168 [Feb., 1847. 



tinted with green; moderately convex ; punctate-striate ; outer interstices 

 convex; sides arcuated; beneath blackish, sparsely punctured; femora 

 chestnut-brown ; tibiae and tarsi, dull testaceous or rufous. 



Sph^eroderma, Steph. 



S.? insolita. Rust-red, shining ; tip and basal joints of the antennas, tes- 

 taceous ; thorax narrow : elytra broad, f 1. long. Pennsylvania. 



Light ferruginous shining; head impunctured; tips of the palpi black, 

 antennae moderate, slightly thickened towards the apex, with the two 

 apical joints testaceous, the four preceding black, and the five basal one s 

 testaceous ; second, third and fourth joints short, subequal, the second 

 thickened ; thorax much narrower than the elytra, transverse, convex, with 

 the base and sides obtusely rounded ; impunctured and highly polished : 

 elytra broad, subquadrate, convex, highly polished, with effaced series of 

 very minute punctures; humeral angles prominent: beneath color of the 

 elytra ; feet paler ; posterior femora moderately incrassated : posterior tibiae 

 simple, with a small spur at tip ; penultimate tarsal joint strongly bilobed. 

 This insect possesses entirely the form of a Eumolpus and though a true 

 Haltica Geoffr., it cannot remain in the subgenus Sphoeroderma, Steph. 



Chrysomelidce, Leach. 



Metachroma, Chevr. 



1. M. throackus. Dull rufous ; elytra black, punctate-striate. 1 2-5ths 

 !. long. Pennsylvania. 



Eumolpus thoracicus, Melsh. Catal. 



Dull dark rufous r head finely punctured ; a longitudinal impressed frontal 

 line, not crossing a transverse line between the eyes, both lines sometimes 

 obsolete ; palpi and antennae paler than the head, the last with the five ter- 

 minal joints subequal, larger than the preceding ones ; eyes black : thorax 

 glossy, minutely and distinctly punctured ; an obsolete indentation each 

 side towards the posterior angles ; scutellum rufous, impunctured ; elytra 

 black, tinted with rufous, particularly towards the apex ; punctate-striate, 

 less deeply towards the apex; humeral tubercles impunctured: beneath 

 dusky rufous ; feet paler. Closely allied to canellus, Fabr. 



Var. a. Rufous ; elytra slightly tinted with black. 



2. M. melanura. Black ; head, antennas, apex of the elytra and tarsi, dull 

 rufous. 1 3-5ths 1. long. Pennsylvania. 



Eumolpus melanura, Melsh. MS. 



Black : head dull rufous, densely punctulate ; longitudinal impressed line 

 obsolete, transverse line between the eyes angulate, distinct ; mouth, palpi 

 and antennas, rufous, the last formed as in the preceding species; thorax 

 black, with the anterior edge obsoletely piceous ; glossy, very finely and 

 distantly punctured; scutellum dull rufous, impunctured: elytra black, 

 with the basal edge, humeral tubercles and apical third, dull pale rufous ; 

 punctate-striate, punctures and striae obsolete or almost absent towards the 

 apex: beneath, femora and tibiae, deep black; knees and tarsi, dull rufous. 

 Size and form entirely of i-notata, Say, of which it may prove a variety. 



