A REVISION OF NORTH AMERICAN CHRYSOBOTHRINI 233 



(106) Chrysobotheis biramosa (Fisher) 

 (Fig. 100) 



Knowltonia Uramosa Fisher, 1935, Ent. Soe. Wash. Proc. 37: 117-118. (New- 

 synonymy. ) 



Figure 100. — Clypeus (A) and last visible abdominal sternite of male (B) of 



Chrysobothris biramosa. 



Male. — Broadly elongate, moderately convex above, slightly shining, brownish 

 cupreous, with a more or less greenish tinge, elytra ornamented with irregular, 

 violaceous-black spots; beneath brownish cupreous, with distinct greenish and 

 bronzy reflections. 



Head uniformly brownish cupreous; front slightly convex; surface densely, 

 coarsely, shallowly, irregularly punctate, finely, densely granulose, sparsely 

 clothed anteriorly with short, erect, inconspicuous hairs ; clypeus broadly, arcu- 

 ately emarginate in front, arcuately rounded on each side. Antenna biramose, 

 extending to basal third of pronotum, densely granulose ; basal segments coarsely 

 punctate ; rami densely clothed with short, erect hairs, the outer ramus on 

 each segment slightly shorter than the inner one. 



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

 just behind middle; sides arcuately rounded, more obliquely anteriorly; pos- 

 terior angles broadly rounded; anterior margin slightly sinuate, with an in- 

 distinct, broadly rounded, median lobe; base transversely subtruncate on each 

 side, median lobe strongly produced and broadly rounded ; disk uniformly 

 convex, without depressions or callosities ; surface glabrous, densely, finely 

 granulose, rather densely, coarsely, irregularly punctate, and transversely rugose 

 along base. 



Elytra at base as wide as pronotum near middle, one and one-third times as 

 long as wide, widest at apical third ; sides slightly diverging from humeral 

 angles to apical third, then arcuately converging to tips, which are conjointly 

 broadly rounded, but not extending to tip of abdomen; lateral margins slightly 

 serrate posteriorly ; basal depressions round and deep ; humeral depressions 

 indistinct ; surface glabrous, densely, finely granulose, coarsely, densely punctate, 

 more or less rugose, each elytron ornamented with violaceous-black markings 

 as follows : A large, irregular, elongate spot covering median part, but inter- 

 rupted at middle and apical third by brownish-cupreous spots. 



Abdomen beneath coarsely, rather densely, irregularly punctate, smooth along 

 anterior and posterior margins of sternites, sparsely clothed with short, in- 

 conspicuous hairs, without lateral callosities, intervals finely granulose ; last 

 visible sternite broadly, arcuately emarginate at apex, without a submarginal 

 ridge, lateral margins not serrate; eighth tergite coarsely, confidently punctate, 

 broadly rounded at apex. Prosternum coarsely, sparsely, irregularly punctate, 

 sparsely clothed with short, inconspicuous hairs ; anterior margin truncate, 

 without a median lobe. Anterior femur with a long, acute tooth, which is not 

 distinctly dentate on outer margin. Anterior and middle tibiae slightly arcuate, 

 unarmed at apices ; posterior tibia straight. Genitalia similar to those of 

 alleni. 



Length 10 mm., width 4 mm. 



Female. — Unknown. 



Redescribed from the male type in the United States National 

 Museum. 



