404 AMERICAN HYMENOPTERA. 



Legs. — Coxae sometimes entirely black, but the middle and hind pair 

 usually with some light pile; trochanters usually with more or less 

 light hair on their lower sides, but the fore and middle pair sometimes 

 entirely dark ; fore femora often entirely dark, but usually with more or 

 less light pile; middle and hind femora always bearing a large amount 

 of light, usually whitish, pile; fore tibiae sometimes almost entirely 

 dark, but very often with a considerable amount of light ferruginous 

 pile on their hind sides, especially toward their apices ; middle tibiae 

 occasionally entirely dark, but usually with more or less ferruginous 

 pile on their hind sides, at least toward their apices ; nair on outer 

 faces of posterior tibiae sometimes entirely dark, but usually a good 

 share of it more or less strongly ferruginous. 



Dimensions. — Length: queen, 17 mm. to 22 mm.; worker, 12 mm. 

 to 17 mm. ; male, 14 mm. to 23 mm. Spread of wings: queen, 41 

 mm. to 45 mm. ; worker, 30 mm. to 41 mm. ; male, 35 mm. to 44 

 mm. Width of abdomen at second segment : queen, \Q\ mm. to 12 

 mm. ; worker, 5 mm. to 9 mm. ; male, 7 mm. to 8 mm. 



Redescribed from many specimens of each sex. 



Habitat. — This species is common throughout the United 

 States, east of the Rocky Mountains, except in some of the 

 most northern ones ; rare in southern Maine and probably 

 absent in the northern part ; fairly common in southern New- 

 Hampshire, but probably absent in the northern part (my 

 most northern record is Hanover, in the Connecticut River 

 Valley); rare in Vermont and probably absent in the Green 

 Mountains ; probably absent in northern Michigan and north- 

 ern Minnesota. Is it present and, if so, rare or abundant in 

 northern Wisconsin, North Dakota and northern Montana ? 

 It is present, but apparently rather rare, in southern Ontario 

 (my most northern record being " Ottawa " ). Bowles has 

 recorded it from Montreal. Is it present in southern Assi- 

 niboia ? It is fairly abundant at least in certain parts of the 

 eastern two-thirds of Mexico (my most southern record is 

 Oaxaca) and seems to be mainly an Upper and Lower Aus- 

 tral form, but it runs over into the Transition Zone consider- 

 ably. I have three questionable records as follows : a male 

 from California, a male from Washington and a female from 

 Oregon. Certainly, if present at all west of the eastern 

 border of the Rocky Moutains, it is extremely rare there. 

 It is present in eastern New Mexico, eastern Colorado and 



