766 BOSTON JOURNAL 



This is mucli like tlie quadridens Linn., which is a true Ody- 

 nerua, but it is destitute of the metathoracic spines of that spe- 

 cies, and besides other differences it has a band on the second 

 abdominal segment. This latter character not being very obvi- 

 ous may readily have been overlooked by Fabricius. 



The male differs but little from the female ; my specimens 

 have two additional white spots on the anterior portion of the 

 nasus. 



2. 0. OCULATUS — % Black, tips of the abdominal segment.^ 

 and two points on the second segment, yellow. [386] 



Inhabits Ohio and Missouri. 



Body black, with dense, rather large punctures : clypeus yel- 

 low, emarginate at tip : mandibles yellow, honey-yellow at tip : 

 antennae, basal joint yellow, with a black line above : front with 

 a yellow line from the base of the antennae, into the emargina- 

 tion of the eye, and a small spot above the interval of the an- 

 tennae, yellow ; thorax, a bilobed spot on the anterior margin, 

 wing-scale and small spot beneath it, and transverse spot behind 

 the scutel, yellow : wings dusky : tergum not so grossly punc- 

 tured as the thorax ; first segment with a yellow posterior mar- 

 gin ; second with a yellow small dot each side, and yellow poste- 

 rior margin extending around the venter ; remaining segment* 

 obsoletely margined at tip with yellowish : feet yellow ; thighs 

 black at base. 



Length over three-tenths of an inch. 



Like the acitfus Latr., but may be distinguished by its more 

 gross puncturing, as well as by the yellow dots on the tergum* 



A variety from Missouri, has the feet all yellow. 



3. 0. QUADRiDENS Linn. ( Vespa,) Syst. Nat. ; Amoeu. Acad. 

 cinerascens Fabr. The remark " size of parietina " may refer to 

 the male. 



4. 0. UNCiNATA Fabr. ( Vespa,) Syst. Piez. p. 25. — Fabri- 

 cius mistook this species for the quadridens L., which is our 

 largest and most common species, and sufficiently distinguished 

 from the present, besides the denticulated metathorax, by many 

 characters; and the following is a detailed description of it. 



9 Black ; tergum with a yellow band. 

 Inhabits Indiana. 



^ [Vol. T. 



