no. 1818. BEES IN THE NATIONAL MUSEUM. 2—COCKERELL. 257 



Male. — The male varies greatly in size (length 1H-13 mm.) and in 

 the color of the pubescence, which may be rich fox-red or pale gray on 

 the vertex and thorax above. The abdomen is described by Smith 

 as without bands, but in good specimens there are very distinct 

 creamy-white to fulvous hair bands at the apices of segments 2 to 4, 

 the abdomen looking like that of E. cinerea Lepeletier. The mandi- 

 bles have no yellow spot. 



Habitat.— Pekin, China, April 20, 21, May 11, 12, 14, 1901 (M. L. 

 Robb). 



I thought at first that this was a new species, but fortunately I have 

 a pair of E. sociabilis cotypes from Hiogo, Japan, from F. Smith's 

 collection, and upon close comparison they are evidently conspecific 

 with the insect from Pekin. The cotype male is, indeed, without 

 distinct abdominal bands, but they appear to have been worn off, 

 as is the case with nearly all the hair on the mesothorax and scutellum. 

 In consequence of the difference in condition, the Chinese and 

 Japanese specimens seem on superficial examination to be quite 

 different things. Smith himself stated that E. sociabilis occurred 

 also in China and Siberia. The females seen by me are quite uniform, 

 but the males vary much. It is just possible that these males rep- 

 resent more than one species, but I can not find any tangible struc- 

 tural differences, and similar variation is well known in other 

 Eucerine bees. 



In spite of the difference in venation, Tetralonia is much nearer to 

 Eucera than to Mclissodes. Eucera, with two submarginal cells, is 

 abundantly developed in Europe, but becomes scarce in eastern Asia, 

 and fails to occur in America. 



TETRALONIA MITSUKURII, new species. 



Male. — Body and antenna? each about 9 mm. long; black, the tarsi 

 beyond the base ferruginous; clypeus, labrum, and large spot on 

 base of mandibles yellow; apical part of mandibles with an orange 

 patch; maxillary palpi pale, the third joint long, the three last 

 minute; antenna? long, the flagellum slender, crenulated, ferruginous 

 beneath, varying to black with the faintest red tinge; third antennal 

 joint very short; hair of head and thorax pale to rather bright 

 ochreous above, white below, no dark hair intermixed; mesothorax 

 and scutellum strongly punctured, but smooth and shining on disk, 

 the mesothoracic punctures here widely separated; tegulse clear 

 rufotestaceous; legs with pale hair; middle and hind tarsi slender; 

 wings faintly dusky, nervines ferruginous; abdomen well punctured, 

 especially the first two segments; hind margins of segments very 

 narrowly dark rufous, the punctures coming almost to the margin; no 

 apical hair-bands, but broad pale grayish-ochreous basal ones; sixth 

 segment with the hair usually redder. 

 80796°— Proc.N.M.vol.40— 11 17 



