ODYNERUS. 197 



is distinct from it in not having the border of the 2d segment at 

 all turned up. 



Hah The Mexican coast. Tampico and the barrancas of the 

 Cordillera. 15 ?, 12 %. 



33. A. oMiipiMS Cress. — Niger, nitidus, sulfureo-multipictus ; anten- 

 nis basi liavis ; pronoti angulis in denteui productis ; metanoto postice 

 planato ; abdominis segmentis 1° 2° late iiavo-uiarginatis ; 2° basi flavo- 

 bimaculato; 1° valde punctate-, valde angustiorequam secundum ; sntura 

 distincta ; alis rugulosis, costa et stigmate ferruginescentibus ; macula 

 rarliali fasca. 



Odynerus obliquus Cress. Philad. Ent. Proc, IV, 1865, 163. 

 Total length, 8.5 mm. ; wing, 6.5 mm. 



% . Small, punctate, very shining. Head circular. Thorax 

 rather attenuated behind; prothorax square, polished ; its angles 

 rather dentiform; scutels flattened, polished ; metathorax polished, 

 but slightly punctate, flattened behind, destitute of lateral angles, 

 with the lateral carinas not very sharp. Abdomen slender; the 

 first segment small, half as wide as the second, rather elongate- 

 bell-shaped, punctate like the thorax ; bearing an obsolete 

 depression ; its suture very distinct. Second segment ovate, as 

 long as wide, with effaced or delicate punctures, subtuberculate 

 above. 



Black. Antenna) fulvous beneath; the first two joints yellow, 

 mandibles yellow ; the forehead between the antenna?, sinus of 

 the eye, and a broad margin behind them, sulphur-yellow ; a 

 broad anterior margin on the prothorax ; the large tegulae, a 

 large spot beneath the wing, scutel, post-scutel, angles of meta- 

 thorax, a broad marginal fascia on the border of the first two 

 abdominal segments, and a spot on each side at the base of the 

 second segment, sulphur-yellow. Feet yellow ; coxae black, the 

 1st and 2d pair yellow anteriorly ; posterior coxas and femora 

 black. Wings subhyaline, cloudy, principally at the extremity, 

 with a dark cloud in the radial cell ; the anterior costa and the 

 stigma rather ferruginous ; sometimes the wing is ferruginous 

 with its apex smoky. 



9 . Clypeus pyriform, punctate, bidentate, yellow, with its apex 

 black. — % . Clypeus yellow, rounded-pentagonal, terminated by 

 two little triangular teeth, separated by a triangular notch. The 

 yellow margin of the second segment is wide and regular ; that 

 of the first not so wide and rather narrowed on the sides. 



