1977] 
Porter — Mesostenines 
61 
with tarsus blackish with dull white on base of first segment and 
pure white on apical 1/3 of first segment and on all of segments 
2-4; wings hyaline with stigma brownish. 
Length of fore wing: 3. 5-3. 6 mm. Flagellum: tyloids not clearly 
defined; first flagellomere 4. 1-4.5 as long as deep at apex. Clypeus: 
moderately convex. Malar space: 0.55-0.65 as long as basal width 
of mandible. Temple: 0.47-0.52 as long as eye at upper 1/3. Pro- 
notum: scrobe smooth, without wrinkles except for short epomia 
or sometimes with several oblique wrinkles in addition to epomia. 
Mesoscutum: smooth and polished with numerous, well spaced 
small punctures that become somewhat larger and denser anteriad. 
Mesopleuron: smooth and polished with small, scattered punctures 
and only a little longitudinal wrinkling limited to dorsal region 
behind subalarum. Lower metapleuron: smooth and polished with 
scattered small, weak punctures that become only a little larger and 
denser dorsad toward pleural carina; juxta-coxal carina defined for 
a short distance near base. Propodeum: basal trans-carina only 
weakly curved forward medially; apical trans-carina complete, ad- 
vanced far forward medially, its cristae scarcely raised; surface 
smooth and polished basad of basal trans-carina, moderately 
wrinkled apicad of apical trans-carina. First gastric segment: post- 
petiole 0.84 as wide apically as long from spiracle to apex. 
TYPES: The holotype is in the collection of Henry K. Townes, 
5950 Warren Rd., Ann Arbor, Michigan. One male paratype has 
been donated to the Florida State Arthropod Collection (Division 
of Plant Industry, Entomology Bureau, Florida Department of 
Agriculture, Gainesville, Florida, 32602) and a male and female 
paratype are retained in the author’s personal collection (301 N. 
39th Street, McAllen, Texas, 78501). 
RELATIONSHIPS: This species is close to D. macula but may be 
easily distinguished by the structural and chromatic characters given 
in the key. 
FIELD NOTES: Sphenos has been collected only by Malaise Trap 
and appeared at both the Bentsen Park and Botanical Garden col- 
lecting stations. It is thus a species of shady woods, associated 
with large trees such as Pithecellobium flexicaule and Celtis lind- 
heimeri. 
Sphenos may have separate fall and spring generations, as there 
are records for October and November and again for May. 
