502 PROCEEDINGS OF THE ACADEMY OF [Oct., 
group of about twenty long pale hairs on the caudal margin of the 
mesepimeron just cephalad of the halteres. Halteres pale yellow 
throughout, the knobs large. Legs with the coxae and trochanters 
brown; femora dark brown; tibiae and tarsi, especially the terminal 
segments of the latter, paler brown. Wings subhyaline, the stigma 
indistinct; veins brown. Venation (Plate XXVII, fig. 34). 
Abdominal tergites one and two dark brown, three to eight dark 
brown, broadly margined caudally and more narrowly on the sides 
with pale yellowish white, giving the organ a banded appearance; 
pleural integument pale; sternites similar to the tergites, but paler 
brown. Male hypopygium (Plate XXXI, fig. 97) with the pleurites 
short and stout, the pleural appendages a dorsal cylindrical fleshy 
lobe and a more ventral acute chitinized point with a smaller chitin- 
ized lobe on its ventral face; ninth tergite concave on the caudal 
margin, underneath with two stout, chitinized lobes that are 
decussate. 
The female has the tergal valves of the ovipositor long, strongly 
upcurved, chitinized, brown; sternal valves short, pale, acutely 
pointed. 
Habitat. — Western United States. 
Holotype, cf. Blue Lake, Humboldt County, California, June 
20-27, 1907 (Bradley). 
Allotype, 9 , with the type. 
Paratopotypes, 4 d^'s. 
Type in the collection of Cornell LTniversity. 
Erioptera (Mesocyphona) tantilla sp. n. 
Vertex unicolorous; mesonotum brown with three narrow blackish 
stripes; femora pale Avith a narrow, indistinct, subterminal band; 
costal region of the wings dark with tiny spots at the ends of Sc, 
Ri, Rn and R^; caudal cells of the wings with gray spots; cell 1st M2 
closed. 
Male. — Length, 4.5 mm.; wing, 3.6 mm. 
Rostrum and palpi light brown. Antennae reddish yellow, the 
fiagellum a little more brownish ; flagellar segments very slender with 
elongate verticils. Head brownish yellow without distinct markings, 
the vertex with numerous long hairs. 
Mesonotal priescutum light brownish gray medially, more >'ellowish 
laterally, the central portion delimited on either side by an indistinct 
narrow brown line; a still darker narrow brown median line, inter- 
rupted at the level of the tuberculate pits; scutum with the lobes pale 
indistinctly marked with brown; an oblique row of about seven 
