18 GEO. H. HORN, M. D. 



4. — Thorax wider in front of base than the base of the elytra margin rather 



broad and entirely lateral consors. 



Thorax not wider than the elytra, discal impressions small 5. 



5. — Apex of thorax narrower than the base. Abdomen coarsely deeply and 



densely punctate subbalteata. 



Apex of thorax not narrower than the base, sides slightly sinuate in front 



of basal angles 6. 



6. — Abdomen similarly punctured over the entire surface; thorax densely 



punctured texana. 



Abdomen with last two segments much more densely' punctured; thorax 



sparsely punctured versuta. 



7. — Abdomen with last three segments more densely and finely punctured than 



the preceding guttifera. 



Abdomen with segments equally but sparsely punctured 8. 



8. — Thorax gradually narrowed from base to apex, not arcuate, disc sparsely 



punctured. Elytra with feeble punctures on the disc mai'iposa. 



Thorax with sides arcuate, disc' densely punctured. Elytra with rather 

 coarse punctures. 



Elytra irregularly guttate ...Culta. 



Elytra "vvith a submarginal and median yellow stripe on each. 



quadrivittata. 



9. — Margin of thorax entirely obliterated except for a short distance at base. 



Elytra with stripes as in quadrivMata geiuina. 



A. pulchella, Herbst. — (PI. I, fig. 22.) Form variable but always with 

 the disc more or less convex, surface sparsely clothed with short brownish hair, 

 thorax always yellow at the sides, elytra extremely variable in markings often 

 entirely yellow except the umjjone. Head coarsely and densely punctured, 

 front feebly impressed, vertex with feeble carina. Thorax convex, not twice 

 as wide as long, apex and base truncate, sides regularly arcuate from apex to 

 base, margin narrow not visible from above; disc convex, median line feebly 

 impressed and with feeble trace of the triangular impression, lateral oblique 

 impressions reduced to a small fovea on each side of middle; surface moder- 

 ately densely and evenly punctured. Elytra as wide as thorax, umbone rarely 

 even feebly prominent, form variable, often robust, sometimes gradually nar- 

 rowing from base to tip and rather finely serrate ; surface striate, outer striae 

 scarcely deeper, moderately punctured, intervals flat, uniseriately punctulate; 

 markings variable, surface always bronzed. Body beneath coppery-bronze 

 shining sparsely hairy. Prosternum gradually arcuate in front, the alse attain- 

 ing the anterior angles. Abdomen sparsely punctured, but somewhat varia- 

 ble, last ventral with distinct double ajjical margin. Length .22 — .40 inch; 

 5.5 — 10 mm. 



The ijuirkings of this species are so extremely variable that with 

 isolated specimens it would be easy to describe four or five species. 

 I have now sixty specimens before me and have examined in select- 

 ing my own series five times that number and have seen every inter- 

 mediate form 



The following varieties may be mentioned : 



