SMULYAN: NEW ENGLAND TENTHREDELLA. 451 
Wings. — Fore wings more often only faintly clouded. 
Length. — Females, 10.5-14.5 mm.; males, 9-11 mm. 
Redescribed from seven females and six males. 
(For remarks on this species see Constancy of Characters.) 
Habitat. — Orono, and South West Harbor, Maine (June and 
July); Intervale, and Mt. Washington, New Hampshire (June); 
Amherst, Auburndale, Melrose, and Taunton, Massachusetts 
(June to August inclusive); Florissant, Colorado (''on flowers of 
Heracleum lanatum," July, Rohwer); Alaska; Cap Rouge, Quebec 
(Provancher), and Nerepis, New Brunswick (August, Rohwer), 
Canada. 
Tenthredella mutans (Norton). 
Tenthredo mutans Norton, Trans. Amer. Ent. Soc, vol. 2, 1868-9, p. 236, n. 
23, d". 
Tenthredo mutans Provancher, Nat. Can., vol. 10, 1878, p. 201, n. 16, cf . 
Tenthredo mutans Provancher, Faun. Ent. Can., vol. 2, 1883, p. 227, n. 16, cf . 
Tenthredo mutans MacGillivray, Bull. Conn. Geol. and Nat. Hist. Surv., no, 
22, 1916, p. 90. 
The type from Canada, No. 229, is in the collection of the 
American Entomological Society, Philadelpliia, Pennsylvania, 
and was examined. 
Male. — ^ Head. — ^ Black; the following parts cream- white: 
clypeus, labrum, mandibles, lower portion of cheek and lower 
orbit, and a minute elongate spot at the summit of the inner orbit; 
antennae rufescent beneath beyond the third segment. Head 
behind eyes very slightly narrower than through them; supra- 
antennal ridges quite prominent. 
Thorax. — Black; a spot on the meta-episternum, and one on 
the posterior end of the pectus on each side of the median longi- 
tudinal suture, white. Mesoscutellum moderately convex; 
meso-episternum quite sharply pointed. 
Abdomen. — Light ferruginous; the basal tergum, the anterior 
half of the second, and a fainter band along the posterior margin 
of the latter, black. 
Legs. — Coxae and trochanters l)lack, the anterior in greater 
part beneath dull yellowish; anterior and intermediate femora 
black, the former dull yellowish and the latter yellowish brown 
