6 GEO. H. HORN, M. D. 



emarginate at apex, base truncate, sides feebly arcuate but rapidly divergent 

 posteriorly, near the base suddenly arcuately narrowed, margin acute, visible 

 in its entire extent from above, not reflexed, surface densely and coarsely punc- 

 tured, with a broad triangular median and on each side an oblique impression. 

 Elytra twice as long as wide at base and with rows of cribrate punctures obliter- 

 ating the intervals excepting the fourth and sixth, the former sub-eostiform and 

 extending three- fourths to apex, the latter less elevated extending to middle; 

 sides of elytra from apical third to tip rather coarsely serrate, humeral umbone 

 moderately prominent. Body beneath colored as above but more shining. 

 Thorax coarsely not densely punctured, sternum in front strongly trisinuate. 

 Metasternal side pieces and coxal plate coarsely and densely punctured. Ab- 

 domen sparsely punctate, intervals smooth. Last ventral with very feeble 

 submarginal line at tip. Surface beneath and legs sparsely clothed with 

 moderately long wliitish hairs. Length .46 inch; 11.5 mm. 



This species is readily known by its uniform color and depressed 

 form. It is doubtful as a member of our fauna and is introduced on 

 tlie authority of the collection of Count Mnizech of Paris from whom 

 Dr. Lecoate obtained a specimen said to have been collected in our 

 territory. 



A. amplicollis, Lee. — (PI. I, fig. 1.) Form elongate triangular, very 

 obtuse in front, thorax greenish, shining, sides broadly yellow, elytra slightly 

 bluish ornamented with yellow longitudinal bands and irregular transverse 

 fasciae; surface sparsely clothed with short pale brown hair on the thorax, 

 black on the elytra. Head coarsely and moderately densely punctured, front 

 slightly concave, vertex with feeble carina. Thorax more than twice as wide 

 as long, apex emarginate base truncate, sides very feebly arcuate, rapidly 

 diverging posteriorly; hind angles rounded, wider than the elytra, lateral 

 margin moderately broad, visible in its entire extent from above and distinctly 

 reflexed; disc with broad median triangular impression and on each side near 

 the base a moderately impressed fovea, surface coarsely but not densely punc- 

 tate, color greenish, shining, sides rather broadly yellow, the latter color not 

 reaching the anterior angles. Elytra twice as long as wide, gradually narrow- 

 ing at basal three-fifths then rapidly narrowing to apex, sides near tip moder- 

 ately strongly serrate; surfac^e convex, disc slightly flattened, and with rows 

 of large punctures deeply impressed, intervals distinct and with a single series 

 of finer punctures, except behind the humeral umbone where the punctures of 

 the striae are large and confluent; umbone moderately prominent; color very 

 dark blue ornamented with yellow forming at apical three-fifths a marginal 

 plaga broader posteriorly and also a subsutural narrower stripe uniting with 

 the former posteriorly, apical two-fifths with two narrow transverse bands 

 interrupted at the suture. Prosternum trisinuate in front, sparsely punctured, 

 sides of prothorax more coarsely but not densely punctured. Abdomen be- 

 neath moderately coarsely but not densely punctured. Color beneath dark 

 metallic green, sparsely clothed with whitish hairs. Last ventral segment with 

 distinct double margin at tip. Length .38— .44 inch; 9.5—11 mm. 



This species occurs in Arizona and may be known especially by its 

 broad thorax and the style of the elytral marking which has no parallel 

 in this portion of the group. 



