10 BULLETIN 14 5, UNITED STATES NATIONAL MUSEUM 



29. Male with the first and second abdominal segments feebly, longitudinally 



flattened at middle; sides of male genitalia strongly, arcuately expanded 



near apex. Host plant: Oak (26) frosti Knull. 



Male with the first and second abdominal segments not flattened at middle ; 

 sides of male genitalia strongly, arcuately expanded near middle, and 



parallel toward apex. Host plant: Butternut (27) juglandis Knull. 



(?) (28) puncticeps LeConte. 



30. Pygidium with a projecting carina 31. 



Pygidium without a projecting carina 57. 



31. Elytra with a distinct longitudinal costa on each elytron 32. 



Elytra without, or with only a vague longitudinal costa on each elytron— 33. 



.;2. Scutellum transversely carinate; tips of elytra narrowly rounded. 



(29) macer LeConte. 

 Scutellum not transversely carinate; tips of elytra acute. 



(2) nevadensis Horn. 

 33. Elytra bicolored, bronzy or reddish cupreous, with a greenish or purplish 



sutural vitta common to both elytra (30) pulchellus Bland. 



Elytra unicolored 34. 



A4. Pronotum with the sides and median part densely pubescent 35. 



Pronotum without a densely pubescent median vitta, but sometimes the 

 sides are pubescent, especially anteriorly 37. 



35. Propleurae, mesopleurae, metapleurae, and coaxe densely pubescent; sides 



of prosternal process not bent downward near apex 36. 



Propleurae, mesopleurae, metapleurae, and coxae not densely pubescent; 

 sides of prosternal process usually bent downward and forming a tooth 

 near apex (31) vittaticollis (Randall). 



36. Head deeply depressed in front, and the lower half densely pubescent; male 



with only an obsolete depression on second abdominal segment. 



(32) benjamini Fisher. 



Head moderately depressed in front, and rather densely pubescent over 



entire surface; male with a deep, smooth, elongate depression on second 



abdominal segment (33) audax Horn. 



37. Pronotum without, or with only feebly indicated prehumeral carhiae 38. 

 Pronotum with distinct prehumeral carinae 47. 



38. Elytra with pubescent spots or vittae 39. 



Elytra without pubescent spots or vittae 41. 



39. Elytra with pubescent spots (34) pilosicollis Fisher. 



Elytra with pubescent vittae (sometimes only indicated in basal depres- 

 sions) 40. 



40. Elytra black, with a more or less distinct whitish or yellowish pubescent 



vittae on each elytron (35) bilineatus (Weber). 



Elytra blue, or bluish black, with only indications of the pubescent vittae 

 in the basal depressions (35a) bilineatus subspecies carpini Knull. 



41. Species distinctly bicolored; head and pronotum green, with a cupreous or 



aureous tinge ; elytra black, with a feeble greenish or violaceous reflection. 



(36) quercicola Fisher. 



Species unicolored, dark blue, black, or olivaceous, frequently with a 



greenish or bluish tinge. (Somtimes the head and pronotum is vaguely 



more aeneous) 42. 



;i. Vertical portions of the abdominal segments densely pubescent, except 



sometimes the second 43. 



Vertical portions of the abdominal segments not conspicuously pubescent; 

 male with the tarsal claws similar on all feet (37) criddlei Frost. 



