissae 

 inserted on a line with front edge of the oral margin, one or two bris- 

 tles above each, antennie 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 vittie; three 

 postsutural and four sternopleural macrochjeta', scutellum bearing two 

 long marginal pairs; abdomen shining, the bases of the last three seg- 

 ments narrowly white pollinose, bearing only marginal macroclmetae; /p^i,-^Za 

 wings hyaline, first vein bearing two or three bristles toward the tip, -^-^^^ Ail^ 

 third vein bearing a single one at the base, hind crossvein nearly 

 straight, midway between the small and the bend, the latter obtuse, not 

 appeudiculate, apical cell open, terminating at the extreme wing tip; 

 calypteres white; last two joints of front tarsi of female dilated, the 

 claws and j)ulvilli 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 tibia^, each bearing a single bristle on the front side 

 near the middle, hind tibiiie not ciliate; length, 4 to 5 mm. District of 

 Columbia, and Kirkwood, Mo. Five males and one female bred from 

 Melissojms laiiferreana Wlsm. by Miss Mary E. Murtfeldt and this Divi- 

 sion. Type jSTo. 3541, U. S. National Museum melissopodis u. sp. 



Genus LISPIDEA Coq. 



Lispidea Coqiiillett, Journal N. Y. Eat. Soc, Vol. Ill, p. 51; June, 189.5. 



Our single si:)ecies is black, with j'ellow palpi; three postsutural and 

 two sternopleural macrocha^a"; 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. 

 Herbstid DesA'oidy, Annales Soc. Ent. France, p. 184; 1851. {Xon Edwards; 1834.) 



This synonymy is given by Eondani ' and repeated by Schiner;* 



^^ 



' Dipterologi:!' Italica- Prodronins, Vol. Ill, j). 12; 1859. 

 -Fauna Austriaca, Vol. I, p. 517; 1862. 



