508 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 95 
teeth on dorsal margin near apex. Pregenital sternite with hind 
margin slightly excavated medially. 
Described from one male and one female collected by the writer on 
the Lalaja road, Northern Range, Trinidad, B. W. I. (May 29, 1936), 
at 2,500 feet in forest. Holotype male in B.M.N.H.; allotype fe- 
male, U.S.N.M. No. 56752. This species is distinguished by the shape 
of the male genitalia and by the color pattern. 
THIONIA MAMMIFERA, new species 
PLATE 17, FIGURES 535-543 
Female: Length, 6.0 mm.; tegmen, 6.5 mm. 
Vertex broader than long (2:1), depressed, median carina feebly 
present; frons as broad as long in middle, median carina present, 
weak apically, lateral carinae obsolete. Hind tibiae with two spines 
before apex. Abdomen with a pair of papillate protuberances near 
middle line ventrally on sixth segment. 
Testaceous-fuscous; vertex testaceous, an oblique pale fuscous band 
from middle line at apex to each lateral basal angle, frons mottled 
fuscous, clypeus testaceous banded fuscous, genae testaceous, a fuscous 
spot between ocelli and antennae; pronotum testaceous, a fuscous 
suffusion in middle of lateral lobes, mesonotum fuscous to piceous, 
carinae paler; legs and abdomen testaceous; tegmina brownish yel- 
low, a pallid spot between M and Cu, level with R fork, the transverse 
veins and the apex of the external claval vein broadly pallid, a few 
small pale spots between claval veins near base; eyes red, with a 
pale crescentic band horizontally. 
Anal segment short, postanal portion in dorsal view tapering, 
truncate at apex. QOvipositor with lateral styles broad at base, both 
margins convex, tapering subequally to a membranous lip at truncate 
apex; first valvulae broad, with two small subapical teeth and one 
larger flattened tooth at apex dorsally. Pregenital sternite with 
posterior margin sinuate, shallowly excavated medially, with a slight 
median groove basad of hind margin. 
Egg bluntly fusiform, 0.9 mm. long, 0.5 mm. wide, with the sur- 
face finely reticulate. ait 
Described from two females collected in Trinidad, B. W. L., by 
F. W. Urich (1923). Type, U.S.N.M. No. 56713. The writer has de- 
scribed this species, although no males were available, on account 
of the distinguishing characters of the singly banded eyes and the 
abdominal ventral protuberances. 
THIONIA BUFO, new species 
PLATE 17, Ficures 544—554 
Male: Length, 6.5 mm.; tegmen, 5.6 mm. Female: Length, 7.1 
mm.; tegmen, 5.9 mm. 
