ROCKY MOUNTAIN BEES 1 83 



3 Tongue elongate; parasitic bees, usually highly ornamented, and with no 

 pollen-collecting apparatus. 



a Maxillary palpi 6-jointed; a type derived from the Panurgidae, or 

 rather from an ancestral type related thereto but with three sub- 

 marginal cells; usually wasp-like in appearance, with bright yellow 

 and often red colors; three submarginal cells in all but one or two 

 species; marginal cell pointed on costa. NOMADIDAE. 



Nomada Fabr. 

 b Maxillary palpi with two to six joints; usually robust bees, with con- 

 spicuous markings due to hair, but without yellow tegumentary mark- 

 ings; a type derived from the Anthophoridae. MELECTIDAE. 



Maxillary palpi 6-jointed. Bombomelecta Patton (N.) 



Maxillary palpi 5-jointed, the last joint minute; genus parasi- 

 tic on Anthophora. Pseudomelecta Rads. (N.) 

 Maxillary palpi 3-jointed; body with conspicuous light mark- 

 ings due to appressed hairs; genus parasitic on the 

 Eucerinae. Triepeolus Rob. (N.) 

 Maxillary palpi 2-jointed; size usually smaller than in the 

 last, and silvery area on end of abdomen of female 

 much smaller. Epeolus Latr. (P.) 

 Like Epeolus, but with only two submarginal cells. 



Phileremus Latr. (P.) 

 c Maxillary palpi 5- to 6-jointed; small bees usually classed with 

 Phileremus, etc., but apparently forming a distinct group. 

 Neolarrinae. i 



Maxillary palpi 6-jointed. 



Marginal cell long, truncate at ap^x. 



Abdomen dull, constricted at the sutures. 



Neopasites Ashm. (N.) 



Abdomen shining, not constricted at the 



sutures; genus parasitic on Spino- 



liella. Oreopasites Ckll. (N.) 



Marginal cell very small and short. 



Neolarra Ashm. (N.) 



Maxillary palpi 5-jointed; only one submarginal cell; very 



minute bees. Phileremulus Ckll. (N.) 



4 Tongue very long; first two joints of labial palpi elongate, sheath-like, last 

 two minute; hairy, pollen-collecting bees, the males often with long antennae, 

 and usually with the clypeus yellow. ANTHOPHORIDAE.* 



a Paraglossae very short; form robust; Neotropical group reaching 

 the southern border of the United States. Centrinae (or Hemisiinae). 

 Maxillary palpi 6-jointed. 



Clypeus not yellow in male. Exomalopsis Spin. (S.) 

 Clypeus yellow in male; usually only two sub- 

 marginal cells. Anthophorula Ckll. (S.) 

 Maxillary palpi 4-jointed; large robust, swift-flying bees. 

 Centris Fabr. = Hemisia Klug. (S.) 

 (The Fabrician Centris was a mixture; Schrottky 

 contends that the name is not applicable to our bees.) 

 b Paraglossae medium, not or hardly exceeding first joint of labial 

 palpi. Anthophorinae. 



Maxillary palpi 5-jointed; tongue, labial palpi and maxillary 

 * blade extremely long. Melitoma Lep. & Serv. (S.) 



Ashmead, Bull. Colo. Biol. Assoc, No. 1. p. 33, i8go. 

 1 For a list of the species, see Trans. Amer. Ent. Soc. Vol. XXXII, pp. 97-104, 1906. 



