212 
Basalt genital plates of female as broad as long (Fig. 64); penultimate 
segment before genital plates with a sharp lateral carina; male hypo- 
pyeial-plate asin Miewre 59s cei cies tec eae) were nee eee tele lateralis. 
Pale border of wing broadened near base, the pale margin very noticeably 
punctate; hypopygial plate as in Figure 61; dorsum of pronotum with 
large closely placed punctures on entire disc (Neb., Col., Ut., Wyo., Cal., 
"Wises ATIUZ2)! altecas ste stous sto ruvorcrath eseven anh oleae teres erect cps naTensett: Cae U Reena montana. 
Smaller species, rarely over 3 mm. in length; pale border of wing always 
broadened near base, apex of chitinized portion rounded. 
Anterior margin of pronotum as distinctly punctured as posterior portion 
of head; hypopygial plate of male (Fig. 60) narrow, slightly emargi- 
nate above, with an overhanging lip or flange on each lateral third, the 
central third of disc usually highly glossy and impunctate, seen from 
above the areas on each side of caudal opening are each as broad as 
the opening; female genital plates broader than long; anterior spirac- 
ular puncture just clear of margin on all segments of abdomen; scutel- 
lum usually a little pointed at apex..............0.00beveees pulicaria. 
Anterior margin of pronotum with the punctures very much smaller and 
weaker than those on posterior portion of head—subobsolete. 
Pronotum highly polished, the punctures almost obsolete; hypopygial 
plate of male similar to that of harti, but the central elevation of 
upper margin is less developed and the disc is closely punctured 
throughout; the whitish yellow mark on wing is‘broadly interrupted 
in center; tibiae almost black, the spinules on postero-dorsal surface 
OF hind “pair Strong). ses cidcincs occ wha eteie nc ahs Sud se erent ian ee interrupta. 
Pronotum not highly polished, microscopically shagreened, the punc- 
tures distinct but small, shallow, and closely placed on anterior 
third; hypopygial plate of male broadly emarginate above, with 
less evident lateral flange than in pulicaria; pale mark on wing com- 
plete, broader than in pulicaria; tibiae yellowish testaceous, the spin- 
ules on hind pair minute............ cee eee eee eee ee eee minutissima. 
Hind tibia without postero-dorsal spinules, rarely with minute setulae present; 
chitinized portion of wing acute at apex. 
Scutellum about as broad as long, without indication of a central impunc- 
tate longitudinal line; yellow margin of wing not extending mesad of 
cubital vein; anterior abdominal spiracular puncture mesad of lateral 
carina. 
Smaller species, averaging 2.5 mm. in length; hypopygial plate of male 
entirely black. 
Head almost angularly emarginate in front of eyes, more pronouncedly 
so in male (Pl. XX, Fig. 68); male hypopygial plate with broad cen- 
tral emargination; female genital plates broader than long...nanella. 
Head not almost angularly emarginate in front of eyes, slightly con- 
cave (Fig. 67); male hypopygial plate doubly emarginate (Pl. XIX, 
Fig. 58); female genital plates subtriangular (Fig. 66)...... - harti. 
Larger species, averaging from 3 to 4 mm. in length; hypopygial plate in 
male yellowish along upper margin, the outline broadly concave, with 
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