LIBRARY

702 COLLEGE ENTOMOLOGY
does not extend backwards to the tegulre; trochanters are undivided; the hind
legs of the queens and workers in many species have specializations for collecting
and carrying pollen. Larvre apoidiform: C-shaped, legless, wrinkled, with
thin integument and a well-developed though often small head. They feed
largely upon nectar or honey, pollen, and a mixture of honey and pollen which
is usually stored for their use when needed or is supplied to them regularly from
a common source as in the case of the honeybees.
These insects are among the most important and beneficial to agriculture in
that they are responsible for the pollination of many crops that are either essential
or of great importance to the human race. To collect and transport pollen,
bees have developed very interesting and remarkable structures on the hind
legs which constitute the so-called pollen basket or corbicula.
133. Family COLLETIDJE
134.
135.
136.
137.
138.
141.
142.
143.
144. "
145. "
146. "
147. "
LIST OF FAMILIES
PROSOPIDIDlE (PROSOPIDJE, HYLlEIDJE)
DUFOUREIDlE
MACROPIDIDlE (MACROPIDlE)
HALICTIDJE (NOMIIDJE) 139. Family NOMADIDJE
ANDRENIDJE 140. MELICTIDlE
ANTHOPHORIDlE (PODALIRIIDJE, EMPHORIDlE, EUCERIDJE)
FIDELIIDJE 148. Family MELIPONIDJE
MEGACHILIDJE 149." PANURGIDlE
XYLOCOPIDlE 150. EUGLOSSIDk
CERATINIDJE (CHRYSANTHEDIDJE)
BOMB IDlE (BREMIDJE) 151. STELIDIDJE
APIDJE (STELIDJE)
KEY TO IMPORTANT FAMILIES 1
1. Tongue short, bilobed; second recurrent vein directed distad before
joining subdiscoidal vein. . 2
Tongue elongate, acute; second recurrent vein not bent or directed distad
before joining subdiscoidal vein . 3
2. Anterior wings with two submarginal cells; pubescence short, sparse;
color black with yellow markings . . PROSOPIDIDlE p.704
Anterior wings with three submarginal cells; pubescence long, dense;
color black without yellow markings . . COLLETIDlE p. 703
3. Face with distinct subantennal plates; females and some males with
impressed, pubescent facial fovere.. .... 4
Face Without subantennal plates; males and females without facial
fove