22 PROCEEDIN-GS OF THE NATIONAL MUSEUM vol.82 



County); Texas; New Mexico (Las Vegas, Santa Fe) ; Arizona 

 (Oak Creek Canyon, White Mountains) ; Nevada (Ormsby County) ; 

 Wj'oming (Cheyenne, Laramie) ; Utah (American Fork, Coalville) ; 

 Colorado (Antonito, Denver, Colorado Springs, Fort Collins, Gree- 

 ley, Poudre Fork) ; Idaho (Blackfoot, Pocatello) ; Montana (Assini- 

 boine, Billings, Bozeman, Glendive, Helena, Huntley) ; California, 

 (Oakdale, Oil City, Kern County, Sacramento, Snelling) ; Nova 

 Scotia (Truro); Ontario; Manitoba (Aweme, Onah) ; Saskatche- 

 wan; Mackenzie (Mackenzie River); Northwest Territories (Simp- 

 son) ; Alberta (Medicine Hat) ; British Columbia (Oliver, Osoyoos). 



Food 'plant. — Salix. 



Remarks. — This is one of the species that have been confused 

 under the name of D. quinquevittata (Say) since Horn's revision of 

 the genus. From Say's description of quinquevittata from Missouri, 

 it is not clear which of several closely related species he had before 

 him. Both pluriligata and the present species are found in Mis- 

 souri, as well as punctigera^ and Say's description applies equally 

 well to all three. D. pluriligata is found in the Middle and Gulf States 

 and westward but not north of Illinois. I have examined only one 

 specimen from the East and this, labeled College Park, Md., col- 

 lected by Duckett, is probably mislabeled, as much of Duckett's ma- 

 terial was mounted after his death. D. punctigera is also a western 

 species, not known east of Illinois. D. altemata was described by 

 Illiger as coming "aus Carolina; Bosc d'Antic. Auf verschiednen 

 Gartengewachsen in Pensylvanien ; Pred. Melsheimer; Prof. 

 Knoch." Although I have not seen the type of altemata^ from 

 comparisons made by Dr. W. G. Kuntzen with the Illiger specimens 

 in the Berlin University Zoological Museum I have little doubt that 

 the eastern species commonly called quinquevittata (Say) is the 

 species described by Illiger. In the LeConte collection this species 

 bears the label altemata. Dr. Kuntzen writes as follows of 

 altetmata: 



Type and three paratypes, surely all the same, Carolina, Bosc d'Antic leg. 



* * * is In the sense of G. H. Horn (1889) a form of 5-i?J< fern Say * * * 

 and is similar to the specimens named in the Berlin Museum as D. punctigera 

 Leconte from Kansas, Hamilton County 3.350 feet F. H. Snow * ♦ ♦ 

 [specimens of this same series from Hamilton County in the Snow collection 

 have been examined and are what is here identified as alternata Illiger] 



* * ♦ the black stripes of the elytra are narrow, there are only two distal 

 spots on the pronotum, a posterior part of the metasternum of crescent shape 

 is not at all or only a little darkened. Length, 7 to 8.5 mm, 



D. altemata is found from Canada to Texas and from the Atlantic 

 coast to British Columbia. In general it is a slightly larger and 

 broader species than pluriligata, but so closely resembles it that 

 often only an examination of the aedeagus will enable one to dis- 

 tinguish the two species. 



