March, 1919.] BRUES : XORTH AMERICAN SeRPHID.E. 1 .") 



reaching to the basal third of the petiole of abdomen, all joints simple, cylin- 

 drical; scape narrowed basally, twice as long as thick; first joint three times 

 as long as thick, distinctly longer than the second which is two and one half 

 times as long as thick ; following gradually growing shorter and thinner ; 

 penultimate two and one half times as long as thick. Mesonotum shining, 

 without trace of parapsidal furrows; seen from above the sides of the thorax 

 are concave in front of the tegulae, due to the concave form of the propleurae ; 

 posterior corners of pronotum not produced into distinct swellings or tuber- 

 cles. Propodeum rugose with a distinct median carina on its upper face ; 

 sharply declivous behind ; at the base with a small smooth area on each side 

 which does not extend inward to the median line. Pro- and mesopleurae en- 

 tirely smooth ; punctures inside the posterior margin of the mesopleura 

 slightly elongated below; metapleura finely rugose, with an extremely small, 

 smooth space above. Petiole of abdomen broader than long, irregularly 

 sculptured above, coarsely striate below ; grooves at base of second segment 

 longer than the petiole, of nearly equal length. Legs slightly thickened, espe- 

 cially the posterior femora; longer spur of hind tibia one half as long as the 

 metatarsus ; tarsal claws of four anterior legs each with a long, very stout 

 appendage at the base. Wings hyaline, stigma broad, radial cell nearly half 

 as long as the stigma, the radial vein entering the costa at an angle of about 

 45° ; disc of wing without streaks or traces of other veins. 



Three specimens, the type from Putman, Conn., July 12, 1905 (H. 

 L. Yiereck) ; others from Wisconsin, October. (W. M. Wheeler.) 



Exallonyx carinatus sp. nov. (Fig. 19.) 



($. Length 3.5 mm. Black; antennae piceous, tegulae and legs beyond the 

 trochanters fulvous ; trochanters, except extreme tip and tarsi, fuscous, ante- 

 rior coxae yellowish at tips. Head about one half wider than long, full behind 

 the eyes and then suddenly narrowed ; ocelli in a slightly flattened triangle, 

 the posterior ones as far from one another as from the eye-margin. Eyes 

 removed by a little more than their own width from the posterior margin of 

 the head. Malar space as long as half the width of the eye, with a distinct 

 furrow. Head gradually narrowed below, the anterior margin of the clypeus 

 strongly arcuate. Antennae slender; scape narrow at base, twice as long as 

 thick; flagellar joints simple, first considerably longer than the second, four 

 times as long as thick ; second and following decreasing in length, all about 

 three times as long as thick. Thorax strongly narrowed in front, mesonotum 

 smooth, without trace of parapsidal furrows; posterior corners of pronotum 

 rounded, not produced ; groove at base of scutellum broad and deep. Pro- 

 and mesopleurae smooth ; the punctures inside the posterior margin of the 

 latter very small above, larger but not elongated below. Propodeum long 

 above, suddenly declivous behind, with a strong carina that is especially 

 prominent on the declivity above and suddenly ends there; above on each 

 side of the carina with a long triangular smooth area covering most of the 

 dorsal face ; elsewhere coarsely rugose-reticulate. Metapleura with a rather 



