UNITED STATES AND MEXICAN BOUNDARY. 21 



terior face of the occiput being a little flattened, and by the posterior margin being 

 more broadly margined. 



R. bicolor Say, placed as a synonym to v a r i c o 1 o r by Gerstsecker, differs very 

 much by the anterior face of the vertex being flattened, and the posterior so broadly 

 rounded as to appear almost truncate, as noted by Say in his descriptions. Dr. Mel- 

 sheimer considering the name bicolor as preoccupied by Olivier, substituted R. 

 ambiguus, but described under that name a variety of R. pectinatus. Under 

 these circumstances, in view of the fact that the name bicolor was preoccupied at 

 the time of the description by Say, I have changed the name to R. Sayi, and 

 although more recently Gerstsecker has placed Olivier's species as a synonym of 

 R. bimaculatus, this does not obviate the necessity of removing the name which 

 was imposed by Say under a misapprehension. 



Eupompha Lec. 



Oculi subovati, obliqui integri ; antennae inter oculos antice insertae, sublaxe articulatse, filiformes, capite 



thoraceque parum longiores, articulo lmo obconico, erasso, sequentibus duobus breviore, 2ndo parvo, 



3io sequente longiore : palpi breves compressi. Tibiae anticse extrorsum bisinuatae, posticae paulo 



incurvatae ; bae calcaribus brevibus, interno acuto, externo obtuso ; tarsi posteriores compressi subtus 



biseriatim pubescentes, antici (maris ?) articulis tribus dilatatis, inflatis supra concavis, subtus dense 



pubescentibus ; ungues fissi, parte inferiore paulo breviore. Corpus alatum, elytris integris. 



A very singular genus related to Lytta and Phodaga Lec., but sufficiently distinct 



from the first by the entire eyes, placed obliquely and not transversely, and from the 



second by the tarsi not being spinose beneath. The form is long and slender as in 



Lytta polita Say. The anterior thighs are not sinuate beneath near the tip, and have 



no dense pubescence at that place. 



Eu. f i s s i c e p s , capite rufo profunde sulcato, ore fusco, thorace ely trisque cyaneo-viridibus, aenescen- 

 tibus, illo nitido parce punctato, campanulato, canaliculate, dorso antice posticeque transversim 

 impresso, elytris lineis elevatis confertis reticulatis ; subtus viridi-cyanea, pedibus rufis coxis, trochan- 

 teribus f'emoribusque ad basin nigris, antennis brevibus filiformibus, fuscis, articulis tribus primis rufis. 

 Long. -76. 

 Mas tarsis anticis articulis tribus dilatatis, inflatis, supra concavis. 



One specimen collected by Capt. Pope, probable on the Llano Estacado. 



Lytta corvina, atra, opaca, subtiliter nigro-pubescens, capite tboraceque confertissime punctatis, hoc 

 rotundatim quadrato, latitudine paulo breviore, elytris thorace latioribus subtiliter dense punctulatis ; 

 labro rnodice emarginato ; clypeo margine antico piceo-testaceo. Long. '80 — -98. 



Arizona, Dr. Webb: Llano Estacado, Capt. Pope. Resembles L. fissilabris 

 Lec, but is much larger, somewhat stouter, with the thorax broader than long, and 

 the labrum less deeply, though still considerably emarginate. The second joint of the 

 antennae is small ; the first is a little shorter than the third. 



6 



