84 KING AID [344] 



In presenting this paper, the writer wishes to thank the au- 

 thorities of the U. S. National Museum, especially Dr. L. O. 

 Howard and Mr. William H. Ashmead, for many kindnesses, 

 including access to the library and collection and other facilities 

 for research. Thanks are due also to Dr. Henry Skinner and 

 Mr. William J. Fox, of the American Entomological Society for 

 the opportunity of studying the Hymenoptera in the collection 

 at Philadelphia. 



Family LYDID^. 



ITYCORSIA MARGINIVENTRIS. 



Itycorsia marginiventris Cresson, Trans. Amer. Ent. Soc, viii, p. 29, 1880. 

 (Lyda.) 



A specimen of Itycorsia taken at Sitka, Alaska, June 15, agrees 

 with the type of this species except in a few trifling details of colora- 

 tion. In the Sitka example the spot on the pleura is much more ex- 

 tensive, the bands on the venter of the abdomen are reduced to mere 

 spots at the sides, the femora are black with a reddish spot at apex, 

 and the tibiae and tarsi are rufous. This species was originally de- 

 scribed from New York. 



CEPHALEIA NIGROPECTUS. 



Cephaleia nigropectus Cresson, Trans. Amer. Ent. Soc, viii, p. 32, 1880. 

 (Lyda.) 



One female taken at Sitka, Alaska, June 15. This species was 

 originally described from Nevada. 



CEPHALEIA sp. — ( .? ) . 



A representative of this genus was taken by Mr. Charles Palache on 

 Kadiak Island, but is in too poor condition for determination. 



BACTROCEROS SITKENSIS sp. nov. 



Female : Length 10 mm ; antennae of moderate length, about 

 twenty-five jointed, slender, tapering, third joint longer by one third 

 than the fourth. Color black; flagellum of antennae honey yellow; 

 abdomen except basal plates sanguineous ; anterior margin of clypeus, 

 two closely united spots just anterior to the front ocellus, fine wavy 

 line partially surrounding the anterior ocellus, spot extending inwards 

 from the middle of eye, small spot between this last spot and the base 

 of the antennae, large spot extending from the inner posterior margin of 



