1908] Bnics, No7'th American Parasitic Hymenoptera VI. 53 
toward the tip ; first segment one-third longer than broad at apex, its 
basal half with two very strong- carinai which become evanescent just 
beyond the middle, lateral carinte strong and well away from the mar- 
gin ; its surface longitudinally rugose. Second segment as broad as 
long, third wider and shorter, both scabrous or finely rugulose ; fourth 
punctulate at the base, apical ones smooth and shining. Legs ferru- 
ginous, the coxae, particularly the posterior pair, black basally, their 
tips and the trochanters pale 3'ellow ; posterior tarsi piceous. Wings 
hyaline, the stigma and veins piceous black, the former pale basally ; 
areolet open, its proximal shorter than its lower side ; transverse 
median vein in hind wing broken at the middle. Clypeus, broad 
anterior orbits, two paired spots on face, mandibles except tips, spots 
at base of antennae above, under side of pedicel, tegulae, spot below and 
before ; cuneiform spot on mesonotum, short line near anterior margin 
of mesopleura, spot at base of hind wing-, and a large mark on scutel- 
lum, pale yellow. Second to fourth segments of abdomen ferruginous, 
the second and third yellowish at apex and the fourth darker at base ; 
following segments with a rufons margin. 
Beulah, New Mexico, Aug. 3, 1902, Prof. T. D. A. Cockerell. 
This differs from Z. saginatus Prov. to which it is most closely 
related, by the black antennae, the absence of any transverse line 
on the third segment, and the entirely black first abdominal seg- 
ment. It is slightly larger. 
Syrphoctonus lasvis sp. nov. 
Female. Length 6 mm. Black, legs, except tips of posterior tibiae 
and tarsi which are ferruginous, pale yellow ; spots on face and meso- 
notum pale yellow. Head two and one-half times as wide as thick, 
finely shagreened, with microscopic punctures intermixed. Face rather 
strongly depressed on the sides, between the eye-margin and the central 
convex portion. Clypeus strongly raised, its anterior margin rounded 
and deeply incised medially. Eyes not quite so long as the width of 
the face ; bare. Antennae 21-jointed ; first flagellar joint one-third 
longer than the second, which is three times as long as thick and about 
as long as the scape ; third and following growing shorter, the fifth 
about two times as long as thick. ^lesonotum subshining, faintly 
punctulate ; scutellum shagreened and punctulate. Metanotum punctu- 
late or scabrous, without any indications of any areas. Pleurae shin- 
