20. 
21. 
22. 
24. 
25. 
26. 
27. 
28. 
TWO GENERA OF TRYPETIDAE—MALLOCH 5 
Scutellum with four bristles, the apical pair much shorter than the basal_ 21 
Scutellum with but one pair of strong bristles, the short apical pair 
Teel ees. “op a ie ee ee 22 
Two of the dark rays across the apical half of the discal cell of the 
wing extending over the fifth vein, the outer one reaching the wing 
ATVEDES UT ye (ELT a Ch) erent es ee cee Wh eugenia (van der Wulp) 
One dark ray across the apical third of the discal cell of the wing ex- 
tending to the wing margin (fig. 1, 6) -_--_-------- stigmatica (Coquillett) 
The preapical starlike mark on the wing extremely pale and faint, 
yellowish, centrally, only the tips of the rays in the wing margin 
Feagily visible (is ssl70))s = =e ee eee eee erasa, new species 
The preapical starlike mark on the wing black or blackish brown and 
CONSPI CUO Sy eee ae ee oe nee ee ee 23 
. A broad black band extending from the costal margin of the stigma, 
almost or entirely filling the stigma, obliquely downward and back- 
ward to connect with the large preapical black mark and enclosing 
CHORIN T Wi CLOGS i vel t le eens een nee ee Sey See ete ee ee LS eee 24 
At most a slender diagonal black or dark brown ray extending from the 
eostal margin of the:stigma, not filling the latter, to the large pre- 
apical black mark, and connecting with it at the inner cross vein, 
Sometimes nordiagonaly ray, presents 2-2) - = = eee 25 
Third antennal segment not darker than the basal two. 
bisetosa (Coquillett) 
Third antennal segment distinctly darker than the basal two. 
nigricornis (Coquillett) 
Two dark rays or fasciae through the apical half of the discal cell of 
the wing in front of the one enclosing the outer cross vein extending 
well over the fifth vein, the outer one to the wing margin (fig. 1, v). 
arizonensis, new species 
At most only one dark fascia in the apical half of the discal ceil of 
Wine extending OVverstne enti he Vel e2 260 = ase eee 26 
The dark fascia or ray through the discal cell nearest to the outer 
cross vein extending over the fifth vein to the wing margin (fig. 1, ¢). 
dacetoptera Phillips 
No dark ray through the discal cell extending to the margin of the wing_ 27 
A complete narrow black diagonal ray extending from the costal margin 
Olineustiomastor che Imner cross Velna ==" == see eee eee 28 
A partial or broken dark ray extending over part of the course between 
the stigma and the inner cross vein, or no ray present, when almost 
entire it may be broken only in the stigma or in the cell below it_-___ 35 
Two dark subequal rays in the apical half of the discal cell of the 
wing, the inner one sometimes broken and represented by a dark 
Spoblonwthe fhittheveina(he.so07)) 22 See texana, new species 
One dark ray through the apical third of the discal cell, sometimes 
a short stump of an anterior one against the fourth vein close to 
the inner cross vein, the dark dot when present close to middle of 
the discal cell, or the fifth vein with an elongate dark border on 
COMET ATM TOOT MOnee se a ee ne Seen ee ES ee 29 
. The hyaline mark near the base of the first posterior cell of the wing 
and directly above the outer cross vein subquadrate, extending en- 
tirely;acrossuthe cell (ie) ds Wy ee ee imperfecta (Coquillett) 
The hyaline mark near base of the first posterior cell of the wing 
almost directly above the outer cross vein not extending entirely 
across the cell and more or less definitely rounded above____----- = 30 
