THE CANADIAN ENTOMOLOGIST. 29 



THE COI.EOPTERA OF CANADA. 



BY H. F. WICKHAM, IOWA CITY, IOWA. 



XX. The Chrysomelid.e of Ontario and Quebec — (Continued). 

 Tribe IX. — Galerucini (Sub-tribe Halticini). 



The "jumping beetles," or "flea beetles," constitute the above sub- 

 tribe, and are separated from the genuine Galerucini by the fact that tlie 

 hind thighs are greatly enlarged and thickened for leaping. Most of the 

 species are quite small, though a few are of moderate size for this family, 

 and a considerable number of them are prettily coloured. They are of 

 great importance from an economic standpoint, a number of them being 

 quite injurious. The identification of some of the members of this group 

 is attended with considerable difticulty, yet most of the genera have a 

 peculiar facies, which, once grasped, renders the proper location of addi- 

 tional specimens tolerably certain. 



The sub-tribe has recently been worked up in detail, as far as the 

 North American species are concerned, by Dr. Horn, from whose paper 

 on the " Halticini of Boreal America " most of the tables and specific 

 diagnoses have been condensed. His paper has rendered possible an 

 intelligent survey of the group — something heretofore lacking in the 

 American literature on the subject. The diagrams representing elytral 

 markings are reproduced from the figures given in his article. 



A. Last joint of hind tarsi globosely inflated; elytra with confused 

 punctuation, surface glabrous. Size, large or liiO^txdX^.CEdionychis. 

 AA. Last joint of hind tarsi not globose, usually slender, sometimes 

 thickened when viewed laterally. 



b. Anterior coxal cavities open behind. Mesosternum visible. 



c. Prothorax without antebasal transverse impression, hind tibipe 

 faintly or not grooved, 

 d. Moderate or large sized species, first joint of hind tarsi 

 short, as compared with tibite, and rather \)XOd.d^.Disonyc]ta. 

 dd. Small species, first joint of hind tarsi long and slender. 



Hind tibi^ grooved on outer edge, first joint of hind 

 tarsi as long as one-half the tibia Lo?igitarsus. 



Hind tibise not grooved, slightly excavated near tip; first 

 joint of hind tarsi about one-third as long as 

 tibia PJiyllotreta. 



