52 THE UNIVERSITY SCIENCE BULLETIN. 



O. flaviclavus Barber 1913. 



Can. Ent. XIV, p. 215. 



"Brownish-black. Very much the appearance of O. ameHcanus, to 

 which it is closely related, having the usual carinate and rugulose face. 

 However, somewhat smaller than that species with the clavus entirely 

 yellow. The pronotum with the lateral margins gently rounded, more 

 converging anteriorly, the anterior margin being narrower than the width 

 across the eyes; the anterior angle of the pronotum sharply rounded 

 and not projecting anteriorly as in ame^'icanus ; the expanded part of 

 lateral margins narrower, with a small yellowish spot just posterior to 

 the anterior angle; the humeral angle almost rectangular, projecting but 

 a trifle beyond margin of corium. Extreme edge of corium very narrowly 

 pale, but the usual pale marginal spots are lacking. Surface vdth the 

 usual pearl grey spots. Beneath, with the sternum slate grey; the 

 acetabula, posterior and lateral flange of the presternum, elytral flange 

 anteriorly, posterior margin of metasternum, legs and venter, pale; legs 

 lightly infuscated. Presternum, mesosternum, externally, and metas- 

 ternum before the posterior angle, distinctly punctate. 



"Length, ZV2 mm.; width of pronotum, about 2 mm. 



"Described from a single male in the collection of Mrs. Annie Trum- 

 bull Slosson, taken by her at Ormund, Florida." 



O. banksi Barber 1913. 

 Can. Ent. XIV, p. 214. 



"Broad ovate, brownish black. The head, behind the vertex, opaque, 

 from there anteriorly, shining and obliquely, finely rugulose and tri- 

 carinate; one carina next each eye and a median one, continuous from 

 vertex to apex; transversely sulcate midway between ocelli and base of 

 head. Pronotum vdth anterior margin almost truncated, with the an- 

 terior angles next the eyes rounded and not projecting forward or out- 

 wardly beyond the exterior margin of the eyes; entire lateral margins 

 gently rounding posteriorly; humeral angle rounded, not very prominent; 

 lateral margins broadly expanded, pale; this mark broadest about the 

 middle, more abruptly rounded anteriorly, and tapering posteriorly to 

 occupy the entire margin; the remainder of the surface browmish black, 

 slevated and transversely, but not very deeply, sulcate a very little 

 behind the middle; posterior lobe, middle and anterior part of first lobe 

 more coarsely punctate, the latter with two or three transverse weak fur- 

 rows. Scutellum almost equilateral, rather coarsely punctate and trans- 

 versely furrowed; anteriorly with a transverse elevated ridge, behind 

 which it is depressed. Corium not demarked from membrane, broadest 

 across the middle, with lateral margin gently rounded to just beyond 

 middle, where it more abruptly rounds off" to the rather narrow apical 

 part of membrane; the external margins either broadly pale throughout 

 or in part suffused with fuscous and reflexed, without the usual series of 

 pale marginal spots which occur in O. aniericanus. Clavus and corium, 

 anteriorly, with coarse scattered punctures. Nervures of the membrane 

 indistinct. General surface with indications of the customary bluish 

 grey markings, unless denuded, when the whole upper surface is smooth 

 and shining. Beneath on sternum and venter paler, with rostrum, 

 acetabulae, coxae, legs and external angle of metathorax pale yellow. 

 Prosternum rather coarsely punctate. 



"Length, 4 mm. Width of pronotum, 2 mm. 



"Described from three males and one female collected by Mr. Nathan 

 Banks of Glencarlyn, Virginia, in June. Judging from the meagre 

 descriptions and indiff'erent illustrations at hand, I am led to the opinion 

 that this species is most nearly related to O marginatus Latr., of Europe. 

 But having no specimens of that species for comparison, I am, at this 



