258 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.40. 



Female. — Length about 1(H-11^ mm.; black, robust, the small 

 joints of tarsi ferruginous, and the hind margins of the abdominal 

 segments variably reddish; face all black; mandibles with a large 

 apical orange patch; clypeus strongly and densely punctured; 

 flagellum dark, at most faintly reddish beneath; hair of scutellum 

 a lively je\\o wish-fulvous ; hair on inner side of hind basitarsi ferru- 

 ginous; abdomen well punctured as in the male; basal band on 

 second segment very narrow in middle, those on third and fourth 

 broad and pale, especially that on fourth, which is almost silvery 

 white and covers the margin of the segment; hair on fifth segment 

 and apex dark reddish chocolate, but that at sides of fifth broadly 

 pale. 



Habitat. — Type male and three others (1 male, 2 females) from 

 Japan (Mitsukuri). Also two of each sex from Tokyo, Japan, Sep- 

 tember, 1892; one male is dated September 26. 



Related to T. nipponensis, but uniformly smaller, with the abdomen 

 more strongly punctured, and the third antemial joint of the female 

 rather shorter in proportion. 



Type.— Cat. No. 13541, U.S.N.M. 



TETRALONIA NIPPONENSIS (Perez). 



Described by Perez as a Macrocera. I believe my identification is 

 correct, although the mandibles of the female have a subapical 

 orange mark, whereas Perez describes them as entirely black. In 

 the female the dark red hair at bases of segments 2 to 4, and the fine 

 orange-fulvous covering the fifth, are especially characteristic. The 

 material consists of three males and two females, labeled Japan 

 (Mitsukuri). 



TETRALONIA CHINENSIS Smith. 



Twenty-two males and eight females from Pekin, China, April 20 to 

 30, 1901 (M. L. Robb). Smith described only the male; the female 

 is much like that of T. nipponensis, but easily separated by the black 

 hair at the bases of the abdominal segments. The fifth segment has 

 the hair white at sides and dilute chocolate in the middle. The 

 clypeus is densely and coarsely punctured. There are three white or 

 greyish-white abdominal hair bands. 



Knuth l records T. chinensis from Japan, and gives jioralia Smith 

 and sociabilis Smith as synonyms. T. Jioralia is quite distinct from 

 chinensis, while sociabilis belongs to the genus Eucera. 



The following key separates the above three species: 



Males 1. 



Females; hair on inner side of hind basitarsus bright ferruginous 3. 



iThe record appears in the last volume of Knuth's Bliilenbiologie, edited by Dr. E. Loew. While 

 Knuth collected the material on which the record was made, he was, I suppose, in no way responsible 

 for the erroneous synonymy. 



