18 PROCEEDINGS OF THE NATIONAL MUSEUM vol.79 



third joint shorter than fifth. Prothorax scarcely twice as wide as 

 long, with arcuate sides, surface alutaceous with scattered coarse 

 punctures; spots usually large, especially the median one, and black. 

 Scutellum entirely dark. Elytra coarsely punctate, with punctures 

 confluent and shallow, not so coarse and distinct as in virgata; finely 

 pubescent; a wide lateral vitta frequently uniting at apex with su- 

 tural vitta, the intervening pale vitta being in many cases extremely 

 narrow but of approximately same width throughout its length, 

 these dark vittae blue or green (often inconspicuously so), not 

 lustrous. Body beneath pale with sides of metasternum and abdo- 

 men widely darkened. Length, 5.6 mm. to 6.5 mm; width, 2.5 mm. 

 to 3.2 mm. 



Type. — Collected by C. A. Frost, July, 1929, Portaupique, Nova 

 Scotia. U.S.N.M. No. 43019 (with 7 paratypes). Ten paratypes in 

 collection of C. A, Frost. 



Distribution. — Nova Scotia (Castlereigh, Westchester, Portau- 

 pique). 



Food plant. — Goldenrod, Solidago. 



Remarks. — The three species of the convergens group — neoscotiae, 

 GonvergcTis^ and viridicyanea — are all closely related, although 

 easily separable by their elytral coloring and generally by their geo- 

 graphic range. They may all be varieties of a small northern spe- 

 cies. I am unable to separate them by the shape of the aedeagus, 

 which in all is very similar. LeConte treated the first of these 

 {neoscotiae) as a form of convergens^ in which the lateral and su- 

 tural vittae frequently are not united. The Nova Scotia specimens 

 also are unlike typical convergens in coloring, having dark vittae 

 without metallic luster, and often appearing nearly black. T. neo- 

 scotiae is not so densely pubescent as typical convergens., and the 

 sutural and lateral vittae never coalesce so as to cover the elytra 

 except for the pale margin, as is frequently the case in typical con- 

 vergens. The ventral surface also is not so completely darkened. 



7. TRIRHABDA CONVERGENS LeConte 



Plate 1, Fi^ire 7 



Trirhabda convergens LeConte. Proc. Acad. Nat. Sci. Philadelphia, vol. 17, 

 p. 220, 186.5. 



Descriptio7i. — Small, subparallel, faintly shining with metallic 

 luster, pale with a wide dark basal plaga across head, large black 

 pronotal spots and elytra either entirely metallic green except for 

 margin or with narrow pale vitta, usually wider at base and not 

 reaching apex; ventral surface dark. Head alutaceous with obso- 

 lete rugose punctation; a wide dark plaga, often with green luster, 

 <over base of head, frequently reaching margin of eyes and some- 



