Hymenoptera. 29 



91. Fore wings with the second cubital cell petiolate, rarely triangular; meso- 



pleural furrow wanting or indicated only anteriorly .................... 92 



Fore wings with the second cubital cell broadly sessile, not triangular, receiv- 

 ing both recurrent nervures; mesopleural furrow complete, usually deep 

 (PI. 3, fig. 56). (Pseudoplisus, Gorytes, Hoplisddes.) ...... GORYTIDjE 



92. Metathorax with the upper hind angles acute or produced as stout spines ; pro- 



notum short medially, strongly transverse; short, stout species. (Nysson, 

 Brachystegus) ......................................... NYSSONDXE 



Metathorax with the hind angles rounded or obtuse; pronotum subquadrate; 

 slender species. (Alyson, Didineis) ...................... ALYSONID^E 



93. Hind tibiae without apical spurs; eyes hairy; marginal cell very long. (PL 4, 



fig. 81; PL 5, fig. 91.) (Apis [A. mellifera, Honey-bee]) ........... APEX 



Hind tibiae with apical spurs .......................................... 94 



94. The cheeks separating the eyes from the mandibles longer than the pedicel of 



the antennae; social bees; large, densely hairy species with contrasting black 

 and yellow or sometimes also orange pile. Bumble-bees. (B6mbus,Psithyrus) 



Eyes nearly or quite reaching to the base of the mandibles; solitary bees of 

 different appearance .............................................. 95 



95. Tongue short, broad, obtuse and emarginate at apex (COLLETIFORMES) . . 96 

 Tongue more or less elongate, pointed and not emarginate; no ventral abdom- 



inal brush of hairs. (ANDRENIFORMES) .......................... 97 



Tongue long and very slender. (PL 5, fig. 91.) .......................... 99 



96. Black bees with little hair; fore wings with only two cubital cells; face almost 



always with yellow or white markings; nearly always small species. (Pro- 

 sdpis) ................................................ PROSOPHXiE 



Hairy bees; fore wings with three cubital cells; moderate-sized species. (Col- 

 Idtes) ................................................ COLLETIDjE 



97. Tongue more or less short, dagger-like; radial cell pointed; usually three cubital 



cells; maxillary palpi six-jointed; burrowing bees. (Andrena, Halictus, 

 Augochl6ra, Agap6stemon, SphecSdes.) ................... ANDRENID^) 



Tongue elongate, though not so long as in some of the higher groups ; only two 

 submarginal cells (except in Protandrena which has three) ; never brilliantly 

 metallic, though rarely with the head and thorax green; often with yellow 

 markings. (Panurgus) ................................ PANURGIDjE 



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

 len-collecting apparatus ........................................... 98 



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

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

 tennae, and usually with the clypeus yellow. Melissddes, Anthophora, 

 Hemisia (= Centris), Diadasia) ..................... ANTHOPHORID^E 



98. Maxillary palpi six-jointed; usually wasp-like in appearance, with bright yel- 



low and often red colors; almost always with three cubital cells; marginal 

 cell pointed on costa. (N6mada) .......... ............... NOMADIDjE 



Maxillary palpi two- to six-jointed; usually robust bees with conspicuous mark- 

 ings due to hair, but without yellow tegumentary markings. (Epeolus, 

 Triepeolus, Bombomelecta, Neopasites.) .................. MELECTIIXE 



