ODYNERUS. 239 



Bess. a. dlff. — 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 coni&il, not sharply truncate 

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

 are more roughly punctate, etc. 



73. 0. zomatlis Sauss. — Niger, punctatus ; thorace quadrato, paulo 

 longiore quam latiore, metauoto excavato, acute inarginato, biangulato; 

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

 tegulis, scutelli punctis 2, post-scutello, metanoti cantbis, abdominis .seg- 

 mentorum margine, tibiisque partim, flavis; alis nebulosis. — % . C'lypeo 

 polygonali flavo, argeutato ; antennis subtus ferrugineis, scapi linea 

 flava.— $?. ^ 



Odyn. zonatus Sauss. Revue de Zool. XXII, 1870, 57, 8, % . 



Total lengtb, 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. Metatborax 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 antennae, 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 metatborax. 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 tibiae outside and the first 

 tarsi, yellowish. Wings cloudy. 



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

 very; labrnm and scape beneath, yellow; the remainder o{' 

 antennae ferruginous below; emargiriation of the eyes argenteous. 



Bess. a. <////'. — This species conies very near to (). prsecox 

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

 with yellow, or even a variety of 0. guadulpensis, wi'U the orna- 

 ments reduced. 



llab. Cayenne. (Author's collection.) 



Observation. — The extremity o( the antenna being broken off, 



