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 coxse 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 cf 's. 



Type in the collection of Cornell University. 



Erioptera (Mesocyphona) tantilla sp. n. 



Vertex unicolorous; mesonotum brown with three narrow blackish 

 stripes; femora pale with a narrow, indistinct, subterminal band; 

 costal region of the wings dark with tiny spots at the ends of Sc, 

 Rx, R 2 and R 3 ; caudal cells of the wings with gray spots; cell 1st M 2 

 closed. 



Male. — Length, 4.5 mm.; wing, 3.6 mm. 



Rostrum and palpi light brown. Antennae reddish yellow, the 

 flagellum a little more brownish ; flagellar segments very slender with 

 elongate verticils. Head brownish yellow without distinct markings, 

 the vertex with numerous long hairs. 



Mesonotal praescutum light brownish gray medially, more yellowish 

 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 



