86 AMERICAN HYMENOPTERA. 



5. Eyes pale grey -green ; pubescence of thorax greyish white. 



M. gleiiwoodeiisiN Ckll. 

 Eyes brown ; pubescence of thorax slightly yellowish ; abdominal bands better 



developed "M. iiieniiaclia. Cress." (a Colorado specimen so 



labelled in the Cresson collection, bnt not the si)e- 

 cies usually recognized as menuachn). 



6. Abdomen broader, with very broad bands HI. inizetc Ckll. 



Abdomen narrower, with narrow bands jfl. blsikei Ckll. 



The two following may also be compared here, bnt they are smaller species : 

 Abdomen with broad bands; sides of fifth segment without patches oi' white 

 tomentum; flagellum red beneath. 



XenoglosNodes excurreiis Ckll. 

 Sides of fifth abd. s. with patches of white tomentum ; flagellum all black. 



Tetralonia lippiee <<$eiiiilip|»i{e (Ckll.). 



Group L. 



Last two segments of abdomen with black or fuscous hair, except sometimes at extreme 

 sides; hair of thorax above with black (very little in hewetti and denti- 

 ventris). 



Hair on inner side of basal joint of hind tarsi ferruginous 1. 



Hair on inner side of basal joint of hind tarsi black or fuscous Group M. 



1. Hair of vertex without black ; larger species 2. 



Hair of vertex with black, at least at sides 4. 



2. Hair of thorax in front pale yellowish cinereous; eyes green; abdominal 



bands narrow Melissodes martini Ckll. 



Hair of thorax in front fulvous; eyes brown or greyish brown; abdominal 

 bands broad ; tegulse rufous 3. 



3. Larger; legs red; a light band iu scutello-mesothoracic suture; an oblique 



(pointed anteromesad) hair band at sides of second abd. s., the region 



below and mesad of the band hairless M. texana Cress. 



Smaller; legs black or nearly; no light band in scutello-mesothoracic suture; 

 second abdominal segment hairy right across, as in 31. snffusa. 



M. pet u lea Cress. 

 (Texana and petulca are very closely allied, but separable as indicated. M. 

 petulca, however, is a variety of su.ffusa, separable by the hair of the last 

 two abdominal segments being very dark chocolate ; the abdomen per- 

 haps averages narrower. M. petulca has priority of place over siiffusa.) 

 The following two species will be Idoked for here : 



Tetralonia fuscotiacta (Ckll.), from Arizona; hair of vertex with no black; 

 length about 11 mm., abdomen with three broad white bands; a white 

 patch at each side of fifth segment. 

 Melissodes grandissima Ckll., from Texas; very large species; flagellum dark ; 

 hair on inner side of b. j. fuscous, with some ferruginous basaliy ; legs 

 black. 



4. Hair of thorax above fulvous, with only a few black hairs; eyes light green ; 



large species fl . hewetti Ckll. 



Hair of thorax above with much black 5. 



