24. MISC. PUBLICATION 241, U. S. DEPT. OF AGRICULTURE 
middle; second and third tergites combined a little longer than combined length 
of following tergites; ovipositor sheaths nearly as long as the first tergite. 
Head testaceous with a piceous spot enclosing ocelli; thorax testaceous with 
the dorsum blackish or piceous; first abdominal tergite blackish, the following 
mostly yellowish, the apical tergites more or less piceous; legs entirely yellow 
except tarsi, which are somewhat dusky; wings hyaline; stigma yellowish hyaline, 
margined with brown; radius and metacarpus brown; other veins paler. 
Type locality —Langdale, Chambers Co., Ala. 
Type.—United States National Museum no. 49912. 
Described from a single female specimen collected by H. H. Smith. 
(2) SYNTRETUS VIGILAX (Provancher), new combination 
(Figs. 1, H; 2, @) 
Gamosecus vigilax Provancher, Nat. Canad. 12: 167, 1880. 
Microctonus vigilax Provancher, Additions et Corrections au Volume II de la 
Faune Entomologique du Canada traitant des Hyménoptéres, 1888, p. 379. 
Type.—tIn the Provincial Museum, Quebec, Canada. 
Length 3to4mm. Head in front view subquadrate, a little broader than long; 
eyes small; malar space at least half as long as eye in female, three-fourths as 
long as eye in male; face broad, finely rugulose or punctate; clypeus unusually 
broad, convex, wrinkled; mandibles very long; temples at least as broad as eyes, 
convex; frons with a fine median impressed line below median ocellus; antennae 
about as long as head and thorax combined, usually with 18 to 23 segments, the 
first flagellar segment much longer than any of the following, most of which are 
hardly longer than broad. Mesoscutum usually shallowly punctate anteriorly, 
polished posteriorly; propodeum deeply and broadly longitudinally excavated, 
the excavation forming a large pentagonal area, which extends from near extreme 
base of propodeum to its apex and is margined by carinae; mesopleurum without 
a furrow; stigma very broad; metacarpus lacking; radius arising from beyond 
middle of stigma; second abscissa of radius very weak. Abdomen in its widest 
part nearly as broad as thorax; first segment longer than posterior femur, very 
narrow at base, weakly wrinkled, smooth at apex; following tergites polished; 
ovipositor sheaths about as long as posterior femur. Yellow; metanotum, 
propodeum, and base of first tergite usually more or less piceous or black; anten- 
nae and legs yellow, wings hyaline. 
The National collection contains a male and a female from Ottawa, 
Canada; a male without data; and five specimens from Colorado. 
The writer has also seen a male, in the collection of the Academy of 
Sciences of Philadelphia, from Niagara Falls, N. Y. 
(3) SYNTRETUS BREVICORNIS, new species 
Resembles vigilar but is at once distinguished by the well-devel- 
oped metacarpus and radius, by the perfectly smooth and polished 
mesonotum, the weakly excavated propodeum, and the shorter 
antennae. 
Female.—Length 2.2 mm. Head transverse, completely margined behind; 
face twice as broad as long between bases of antennae and base of clypeus; cheeks 
and temples convex, a little narrower than eyes; antennae not distinctly as long 
as head and thorax combined, 15-segmented; scape not much longer than thick 
and hardly longer than the pedicel; flagellum of uniform thickness throughout, 
the first segment the longest, longer than the scape; all flagellar segments longer 
than thick; ocellocular line and postocellar line subequal, one and one-half times 
the diameter of an ocellus; malar space a little shorter than basal width of 
mandible. 
Thorax at tegulae slightly narrower than head; mesoscutum entirely smooth 
and polished, with no indication of notauli; impression at base of scutellum broad 
and deep, not foveolate, propodeum strongly declivous behind, mostly smooth 
with a large median pentagonal area extending from near base to extreme apex, 
and a narrower lateral area on each side; propodeal spiracles a little before middle; 
mesopleurum completely polished; metapleurum smooth; legs slender; calcaria of 
