Fossorial Hymenoptera of North America. 429 



with two yellow spots ; mandibles and palpi black; % antenna? deep 

 black, scape yellow beneath and above at tip; 9 flagellant red beneath, 

 black above. Thorax black, prothorax yellow above; tubercle and 

 spot behind yellow; scutellmn striped with yellow behind, often wholly 

 black; propodeum polished, with about seven large, raised, straight 

 stria:, very equal in size, on each side of the very narrow mesial fur- 

 row; posteriorly a smooth yellow area on the middle of the flanks. 

 The striie are unusually straight and continuous, with no cross striae 

 between them; free from pubescence ;$ much smoother, more polished 

 than 9 .with a deep mesial furrow. Tegula? dark, nervm-es dark, es- 

 pecially on the costa; pterostigma reddish, 3d costal clouded; fore 

 femora black, tipped, or striped their whole length yellow; middle and 

 hind femora black, slightly fuscous, yellow at tip; tibiae yellow, black 

 above, hind tibiae black on the terminal half; two anterior pairs of 

 tarsi yellowish, posteriorly fuscous, 9 with the hind basal joint fuscous 

 at base. Abdomen deep black, with a broad yellow baud, widening 

 on the sides, on the remaining rings the yellow bands, especially in the 

 S , are wider than usual, tip. or 6th ring, with a thick powdery greyish 

 pubescence, 9 tip black, supraaual area triangular, of the usual size. 



Length % , .3-4; 9 , .48 inch. 



Maine, August, on Spiraea alba, (Packard). Mass., (Coll. Harr., 

 Ent. Soc. Phil.). 



Differs in its black head, yellow clypeus, black mandibles and palpi, 

 black antenna?, the peculiar sculpturing of the propodeum, and the 

 unusually broad Hues on the abdomen ; also in the black costa and in 

 the clear wings, which are clouded only near the 3d costal. From G. 

 phaleratus, which it resembles, it may be distinguished by the small 

 dots on the propodeum, by the more regular stria?, aud the absence of 

 the usual transverse stria? between the longitudinal ones. 



Gorytes flavicornis. Packard. 



Odynerus? flavicornis, Harr. Cat. Ins. Mass., p. 68. (1835). 

 % aud 9 . Head smooth and highly polished, with a brown pubes- 

 cence ; orbits yellow ; entire clypeal region yellow, with a thin pubes- 

 cence, edge emarginate, testaceous, mandibles yellow, tipped with black, 

 antennae with the scape yellowish beneath, flagellum fuscous beueath 

 and at base above, brown towards the tip ; whole body of a rich po- 

 lished brown, with a paler pubescence. Prothorax with a yellow stripe, 

 tubercle yellow, with a minute yellow dot. edge of meso-scutum tinged 

 with reddish just behind the tegulae; scutellum with a narrow yellow 

 stripe on the hind edge, which is irregular on the front edge ; propo- 



