OF WASHINGTON. 183 



(Bull. 14, Exper. Stat. Nebr., 1890, p. in) that the larvae are 

 common on Salix, but they have not been bred and may belong 

 to D. 5-vittata. That the real food-plant of the latter species 

 is Salix was first proven by Walsh (Proc. Hnt. Soc. Phil. Ill, 

 pp. 404, 405 ; 1. c. VI, p. 270). Various other records of these 

 two species refer apparently only to the food-habit of the imago. 



D. caroliniana. Whether Mr. W. H. Harrington's statement 

 (Can. Knt. XVI, 1884, p. 97) that this species feeds abundantly 

 on Rumex verticillatus refers to the imago only, or also to the 

 larva is uncertain. Nor is it certain that he had the true D. 

 caroliniana before him. 



Haltica chalybea. All references to this species as a grape 

 vine pest in the eastern United States are no doubt correct, 

 while those from the Southwest and the Pacific slope are, to 

 say the least, open to doubt. 



Some uncertainty prevails regarding other food-plants of the 

 larva. That the latter lives on Alnus serndata seems to be 

 certain, but its occurrence on Ulmus and Prunus is doubtful, 

 and these latter records refer probably only to the imago. The 

 species must have still another true food-plant since the images 

 are abundant on various trees in the semi-tropical hammock of 

 Florida, where Vitis, Alnus, etc., do not occur. The imago 

 was found by me in great numbers on Carpinus at Ft. Pendle- 

 ton, Md., but no larvae were seen among them. 



H. ignita. This variable species has often been incorrectly 

 determined in former times, and the bright aeneous or copper- 

 colored varieties were usually named H. carinata in collections. 

 Most of the references to the latter species should therefore be 

 transferred to ignita. The imago appears to be more poly- 

 phagous than any other species of this genus. The food-plants 

 recorded are : Kalmia latifolia, K. glauca, CEnothera biennis, 

 Erechthites hieracifolia, Vitis (?), cultivated strawberries and 

 cultivated Fuchias. Quite a number of other plants could be 

 added to these, but how many of them are the food-plants of 

 the larva remains doubtful. The larvae have been bred from 

 CEnothera biennis by Prof. Riley (Amer. Knt. Ill, p. 200), and 

 this seems to be the only true food-plant ascertained so far. 



H. carinata. From the geographical distribution as given 

 by Dr. Horn it is evident that all references to this species 

 from the more southern portion of the Atlantic slope are based 

 upon incorrect determination and should be referred to some 

 other species, probably always H. ignita. Mr. W. L. Deve- 

 reaux (5th Rep. U. S. Hnt. Comm. p. 276) gives Ulmus as the 

 food-plant, but since he describes the imago as being "of a 

 greenish hue ' ' there is considerable doubt as to correct deter 

 mination. Dr. Horn (Trans. Amer. Ent. Soc. XVI. 1889, 

 p. 223) states upon authority of Mr. D. W. Coquillett that this 



