INSECTA HYMENOPTERA. 



Order-HYMENOPTERA. 



Four naked, membraneous, unequal, few- veined wings. Mandi- 

 bulate ; labium and maxillse forming a suctorial proboscis. Pupa 

 incomplete, inactive. 



Sub-Order— MELLIEEEA (BEES). 



Neuters winged. Basal joint of the posterior tarsi dilated, 

 adapted for collecting and carrying pollen. Females armed with a 

 sting. 



Family— ANDEENID^. 

 Mentum elongated. Tongue short ; labium small at its extremity, 

 and either spear-shaped or cordate, with a small ear-shaped lobe on 

 each side ; labium and terminal and maxillary lobes not forming an 

 elongated proboscis. No neuters. Living solitary in burrows. 



A. Three submarginal, or cubital, cells in the wing. 



a. Marginal cell rounded at the extremity. 



1. Spine of posterior tibiae with a row of teeth. Lam- 



procoUetes. 



2. Spines of posterior tibiffi simple. 



Third joint of maxillary palpi equal to the second. 



Leiopi'octus. 

 Third joint of maxillary palpi shorter than the 



second. Dasycolletes. 



b. Marginal cell pointed at the extremity. Halictus. 



B. Two submarginal or cubital cells in the wing. Prosopis. 



Genus-LEIOPEOCTUS. 



Smith. 



Head transverse, nearly orbicular, about the width of the thorax; 



antennae placed on a slight curve on the vertex ; mentum of moderate 



length, about three-fourths longer than the labium ; the latter cmar- 



ginatc at the apex, and having at about half its length a transverse 



