Sept., '05] ENTOMOLOGICAL NEWS. 231 



the elytra. The intervening surfaces, as also the thorax, are 

 very coarsely, in part confluently punctured, leaving a net- 

 work of shining reticulations. There are indications of inter- 

 mediate costae between the suture and the first costa and be- 

 tween the second and third costae. The color of the speci- 

 mens is ferruginous brown, paler at the sides, the elytral 

 costae slightly darker. G. tanaceti differs from G. pomonte in 

 the deep black color, the absence of well defined elytral costae, 

 the less convex form and in the very deep groove along the 

 side margins of thorax and elytra. In G. tanaceti the mar- 

 ginal groove of the elytra is very deep at the humerus and 

 continues far along the front margin, while in G. pomona: it is 

 much shallower and stops short in front of the humerus. 

 Galeruca externa is confined to the Rocky Mountain region 

 and, although costate like G. pomonce, is amply distinct. Its 

 form is very depressed, the elytral interspaces are alutaceous 

 with much finer punctures, two shining callosities upon the 

 thorax, and the color dull black, with broad, w^ll-defined yel- 

 lowish side margins of the thorax and elytra. The marginal 

 grooves are very shallow, and upon the sides of the thorax 

 are almost obsolete. 



It would be interesting to learn something of the habits of 

 Galeruca pomona? in America. In Europe it is a common and 

 well known species. Kaltenbach (Pftanzcnfeinde, p. 315, 374) 

 states that the larvae of G. pomona? feed upon Centaurea jacea, 

 Cirsium palustre and Scabiosa succisa, and those of G. tanaceti 

 (1. c., p. 344-345, 773) upon Achillca millcfolium, Centaurea 

 jacea and Cerastium arvense. Weise (1. c., p. 639), in a 

 general account of the larvae of Galeruca, states that they 

 sometimes appear in early spring in destructive numbers. He 

 adds to the food-plants given above Taraxacum officinale and 

 Artemisia campestris, but it is not clear to what species these 

 should be referred. Of the European plants mentioned Achillca 

 miltc folium (yarrow), Taraxacum ojficinale (dandelion) and 

 Cerastium arvense are widely distributed in this country and 

 Ce7itaurea jacea is established in Vermont, northern New York 

 and along the eastern seaboard. The larva of Galeruca is 

 cylindrical, rather stout, and supplied with numerous large 



