222 A. L. MELANDER. 



Platypalpus Iateralii« Loew. 

 Cent. V, 78. 



Black, shining. Head subopaque, cinereous. Antennae black, third joint 



short, lanceolate, yellow basally. Proboscis black, palpi black. Sides of thorax 



and greater part of pleurte opaque white pollinose. Abdomen shining black. 



Legs including coxae yellow;- tarsi annulate basally, fuscous or black apically, 



apical spur of the middle tibiae small. Wings hyaline, veins fuscous, third and 



fourth subparallel, basal cells equal, sixth vein whole. 2.5 mm. 



New Hampshire (Osten Sacken). 



Platypalpus discifer Loew. 

 Cent, iii, 36. 



Black, shining, dorsum of thorax, scutelluni and nietanotum with luteous pol- 

 len, occiput and pleurae with opaque white pollen. Antennae ochraceous, black 

 at tip. Palpi and legs yellow. Anterior tarsi of male white, and closely white 

 pubescent, middle tarsi of male black, first joint depressed ; posterior tarsi of 

 male and all the tarsi of the female black apically. Wings subinfuscated, base 

 of costa and first longitudinal lutescent, rest of veins strong, dark fuscous, third 

 and foui'th veins convergent, anal cell complete. 2.6 mm. 



District of Columbia (Osten Sacken). 



Flatypalpus hastitattis sp. nov. (Fig. 30). 

 Black, head and thorax dusted with olive-green tonientum. Face narrow, 

 white dusted, the dust with a slight yellowish shade. Antennae piceous to black, 

 third joint broad, one and one-half times as long as deep, it height equalling the 

 length of the first joint, arista shorter than antenna. Palpi small, whitish in the 

 male, yellowish red or fuscous in the female. Proboscis black, a little shorter 

 than height of head. Lower part of occiput and of pleuraj slaty-gray pollinose. 

 Scutellum with two long apical yellow bristles. Halteres whitish, broad. Abdo- 

 men black, shining, with sparse, short, light-colored hairs ; hypopygium shining, 

 flexed to the left, large; genital styles of the female fuscous; venter shining. 

 Legs including coxae yellow, tarsal joints slightly dusky apically; front coxae 

 with coating of white hairs anteriorly; femora not greatly thickened, middle 

 ones largest, hind femora not thickened ; spur of middle tibiae moderate. Wings 

 clear, veins light yellow, third and fourth longitudinals nearly straight, subpar- 

 allel, second basal cell the longer, its outer vein oblique, anal cell open behind, 

 sometimes wanting. 2-2.5 mm. 



Four males and six females ; Lawrence, Kansas. One female 

 from Craig's Mountain, Idaho. 



Plafypalpiis seqnalis Loew. 



Cent. V, 75. 



Black, shining. Dorsum of thorax with cinereous pollen, pleurae largely 

 opaque white. Legs and coxae yellow, tarsi yellow. Antennae black, third joint 

 lanceolate. Palpi testaceous. Basal cells of wing equal, sixth vein not abbrevi- 

 ated at base, third vein very slightly incurved at apex, subparallel with the 

 fourth. 2.5 mm. 



Illinois (Le Baron), 



