ODYNERUS. 235 



he had seen the female of it; when he said "bordered with yel- 

 low," he had seen the male, which he may have taken for a female, 

 because the antenna? do not possess a hook. 



According to Latreille, the prothorax is ornamented with yellow 

 on the anterior border, and it has a yellow dot behind the eyes, 

 but we suppose that he "was rather troubled about the golden 

 reflections. 



This unfortunate description of Latreille has caused me to 

 lose infinite time in vain researches, without the least result, 

 so that I have finally brought ni3 T self to announce the above 

 opinion which I think to be the only correct one. 



68. O. sssaajilicicorBiis Sauss. — 0. nasidenti similliraus, sea" thorace 

 panlo breviore et clypeo in utroque sexu truncato, baud distincte 

 emaiginato, J apice flavo-bipunctato, % flavo-ruarginato. 



OJi/nerus simplicicornis Sauss. Vespides, III, 253, % (lS54);Id. Sagra's 

 Hist, de Cuba, Ins. 771, pi. 19, fig. 5.— Rev. Zool. X, 1858, lb'ti 

 (faulty).— Ckesson, Phi lad. Eut. Proceed. II, 1865, 165. 



9 . Total length, 11 mm. ; wing, 9 mm. 



% . Total lengtb, 8 mm. ; wing, 7 mm. 



9. A little smaller than the large variety of the 0. nasidens ; 

 the same color, the same velvety and silky aspect. Clypeus a 

 little striate, less strongly punctured, truncate at the extremity, 

 but biangulate, often a little bidentate. Thorax a little longer 

 than wide ; shorter than with the 0. nasidens, longer than with 

 the 0. brevithorax ; metathorax as with the 7iasidens, finely 

 striate. Abdomen as with the 0. nasidens. Antenna? ferrugi- 

 nous beneath in their first moiety ; a yellow dot on the summit 

 of the mandibles, two at the base of the clypeus, and often two 

 more on the front; posterior border of the prothorax, often the 

 anterior also, post-scutel, superior ridges of the metathorax, and 

 border of the segments 2-6 yellow ; tibia? often ornamented with 

 yellow. Wings ferruginous, with the end gray. 



%. Smaller; clypeus polygonal, truncate, offering at the two 

 extremities of its inferior border a marked angle, more decided 

 than in the 0. aiu-crfus %; its lateral and inferior borders, yellow; 

 a yellow line on the scape and in the sinus of the eyes. Yellow 

 ornaments of the thorax indistinct. 



Bess. a. diff. — Differs from the 0. brevithorax by its clypeus, 

 which is not strongly bidentate, and by the yellow ornaments of 



