NEW AND LITTLE-KNOWN AMERICAN BEES. 147 



palpi long, apparently a little longer than the fifth, fourth and fifth 

 together about as long as third ; tegulne dark ; wings clear ; abdomen 

 subglobose, black, the erect white hair covering first segment and 

 basal two-thirds of second, the apical third of second covered with 

 black hair ; third and fourth segments with short black hair, and no 

 pale hair-bands ; fifth with a subapical band of very thin light hair ; 

 sixth witli a more pronounced band or fringe ; last ventral segment 

 with the lateral margins elevated ; legs normal, hair on inner side of 

 basal joint of tarsi orange. 



Hab. Palisade, Colorado, May 7th, 1901, two males. (Colo- 

 rado Agricultural College.) 



Similar in many respects to S. edwardsii, but smaller, with 

 the third antennal joint longer, the yellow of the clypeus paler, 

 &c. The type specimen was taken by Prof. C. P. Gillette at 

 flowers of plum. 



Synhalonia trutt^e, n. sp. 



Synhalonia frater (not of Cresson), Ckll., Amer. Naturalist, 

 vol. 36, p. 815 (no description). 



df . Length about 12 mm.; black, the head, thorax, base of 

 abdomen and legs with abundant long erect greyish-white hair, not at 

 all fulvous, even on mesothorax ; eyes (dry) reddish-black ; facial 

 quadrangle broader than long ; clypeus very bright lemon-yellow, the 

 upper border narrowly black, this black broadening before it ends 

 laterally ; narrow anterior margin very pale brownish ; labrum re- 

 tracted in the specimen described; mandibles black; last joint of 

 maxillary palpi at least as long as the fifth ; antennae long, entirely 

 black, third joint of moderate length ; wings slightly dusky; abdomen 

 quite without light hair-bands ; first two segments with erect light 

 hair, but extreme apical margin of first, and base and apex of second, 

 with black hair ; last ventral segment with no distinct lateral eleva- 

 tions ; legs normal; pectinigerous spur on anterior tibia ending in two 

 long slender spines, one of which terminates the comb, while the other 

 is prolonged in the line of the spur ; hind spurs normal. Although 

 the abdomen is without hair-bands, properly speaking, the sides of the 

 third and fourth segments, viewed laterally (obliquely) show glittering 

 white hairs. This is extremely like the male of S. edwardsii, but the 

 pubescence is paler, and the second abdominal segment has it black at 

 base; the scape also is considerably less swollen. 



? . Differs from that of .V; frater by its rather smaller size ; 

 reduced abdominal hair-bands, those on the third and fourth segments 

 being narrow and more or less broken in the middle line ; apical plate 

 much more rounded, less conical in outline ; hind spur of hind tibia 

 long and straight, not curved at the tip ; mandibles without a light 

 streak. The reduced abdominal bands, the shape of the apical plate, 

 and the long straight hind spur, also distinguish it from S. belfragei. 

 The ventral abdominal segments are fringed with pale hair, greyish- 

 white at the sides, more or less fulvous in the middle. The second 

 dorsal abdominal segment has a complete transverse area covered with 

 light hair to the exclusion of the black, which is belore and behind it, 

 but this light hair is thin and erect, so that it does not seem to form 



n 2 



