1977] 
Porter — Mesostenines 
53 
narrow and well-defined area-basalis (broadly and poorly devel- 
oped in univittata), and black and white (instead of uniformly tes- 
taceous) gaster. 
B. bicarinata (Cushman) from Panama may be separated from 
texana by its color (ferruginous with head black) and by many 
structural features (clypeus not prominent in profile, occipital Ca- 
rina separated by a deep groove from hypostomal carina, temple 
concave in dorsal view, mesopleuron finely and sparsely punctate, 
subalarum reduced to a carina, and propodeum sparsely punctate 
with its apical trans-carina forming medially an acute angle from 
which a single carina extends forward to the basal trans-carina). 
Cameron’s (1885, p. 236) original diagnosis of B. ehontalensis, 
the only other described Middle American Bicristella, shows that 
his species has a short frontal horn (horn is long in texana) and 
that it deviates chromatically from texana in numerous aspects 
(mandible black at base, mesoscutum with a yellow line along outer 
edge of central lobe and without a white callus opposite tegula, 
lower metapleuron with a black mark over hind coxa, petiole black 
at base, and fore and mid coxae with a black line at base and a 
larger black spot at apex, and hind coxa marked with yellow). 
The Cuban B. tricolor (Brulle) resembles texana because its oc- 
cipital carina is complete ventrad to the hypostomal carina and the 
mesopleuron is discally striate but may be distinguished because it 
has two deep pits at the base of the frontal horn, the anterio-lateral 
margin of the pronotum sharply angulate below the middle, the 
scape below and apex of the frontal horn white, the mesoscutum 
with discal white lines that extend nearly the length of the inner 
margins of the lateral lobes, and the legs mostly ferruginous. 
Finally, B. testacea (Taschenberg), the only other described Bi- 
cristella, ranges over most of South America and differs strikingly 
from the black, white and testaceous texana in being uniformly 
ferruginous to testaceous with only the head black. 
FIELD NOTES: Swept near R. Grande from Serjania vines in 
Salix-Celtis-Fraxinus gallery woods. 
SPECIFIC NAME: for the state of Texas. 
Genus Diapetimorpha 
The Valley has seven Diapetimorpha, of which three are de- 
scribed as new. 
