rhyllutreta.] PHTTOPHAGA. 363 



1. Antenna? nnicolorons black. 



A. Upper surface blue or greenish-blue, 



closely and very finely punctured .... P. NIGBIPBS, F. 



(lepidii, Koch.) 



B. Upper surface black with bluish or greenish 

 reflection, very closely but distinctly and 



comparatively strongly punctured .... P. CONSOBHINA, Curt. 



(meleena, 111.) 



2. Antennm with the basal joints more or less 



distinctly reddish or ferruginous. 



A. Elytra very finely, closely, and confusedly 



punctured." P. PUNCTULATA, Marsh. 



B. Elytra comparatively strongly punctured, 

 the punctures being arranged in more or 



less distinct rows. 



a. Upper surface deep black, without 

 metallic reflection ; thorax evidently more 



finely punctured than elytra P. ATBA, F. 



b. Upper surface with metallic reflection ; 

 thorax nearly as strongly punctured as 



elytra P. CRUCIFES.*:. Goeze. 



(paecilocerat, Com.) 

 II. Upper surface black with yellow bands or patches 



on the elytra. 



i. Outer margin of yellow bands on elytra feebly or 

 moderately emarginate. 



1. Upper surface depressed ; thorax with a more 

 or less distinct metallic reflection, which is some- 

 times marked and sometimes very faint. 



A. Size smaller; yellow bands on elytra 



rather strongly curved inwards at base . . P. viTTTJLA, Reilt. 



B. Size large r ; yellow bands on elytra scarcely, 



or very gradually, curved inwards at base. 



a. Tibia; red-yellow at base only .... P. UNDULATA, Kutt. 



b. Tibiae entirely red-yellow P. NEMOKUM, L. 



2. Upper surface convex ; thorax black, without 



metallic reflection P. FLEXUOSA, ///. 



ii. Outer margin of yellow bands on elytra very 

 strongly emarginate. 



1. Legs, except posterior femora, reddish-yellow P. OCBBIPES, Curt. 



2. Legs mostly black. 



A. Dark space between the yellow bands of 



elytra rectangular P. BIMUATA, Stej-k. 



B. Dark space between the yellow bands of 



elytra elongate-oval P. TKTBASTIQXA, Com. 



ill. Elytra with two yellow spots on each, rarely 

 united by a narrow line ; form short oval and 



convex ; size small P. KXCLAM ATIOHIS, Thumb. 



(brassica, P.) 



P. nodicornis, Marsh, (antennafa, Koch). Oblong, depressed, 

 aeneous or coppery, rarely with a greenish reflection ; head with the 

 vertex very finely punctured, almost smooth, antennae long and moderately 

 stout, black with the apex of the basal joints ferruginous; thorax 

 transverse, but not strongly so, gradually rounded at the sides, very 

 closely aud rather distinctly punctured ; elytra long, subpurallcl, -< pi- 



