64 MISC. PUBLICATION 470, U. S. DEFT. OF AGRICULTURE 



narrowed toward apex; intermediate segments compact, slightly wider than 

 long ; third segment one-fourth longer than fourth. 



Pronotum nearly twice as wide as long, subequal in width at base and 

 apex, widest near middle ; sides arcuately rounded, slightly more obliquely con- 

 verging posteriorly ; posterior angles broadly rounded ; anterior margin strongly 

 sinuate, with a distinct, broadly rounded median lobe; base broadly, arcuately 

 emarginate on each side, median lobe broadly rounded, and subtruncate in 

 front of scutellum; disk moderately convex, without distinct callosities or 

 depressions ; surface sparsely, finely, irregularly punctate, more or less trans- 

 versely rugose, sparsely clothed at sides with short, white hairs, intervals 

 finely granulose. 



Elytra at base slightly wider than pronotum at middle; sides slightly, 

 obliquely diverging from humeral angles to apical third, then arcuately con- 

 verging to tips, which are separately, broadly rounded ; lateral margins not 

 distinctly serrate posteriorly; basal depressions broad and deep; humeral de- 

 pressions vaguely indicated ; surface rather uneven, finely, sparsely, irregularly 

 punctate, sparsely clothed with short, erect, inconspicuous hairs. Each elytron 

 with a short longitudinal costa extending along sutural margin on apical half, 

 the costa sinuate near apex, and three other vaguely indicated costae, and with 

 three small, irregular, coppery-yellow foveae. 



Abdomen beneath sparsely, finely punctate, sparsely clothed with short, 

 recumbent, white hairs, with smooth lateral callosities, the intervals vaguely 

 granulose; last visible sternite narrowly emarginate at apex, without a dis- 

 tinct submarginal ridge, lateral margins strongly serrate ; eighth tergite sparsely, 

 coarsely punctate, broadly, arcuately emarginate at apex. Prosternum coarsely, 

 sparsely punctate, sparsely clothed with moderately long, recumbent, white 

 hairs ; anterior margin with a broad, short, median lobe. Anterior femur with 

 a broad, obtusely triangular tooth, which is strongly dentate on outer margin. 

 Anterior tibia slightly arcuate, unarmed at apex; middle and posterior tibiae 

 straight. 



Length 8 75 mm., width 3.5 mm. 



Male. — Differing from the female in having the antenna bright green, the 

 head bright green, becoming cupreous on occiput, more finely and densely 

 punctate, with a very broad, obscure chevron on vertex, and the intervals 

 subopaque and densely granulose, the last visible sternite broadly, arcuately 

 emarginate at apex, and the anterior tibia armed with a rounded dilation 

 near apex. Genitalia not examined. 



Length 6.5 mm., width 2.6 mm. 



Kedescribed from the female lectotype and male paratype, No. 

 3293, in the Academy of Natural Sciences of Philadelphia. 

 Type locality. — Nebraska, no definite locality. 



DISTRIBUTION 



From material examined : 



California : Lundy, 7.000 to 8,000 feet, July 8-10 (H. F. Wickham). 

 Nebraska: No definite locality. Type series (John Pearsall). 



Host. — Unknown. 



No variation worthy of mention was observed in the few specimens 

 examined. This form is rare in collections. Crotch (1873) con- 

 sidered it a color variety of aeneola and Horn (1880) placed it as a 

 synonym of that species. It is closely allied to aeneola but differs 

 from that species in having- the lateral margins of the last visible 

 abdominal sternite distinctly serrate, the elytra ornamented with 

 distinct golden-yellow or cupreous foveae, and the last visible ab- 

 dominal sternite of the female more deeply, narrowly emarginate at 

 the apex. It seems advisable to retain purpurata as a valid species, 

 at least until its habits are known and more material is available for 

 study. 



