UNITED STATES AND MEXICAN BOUNDARY. 25 



A. pectoralis, niger, capite piceo-variegato, thorace cylindrico (pubescente ?) parce subtiliter punctato, 

 elytris confertim punctatis subtiliter pubescentibus vitta subsuturali testacea postice infuscata, margine 

 laterali fuliginoso, apice singulatim late rotundatis pone medium obsolete bicostatis ; subtus testaceus, 

 postpectore nigro, pedibus nigris, femoribus basi testaceis, antennis piceis basi nigris. Long. - 27. 



A dead specimen found by me at Fort Yuma, California. From some remains of 

 pubescence at the sides I am disposed to believe that the thorax was hairy as in 

 A. vittiger; the abdomen is similarly marked with transverse shining bands. 



Stenaspis solitaria. A beautiful variety of this species having the head, thorax 

 and anterior portion of the elytra of a dull red color was found by Capt. Pope in the 

 valley of the Rio Grande. 



Spbenotbecus suturalis, niger supra tenuiter albo-pubescens, thorace obscure rubro, parce grosse punc- 

 tato, callo parvo dorsali Ifevi, puncto basali, margineque postico albo-pubescente, scutello elytrorumque 

 sutura dense albo-pubescente, bis punctatis, ad apicem sinuatim emarginatis angulo externo dentigero; 

 subtus dense pubescens, femoribus runs. Long. -52. 

 Very distinct from the other two species. Found by Capt. Pope in the valley of 



the Rio Grande. 



Tylosis sell at us, niger, dense cinereo-pubescens, tborace elytrisque coccineis, tenuiter pubescentibus, 

 illo grosse sat dense punctato, margine antico callisque 5 elevatis nitidis nigris, elytris antice grosse, 

 postice confertim subtiliter punctatis, ad apicem rotundatis, macula subscutellari, altera bumerali 

 plagaque communi maxima a quadrante fere ad apicem extensa lateribus profunde sinuata ornatis. 

 Long. -Q8. 



One specimen, Llano Estacado, Capt. Pope. More slender than T. maculatus, 

 with the apex of the elytra less broadly rounded. 



Crossidius h u m e r a 1 i s , sordide luteus, pubescens, tborace rotundato, longius pubescente, rude punctato, 

 callis parvis duobus notato, elytris dense punctatis, vix obsolete bicostatis, linea brevi humerali nigra 

 ornatis ; subtus obscurus, densissime pubescens. Long. -48 — -65. 



Llano Estacado, August, Capt. Pope. Resembles in appearance C. testaceus, 

 but the elytra are more finely and densely punctured, and the elevated lines can be 

 scarcely observed : the sides of the thorax are rounded without any trace of a lateral 

 tubercle. 



Tragidion a r m a t u m , nigrum, breviter pubescens, capite vix cornuto, thorace latitudine breviore, confer- 

 tim punctato, callo dorsali postico laevi, lateribus spina magna armatis, elytris fulvis, margine basali 

 infuscato, baud costatis, antennis articulis 3-7 testaceis ad apicem plus minusye infuscatis. Lon°\ 

 •80—1-0. 

 Llano Estacado, Capt. Pope. Stouter than the other two species, and proportioned 

 nearly as Purpuricenus : the hairs of the head and thorax are shorter, the lateral 

 spine of the thorax much larger, and the elytra uniformly convex, not at all sulcate. 

 The anterior tibiae are sometimes testaceous at the base. The prominences between 

 the antennae, even in the male, are less conspicuous than in the other species, and the 

 first joint of the antennae is comparatively less thickened. 



