VOL. 54, NO. 1, JANUARY 1978 
33 
Akorhexoza eactiwra, new species 
Male.—About 2.00 mm long; color dark grey brown, membrane pale; head and thorax 
shining, abdomen dull (specimens all slide mounted). Antennal flagellomeres with a 
single whorl of about 13 short, stout setae in addition to campaniform sensilla and micro- 
trichia; maxillary palpi large, 0.16 mm long; labella slender but nearly as long as palpi; 
rostrum long; cardostipites conspicuous with 11-17 setae on each side; occiput sparsely 
setose with vertex more densely setose. Supraalar setae 15; preepisternals 10-11; 
anepisternals 22-23; upper episternals 8; subalars 7-9; subspiraculars 6-9 (2 large); lower 
epimerals 1-5; pedicellars 3. Wings 1.75-1.90 mm long; R, and R 3 with dorsal setae only; R., 
terminates before middle of wing; section 2 of costa scarcely longer than R,; membrane 
microtrichiose. Abdominal tergites 2-7 conspicuous, rectangular, wider than long, 
sparsely setose; tergum 1 anteriorly emarginate, short; tergum 8 (Fig. 3) dark, heavily 
sclerotized, produced posteriorly in atuncate process; tergum 7 (Fig. 2) large, longer than 
preceding and deeply emarginate posteriorly; sterna 1-4 unsclerotized, 5 and 6 small, 
triangular; sternum 7 (Fig. 2) large, deeply emarginate posteriorly, a strong tooth-like 
process on each side of emargination; no evident sternum 8. Genitalia (Fig. 1) very like 
that of dampfi except penis valves less conspicuous, with fewer setae; median process 
(gonocoxites) with a regular row of long setae on each side ventrally. 
Female.—Size and coloration as in male. Maxillary palpi 0.15 mm long; cardo-stipites 
with 12-17 setae on each side; supraalar setae 13-15; preepisternals 6-10; anepisternals IQ- 
23; upper episternals 6; subalars 6-8; subspiraculars 5-6 (2 large); lower epimerals 2-4; 
pedicellars 3. Wings as in male, 1.70 mm long; abdominal terga 1-6 as in male; sterna 1-6 
unsclerotized; sternum 7 sclerotized; all sclerites sparsely setose, setae small, tergum 8 
small, with a few setae and microtrichia laterally, mesally bare. Cerci small, setose and 
microtrichiose. Genitalia (Fig. 4) with a pair of apically acute valvifers fused with sternum 
8; very distinct from terminalia of 9 dampfi. 
Holotype d. N. San Miguel de Allende, Guanajuato, Mexico. 4-VIII-1966, reared ex 
Ferrocactus. In collection of University of Minnesota. Paratypes: 1 9 same date as 
holotype, in University of Minnesota collection; 1 d, 1 9, Teotihuacan pyramid to the sun, 
Mexico. 27-XI1-1970, (P.H. & M. Arnaud), at flowers of Cassia tomentosa L.f. [sic] in 
collection of California Academy of Sciences. 
Psectrosciara arnaudi, new species 
Male.—Total length 2.5 mm. Color dark blackish brown; head and thorax shining, 
abdomen dull; legs unicolorous with body except hind femora somewhat darker; halteres 
brown. Maxillary palpi 0.112 mm long; labella small, 0.15 mm; rostrum short; no evident 
cardo-stipites; gular area partially sclerotized, bearing some setae; head capsule 
posterior to eyes with short setae and at least 3 pairs of campaniform sensilla on lower 
half; antennae 10-segmented, with numerous short setae. Supraalar setal row not 
particularly distinct, about 6-7 setae in this position; upper episternals 7; anepisternals 
24; preepisternals 40+ ; subalars 12; subspiraculars 8; lower epimerals 0. Wings pale 
brown, beset with microtrichia; setae on veins and membrane behind M 2 ; veins con¬ 
spicuous, Ri and R 2 darker than those posteriorly; M, scarcely connected to M 2 at base. 
Genitalia (Fig. 5) similar to those of P. oregonensis Cook; dorsal process small, detached 
from tergum 8. 
Female. — Unknown. 
Holotype d Mexico, Baja California, 22 miles S. San Vincente, 300 ft., 6 April 1969. 
(Stanley C. Williams). In collection of California Academy of Sciences. 
