138 BROOKLYN MUSEUM SCIENCE BULLETIN 3. 3. 
Prothorax generally not wider at apex than long; anterior angles 
distinct, occasionally prominent; posterior angles not or feebly promi- 
nent; lateral tubercles distinct but laterally generally feebly prominent, 
separated from the disk by a shallow, densely rugose impression; sides 
below the tubercles distinctly and sometimes strongly converging towards 
base; median line rarely distinct, usually vague; anterior impression 
absent; posterior impression more or less distinct; surface generally 
finely punctate, occasionally a few of the punctures larger, caused by 
the confluence of two or three of the smaller punctures, punctures denser 
and more or less transversely and longitudinally confluent at apex, 
towards base and along the median line, on each side of the latter generally 
a smooth space of variable size either without or with a few punctures. 
Elytra without any impressions or occasionally a feeble ante- 
median impression on each side; serial punctures rather small; surface 
with a few transverse rugae; intervals smooth or distinctly punctate; 
lateral margin from a postero-lateral view acute in more than basal half, 
towards apex it is transversely arcuate. 
Body below closely but not densely punctate, pubescence short 
and sparse; side pieces of prosternum finely rugose; posterior femora 
reaching to about the apex of the third ventral segment, armed below 
with a small tooth, which is generally absent in the females and occa- 
sionally in the males. Length: 5-7.5 mm. 
Male: First ventral segment more or less distinctly excavated at 
middle; last ventral segment feebly depressed at middle; last dorsal 
segment truncate at apex. 
Female: Last ventral and dorsal segments arcuate at apex; lower 
vaginal plate similar in form as in emarginata but relatively a little 
broader. 
Hudson's Bay: "Huds. B." (Brit. Mus. Nat. Hist., Fry coll.). 
Ontario: Toronto (Crew, Cornell Univ.); Mt. St. Hilaire (Chagnon). 
Quebec: Montreal (Winn, Chagnon) ; Joliette (Chagnon) ; Oka (Chagnon). 
Maine: Wales, July (Frost); Cumberland, July (Nicolay) ; Greenville, 
June (Frost). 
Massachusetts : Framingham, May (Frost) ; Southboro, May (Frost) ; 
Hopkinton, June (Frost). 
New Hampshire: White Mts. (Hubbard and Schwarz, Nicolay); North 
Conway (Roberts); Walpole, May (Frost). 
Connecticut: Cornwall, June (Chamberlain). 
New York: Keen Valley, June (Notman) ; Portage, May (Knight); 
McLean, July (Corn. Univ.); Mud Creek, June (Corn. Univ.); 
Tarbel, June (Davis); West Point, May (Robinson). 
