1977] 
Porter — Mesostenines 
33 
1 . Gambrus bituminosus Cushman 
SPECIMENS EXAMINED: 1 female, Bentsen Park, 31 XII 76. 
HABITAT: Weeds in sandy area at edge of field not far from Rio 
Grande. 
DISTRIBUTION: Mass., N.Y., N.J., 111., Minn., Ga., La., Cal., new 
for Texas. 
PHAENOLOGY: Summer in north, winter in south. 
2. Gambrus ultimus (Cresson) 
SPECIMENS EXAMINED: 6 females, 2 males: BENTSEN PARK (Net: 
2 females, 13 I 76; 1 female, 19 I 76; 1 female, 29 XII 76; Malaise: 
1 male, 16 X 76); BOTANICAL GARDEN (Net: 1 female, 12-21 I 76; 
1 female, 17-24 III 74; 1 male, 18 III 74). 
HABITAT: Serjania vine tangles under shade of Celtis lindheimeri 
and other large trees. 
DISTRIBUTION: Continental U.S. 
PHAENOLOGY: Flies in Valley from October to March with peak 
in January (4 of 8 collections). Active in north from April to 
October. 
3. Trychosis subgracilis (Cresson) 
SPECIMENS EXAMINED: 1 female, 2 males: bentsen park (Net: 
1 female, 23 I 76; Malaise: 2 males, 15-30 IV 76). 
HABITAT: Serjania vines in gallery woods beneath Celtis lind- 
heimeri and Salix nigra; entered trap beneath Pithecellobium flexi- 
caule. 
DISTRIBUTION: Eastern U.S.; first record for Valley. 
PHAENOLOGY: January to April in Valley; April to August in 
northern states. 
4. Trachysphyrus mesorufus (Cushman) 
(Fig. 6) 
FEMALE: Color: scape black with a broad, nearly percurrent 
white bar below and brown on dorsal rim; pedicel black; flagel- 
lum black with a ventrally incomplete white band on segments 
5-11; head and mesosoma black with white markings as follows: 
basal 2/3 of the otherwise somewhat brownish mandibles; blotch 
covering most of clypeus; most of face except for a large area be- 
