72 GEO. H. HORN, M. D. 



Smaller species ; the elytral costje either entirely obliterated or very faintly in- 

 dicated ; prosternal lobe very well marked ; ventral segments without 

 lateral callosities. 

 Sides of thorax arcuately narrowing to base ; sides of ventral segments 

 densely punctate and rather densely clothed with tine recumbent pu- 

 bescence. 

 Elytra with first costa faintly indicated and with indistinct discal fovea?. 



4. (lebilis. 

 Elytra without trace of costse or foveas ; a large cupreous humeral space. 



5. axillaris. 

 Sides of thorax straight and almost parallel ; abdomen sparsely punctate and 

 not pubescent. 

 Elytra without trace of costse. or fovea; ; usually blue or green, with a me- 

 dian purple-black vitta, surface shining 6. purpureovittata. 



These species are all from the southwestern regions of our territory. 

 The serration of the femora in atabaUpa is a remarkable character 

 and has not been observed in any other species in our fauna. 



1. C atabalipa Lap. et Gory. — Form elongate, depressed, gradually nar- 

 rower posteriorly fr(jm the humeri ; color above dark bronze, feebly shining, be- 

 neath more brilliant; antennse metallic green, the margins of the joints coppery, 

 joint three nearly as long as the next two, joints four to eleven gradually nar- 

 rower ; front flat, very densely punctate, occiput carinate ; clypeus very broadly 

 emarginatc ; thorax widest one-fourth from apex, in front of which the sides are 

 obliquely narrowed, posteriorly nearly straight and much less oblique, hind an- 

 gles distinct; disc moderately and regularly convex, without depressions, the 

 punctuation at middle rather fine, but not close, becoming coarser, denser and 

 more rugose at the sides ; elytra a little wider than the thorax, humeri rounded, 

 sides very gradually convergent posteriorly, the margin serrate from middle, the 

 apices separately rounded, the sutural angle slightly spiuiform ; surface moder- 

 ately, coarsely and densely punctate, a moderately deep fovea at middle of base, 

 a feebler one near the humeri and three on the disc of each elytron, one in front 

 of middle interrupting the second costa, the second behind the middle and more 

 external, the third between the first and second costse ; the first costa is well 

 marked and extends from the apical margin two-thirds to base, the second may 

 or may not attain the apical margin and extends nearly to base, terminating in 

 the humeral fovea, third costa obsolete ; prosternum slightly lobed in front, the 

 .surface brilliant metallic seneous, smooth along the middle, more coarsely punc- 

 tured in front and at the sides, the pleurse densely coarsely punctured ; metas- 

 ternum and abdomen brilliant seneous, with coppery reflections, the punctures 

 sparse at middle, coarser and closer at the sides, posterior margins of the seg- 

 ments smooth, ventral segments with their angles acute, segments two to five 

 with a smooth tubercde at the sides, more elevated and spiuiform on the last seg- 

 ment ; last segment with the lateral margin serrate, a subniarginal groove ; legs 

 punctate, wneous, with cupreous reflections. Length .56 -.86 inch; 14 -22 mm. 

 (Fig. 1.) 



Male. — Front flat, without tubercles, finely pubescent ; anterior tfluai (5) arcu- 

 ate, scarcely broader at tip, and with about four obtuse teeth on the inner edge 

 near the tip ; middle tibige slightly arcuate, obtusely four to five dentate within ; 



