ODYNERUS. 239 



Eess. a. cliff. — In this species the clypeus % is hexagonal, as 

 broad as long, truncate, while in 0. cubensis % it is longer than 

 broad, bidentate, and its greatest width is situated lower than 

 the middle. The abdomen is not as conical, not sharply truncate 

 at base ; the hinder margin of the 2d segment and the following 

 are more roughly punctate, etc. 



73. O. zomatus Saoss. — Niger, punctatus ; thorace quadrato, paulo 

 longiore quam. latiore, metanoto excavato, acute inarginato, biangulato; 

 puncto frontali, pronoti margine antico et postico, macula subalari, 

 tegulis, scutelli punctis 2, post-scutello, rnetanoti canthis, abdominis seg- 

 mentorum margine, tibiisque partim, flavis; alis nebulosis. — £ . Clypeo 

 polygonali flavo, argeiitato ; auteunis subtus ferrugineis, scapi liuea 

 flava.— £?. 



Odijn. zonatus Sauss. Revue de Zool. XXII, 1S70, 57, 8, % . 



Total length, 11 mm. ; wing, 8 mm. 



Head and thorax cribrose. Thorax square, a little longer than 

 wide. Its anterior margin concave, its angles rather produced, 

 but not acute. Post-scutel truncate. Metathorax much exca- 

 vated ; its edges very sharp, forming on each side an angulated 

 tooth. Abdomen conical, truncate anteriorly (but not sharply) ; 

 the margin of 2d segment and those following strongly punctate. 



Black, with short fulvous, but not velutinous hair ; a spot on 

 the mandibles and a dot between the antennas, a narrow band on 

 the anterior margin of prothorax, a wider one on the posterior 

 margin, a spot under the wing, wing scales, a spot on each side 

 of the scutel, post-scutel, and the ridges of the metathorax, yel- 

 low ; all the segments of the abdomen margined with yellow, the 

 fasciae of the first two segments the widest ; that of the first a 

 little wider on the sides. Knees and tibias outside and the first 

 tarsi, yellowish. Wings cloudy. 



%. Clypeus polygonal, truncate or submarginate, yellow, sil- 

 very; labrnm and scape beneath, yellow, the remainder of 

 antennas ferruginous below; emargination of the eyes argenteous. 



Hess. a. cliff. — This species comes very near to 0. praecox 

 Sauss., and may be a local variety, with all the segments margined 

 with yellow, or even a variety of 0. guadulpensis, wi+h. the orna- 

 ments reduced. 



Hah. Cayenne. (Author's collection.) 



Observation. — The extremity of the antennas being broken off, 



