80 AMERICAN HYMENOPTERA. 



10. Hair of thorax and first abdominal segment briglit fulvous. 



T. a<«tras»liiia (Ckll.). 

 Not thus brightly c<)lored 11. 



11. Mesothoi'ax dull and granular; pubescence paler than in lepida. 



T. frater (Cress.). 

 Mesothoras shining and punctate (Kansas). 



T. gillettei Kiioviana (Ckll.). 

 (See also T. fedoris Ckll. and T. birkmanniella Ckll.) 



NOTES. 



(1.) T. intrudens (Cress.) differs from the above by having the 



labruin dark, with a large yellow spot. 



(2.) T. territella Ckll. may be looked for under 5 ; it, with the 



Californian T. actuosa (Cress.) form a little group distinguished by 



having ventral subapical teetli on abdomen, and the mesothorax 



dull. They are distinguished as follows: 



T. territella : labrum all light; margins of clypeus not black ; thin 

 whitish hair bands on abd. s. 5 and 6; rather small, pubes- 

 cence all dull white. 



T. actuosa: labrum black, with a large yellow spot ; margins of cly- 

 peus black ; thin hair band on sixth abd. s. fulvous, and 

 more on fifth. 



Group F. 



Clypeus and Idbriim I'uiht : thorax above without dark hair (a few dark hairs in 

 colorudensis) ; flagellum red or fulvous beneath (mostly Ilelissodes). 



Bather large; abdomen black, with hair bands on 4 and 5, and patch on each 



side of segment 3; mandibles with a yellow spot. 



M. coloradensis Cress. 

 Abdomen not so marked ; when bands are developed, the band on third segment 



continuous 1. 



1. Hair of thorax above white 2. 



Hair of thorax above fulvous (very pale yellowish in plenacoides) 4. 



2. Tegulse dark ; eyes green ; nervures fuscous M. lupiiia Cress. 



Tegulae light ; eyes greyish or reddish 3. 



3. Abdomen covered with short white tomentum. 



Xenoglossodes albata (Cress.). 



Abdomen with very thin loose pubescence; hind margins of segments very 



broadly hyaline; nervures light ferruginous HI. agilis Cress. 



4. Larger; about 14 ram. long; hair of abdomen pale fulvous. 



]fl. meniiacha Cress. 

 11-13 mm. long; hair of thorax above fulvo-ochraceous ; last three abdominal 

 segments with black pubescence. 



M. coinptoides Eob. (from description). 

 Smaller ; less than 12 mm. long ; apical part of abdomen 4 spinose 5. 



