90 AMERICAN HYMENOPTERA. 



the maxillary palpi. Characteristic of svffusa is the white hair 

 covering whole of face, contrasting with the fulvous of occiput and 

 rnesothorax. The tegulse are a warm red. 



By the description, 31. intermedia Cress, comes in this group ; 

 Cresson says it may be the $ of honesta. I searched for the type 

 in the collections at Washington and Philadelphia, but without suc- 

 cess. It is a little over 11 mm. long, venter with brown pubescence, 

 whitish at extreme sides ; labrum covered with dense ochraceous 

 hairs. It can be distinguished from siiffusa thus: 

 Clypeus almost nnde; abdominal segments 2 to 4 witli narrow apical bands of 



white pubescence iiiterinedia Cress 



Clypeus covered with hair; larger (length about 13 mm.) ; abdominal segments 



2 to 4 with extremely broad apical bands of ochreous pubescence. 



suffnsa Cress. 

 Group O. 



Thorax above without black hair ; last two segments of abdomen with the hair not black. 

 Entirely dull red, legs brighter; about 14 mm. long; mandibles bidentate at tip 



(Utah) Xenoglossa ulaheii»ii!4 Ckll. 



Not so 1. 



1. Large species 2. 



Rather small species 3. 



2. Abdomen with broad white bands on segments 3 and 4, that on 2 much re- 



duced ; scape and legs red. 



.VIeiissodes inacliierantherse Ckll. 

 Abdomen with three broad grey bands; maxillary palpi 6-jointed ; hind spur 



of hind leg not hooked Tetralonia spec'iosa (Cress.l. 



Much like speciosa, but a little smaller, atid hind spur hooked at end. 



T. dilecla (Cress.). 

 Much like dilecta, but hind spur not hooked, and hair at apex of abdomen 



differently colored T. COrdleyi Viereck. 



(Compare also T. lata (Prov.), which has bands on segments 3 and 4, but 

 none on 2; segment 5 black, with a white patch on each side.) 



3. Flagellum dark, with only the faintest brown tint; niesothorax dull and gran- 



ular Tetralonia actuo!i»:i (Cress.). 



(I examined the maxillary palpi of the type of actuosa, and found them 6- 

 jointed. Compare here also T. donata.) 

 Flagellum ferruginous beneath 4. 



4. Larger; rnesothorax densely pubescent ; tegument of abdomen stained with 



red Melissudes spiS!<«a Cress. 



Smaller; niesothorax bare, except in front, shining and punctured ; third and 

 fourth abdominal segments covered with whitish tomentum. 



M. stearnsi Ckll. 

 NOTES. 



(1.) The type of M. spissa has the iiair of thorax yellow-ochreous. 

 A variety (Texas; Cresson collection) has this pubescence bright 



