412 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
Length. — 11-11.5 mm. 
Rcclescribed from two specimens. 
All specimens of this species which I have seen (and two of 
which are here described) though fairly constant in themselves, 
differ somewhat from Kirby's description of the type specimen, 
but Mr. S. A. Rohwer of the United States National Museum 
who has seen the type, assures me they are the same. 
Habitat. — New Hampshire; Maine (July); New York; River- 
ton, New Jersey (Viereck); Sitka, Seldovia, and Kukak 
Bay, Alaska (June and July) ; Newfoundland (April, W. F. Kirby). 
Tenthredella flavomarginis (Norton). 
Allantus flavomarginis Norton, Boston Journ. Nat. Hist., vol. 7, 1860, p. 254, 
n. 35, 9 . 
Tenthredo flavomarginis Norton, Trans. Amer. Ent. Soc, vol. 2, 1868-9, p. 238, 
n. 30, 9 . 
Tenthredo flavomarginis MacGillivray, Bull. Conn. Geol. and Nat. Hist. 
Surv., no. 22, 1916, p. 90. 
The type is lost. There is an authentic female specimen, 
howeyer, in the Norton Collection in the Peabody Museum, 
Yale University. Type locality, Farmington, Connecticut. 
Female. — Head. — Black; the following parts yellow: clypeus, 
labrum, mandibles, a large spot touching eye or the whole lower 
portion of cheek, and a minute elongate spot at the summit of the 
inner orbit. Head behind eyes very slightly wider than through 
them; supra-antennal ridges quite prominent; antennae fairly 
long but stoutish. 
Thorax. — Black; the following parts yellow: posterior dorsal 
margin of lobes of collar rather broadly, tegulae, a very small spot 
sometimes on the lower margin of the lateral face of the prono- 
tum, a very small spot sometimes on the margin of the meso- 
epimeron in front of the meta-episternum, the upper margin of 
the meta-epimeron sometimes in part, and sometimes a large spot 
on the meta-episternum, and the upper portion of the meta- 
postscutellum sometimes. Mesoscutellum moderatelj^ convex; 
meso-episternum moderately pointed. 
Abdomen. — Black; basal tergum with its sides and usually 
its posterior margin straw color. 
