AMERICAN COLEOPTERA. 59 



irroup ; differs from the former by the elytra l)ein<i- less strongly punc- 

 tured, and not striate; from both by the arrangement of the colors of 

 tlio elytra, which are yellow, with a broad common sutural black vitta, 

 and a broad dorsal vitta extending from the base nearly to the tip ; or 

 they may be described as black with a narrow dorsal vitta, the lateral 

 and apical margins yellow. 



D. virgifera, pallide liava, oro. occ'iiute,antennis, sciitcllo, llo^;tpocto^is l;Uc- 

 ribus. fomoriim linea superna, tibiis tarsisque infuscatis; prothorace quadrato, 

 lat.itudine vix longioro lateribus fortiter marginatis subsinuatis, angulis fere 

 rectis.dorso bifoveato : elytris vitta communi suturali, altoraque iitrinqiie ab 

 liumero fere ad apicetn extensa nigris, siibtiliter puiictatis, striis, (vel pot.ius 

 suleis), sat profuudis impressis, lateribus fortiter marginatis; antennarum ar- 

 ticulo.Sio praecedente sesqni longioro, 4to tamen vix dimidio aoquaute. Long. 

 i) — fi mm. 



Two specimens found on the wild gourd near Fort Wallace. This 

 species is intermediate both by the sculpture and the relation of the 

 antennal joints between those of group 3 and 4, though rather to be 

 classed with the latter because the striaj of the elytra are more 

 grooves than stride, and are not marked with rows of punctures ; the 

 elevated ridge next the margin is more strongly marked than the 

 inner ones. The antennte are three-fourths ihe length of the body, 

 the 2d joint is about two-thirds as long as the 3d. but the latter 

 is only one-half as long as the 4th; all the joints are dark colored 

 except the 1st, which is testaceous, with a dirk line above. 



COLEOPTERA of the U. S. Coast Survey expedition to Alaska, 

 under charge of Mr. George Davidson. 



BY JOHN L. LKCONTE. M. I). 



I have recently received from Mr. George Davidson of the V. S. 

 Coast Survey a small collection of insects made by him an<l his assist- 

 ants Dr. Albert Kellogg, and ^[r. W. G. W. Harford, during his re- 

 cent very successful exploration of our newly acquired territory, Al- 

 aska. Although the number of new species is not large. I hiive thought 

 it desirable to make known the results as speedily as possible, in order 

 that encouragement may be given to chiefs of other parties who may 

 be placed in a position to do service to collateral sciences by knowing 

 that their labors are fully appreciated ; and that those who are not ex- 

 jiosed to the toils and dangers of field sei'vice, will not permit the results 

 their work to be lost. It has been my privilege on former occasions, 

 to acknowledge my obligations to Mr. Davidson for large and valuable 

 collections from our Pacific States. The collection contained, besides 

 species of hymenoptera. hemiptera and diptera, 6S species of Coleop- 



