349 
Thorax without any bristles between the posterior pair of dorsocentrals; 
OcCelMAaTrehrishlessaADSEN tis oa cievelals che wierctaleletels Mielare Gale! elevejecate Leucopis Meigen 
Geel pPristlestapSents..ccte sic ects viele o> siecle e's e's Leucopomyia, subgen. n. 
Ocellar bristles present (Pl. XLVI, Fig. 8).......... Neoleucopis, subgen. n. 
Leucoris Meigen, sens. str. 
Kery TO SPECIES 
Third antennal segment yellow; thorax and abdomen without black or 
brown stripes or spots, basal segment of the latter blackened except 
GU SPOSLELION MALE IN ani.) inc sichesicls cies sfarere erais e¥a.ai sie 7 flavicornis Aldrich 
mhindsantennale seement iplackseycrac casters ore dels tele cle stelelaicrersls RT 2 
Basal two antennal segments yellow, contrasting conspicuously with the 
black third segment; mesonotum without distinct vittae, usually with 
4 pairs of weak dorsocentrals; legs yellow, femora darkened in middle.. 
CASddacoconcolnooo abode pondodisoodniaancoinadioanigdddondn pemphigae, sp. Nn. 
Basal two antennal segments not conspicuously paler than third; species 
DOLCE SDECLSmUO Lh cau OON Clan acalote savas ieze falase )s: «si <n im ejelteretay'es atstace sare le:= le 3 
Frontal lunule transverse on its upper margin; thorax and abdomen dark 
gray, thorax not vittate, and with four series of acrostichal setulae be- 
tween the dorsocentrals, abdomen with basal tergite almost entirely 
and the second largely fuscous, slightly shining; last section of fourth 
vein five or six times as long as preceding section; last section of fifth 
vein almost or quite twice as long as outer cross-vein; male hypopygium 
with a very long curved central process................ piniperda, sp. n. 
Frontal lunule.arcuate on upper margin, almost transverse in simpler; 
thorax with more than four series of acrostichal setulae between dorso- 
centrals; male hypopygium without a long curved central process....4 
Abdomen with a small central spot and a larger one on each side of it on 
each of segments two to four inclusive black............-e eee ee eee e eens 5 
Abdomen with or without a small black central spot on segments two to 
four inclusive, but without the lateral spots except on second segment. .6 
Thorax with two brown vittae....... ROYER R halos wiehai Gi vitae here “ayer ess bellula Williston 
SRN OTOH OUREVIUUAGE)valaieetetetntelateratetel siateraiekesaliets iefelntaas e\cieee 6 maculata Thompson 
Frontal orbits.well differentiated from interfrontalia, each orbit wider 
than the latter, the entire frons pale gray, not vittate; genal bristle 
long; wing-veins 3 and 4 parallel apically, not convergent; tibiae and 
tarsi yellowish, the former slightly darkened in middle...orbitalis, sp. n. 
Frontal orbits poorly defined, not at all differentiated from interfrontalia, 
and not as wide as the latter, the frons usually distinctly vittate....... 7 
