78 AMERICAN HYMENOPTERA. 



1. Apical half of abdomen black, without conspicuous (if any) light markings; 



large species ; antennae of moderate length 2. 



Apical half of abdomen with conspicuous light bands or markings due to hair, 

 or entirely fulvous 3. 



2. Hind legs with ferruginous hair comaiiche Cress. 



Hind legs with black hair caliginowa Cress. 



3. Abdomen with the general color light fulvous 4. 



Abdomen black, with a whitish hair band on segment 4, and whitish patches 



at sides of 3 ; hair of apex rufous coloradensis Cress. 



Abdomen with conspicuous whitish hair bands on segments 2-4 5. 



4. Larger; abdomen all fulvous, except a darkening at the bases of segments, 



due to tegument showing through townseiidi Ckll. 



Smaller; abdomen with the base sparsely haired and appearing black, and the 

 hair of the apical segment black moil tana Cress. 



5. Hair of abdominal venter and inner side of b. j. dark fuscous or black. 



obliqua Say. 

 Hair of sides of abdominal venter white, of inner side of b. j. ferruginous- • -6. 



6. Face narrower; tegulae light reddish ; abdominal bauds very broad. 



Siiffusa Cress. 

 Face broader 7. 



7. Tegulae dark; abdominal bands narrow; mesothorax with much black hair. 



commuitis Cress. 



Tegula" red ; larger than communis (but var. a. has stature of communis) ; thorax 



with little dark hair, and that on scutellum ; wings strongly yellowish 



(Kansas) hortivagaiD^ Ckll- 



Note. — The following should also be compared : 



(1.) M. vernonensis (Viereckj, a form from Vernon, British 

 Columbia, regarded by Viereck as a race of M. menuacha. It is 

 covered with dull white hair; abdomen very hairy ; tegulie dark, 

 covered with light hair; labrum black, with a very large yellow 

 spot. 



(2.) M. duploeincta Ckll., from Arizona, with appearance of 

 Tetralonia lippice. It has five bluish white bands on abdomen ; 

 upper lateral corners of clypeus black ; tegulae light fulvous. A 

 much more slender species than suffusa, with the pubescence an 

 entirely different color. 



(3.) M. parosetce Ckll., from New Mexico. Smaller than duplo- 

 eincta; tarsi red ; pubescence of thorax in front light fulvous; cly- 

 peus all yellow, except a black spot on each side. 



Group D. 



Clypeus and labrum light ; thorax above without dark hair ; hair of hind legs 

 black or fuscous (more or less pallid in georgica) ; abdomen not strongly 

 banded, its apex with black hair. 



