66 AMERICAN HYMENOPTBKA. 



(2.) I cannot separate the females of sviithii (from Dacota) and 

 ivalshii (from Illinois) ; bnt the males are readily separated. Town- 

 send's S "ivalshii," recorded from Vega S. Jose, New Mexico, is 

 really smithii. A cardui Ckll. differs from smithii in the color of 

 the pubescence, but I now believe that it is only a variety. In the 

 clypeal marking it agrees with smithii, not with xvaUhii ; my 

 former statement to the contrary arose from a misunderstanding of 

 "spots" in Cresson's account of wa Is Mi. 



(3.) The type of californica is an unusually small male. The 

 New Mexico "californica" (of Trans. Am. Ent. Soc, xxiv, 155) is 

 to be referred to texana. 



Group D. (Subg. no v. Micranthophora, type curta.) 



Small species, less than 11 mm. long (about 11 mm. long in 9 anstrutheri), with grey 

 or whitish pubescence, and no tegumentort/ color bands. 



Hair of thorax above black or mixed with black®. 1. 



Hair of thorax above witliout black. 6. 



1. Clypeus white in '^,witb a white apical baud in 9; eyes, dark purplish; 



hair of thorax above pale grey, with a moderate amount of black inter- 

 mixed ; size larger than A. exigua pliena.i^ Ckll. 



Apical band or other marking of clypeus light yellow. 2. 



2. Females ; apical patch of hair on fifth abdominal segment black. 3. 



Males. . 5. 



3. Small ; tlagellum bright red beneath petrophiia (Ckll.) 



Larger; flagellum all dark 4. 



4. Bases of abdominal segments nude, and appearing black; hair on inner side 



of basal joint of hind tarsi ferruginous Ciirta Pro%^ 



Bases of abdominal segments covered with hair, which is rather yellowish ; 

 hair on inner side of basal Joint of hind tarsi black or brown-black. 



anstrutheri Ckll. 



5. Hair of mesothorax practically all black; of metathorax white, without any 



black; apical band on clypeus light yellow; a transverse supracly- 

 peal mark ; anterior edge of labrum with a median process; apex of 



abdomen bidentate exigua Cress. 



Hair of mesothorax white or whitish, with only a moderate amount of black 

 intermixed ; no supraclypeal mark Curia Prov. 



6. Middle tarsi enormously elongated ; middle femora with apical half bright 



red ; anterior tarsi distorted 7. 



Legs not so. .......; 8. 



7. Eyes green ; seventh abdominal segment with a black lobe on eacli side. 



fle.vipeN Cress. 



Eyes yellow ; i>nbescence whiter than in flexipes, and apical teeth of abdomen 



shorter, and not diverging at apex, as they do in flexipes. (Denver, 



Colo.) albata Cress. 



*The type of A. petrophila has the thorax denuded, so the name is given under 

 both categories. 



