414 apidjE. 



Family APID^. 



This family contains both social and non-social bees, and is 

 distinguislied by havang the tongue acute at the apex, never eman/iuKte, 

 generally narrow and sometimes remarkably long. In form and in 

 the amount and character of the pubescent covering the genera 

 vary considerably. 



Key to the Genera. 



A. Fore wing with three cubital cells. 



a. Maxillary palpi G-jointed. 



a'. Posterior tibiae densely pubescent. 

 it'-. Ocelli in a curve on vertex. 



a^. Abdomen with an anal longitudinal 

 rima ( 2 ) ; clypeus and face elon- 

 gate ( c? ) Halictus, p. 419. 



b^. Abdomen without any anal rima ( $ ) ; 

 clypeus and face not elongate {d}- 



a*. Labnmi barely exserted Nomia, p. 447. 



b*. Labrum much exserted, prominent. Tetralonia, p. 620. 

 b^. Ocelli in a triangle on vertex. 



a^. Labrum much exserted, prominent, 

 a*. First recurrent nervure in fore wing 

 received at apex of 2ud cubital 

 cell, interstitial with 2nd trans- 

 verse cubital nervure Habeopoda, p. 521. 



fe*. First recurrent ner^ ure in fore wing 



received at middle of 2ud cubital [p. 523. 



cell Anthophoba, 



b^. Labrum only slightly exserted, not 

 prominent. 

 a*. Second cubital cell in fore wing 



subquadrate Andeena, p. 440. 



Z»*. Second cubital cell elongate sub- 

 triangular, the inner angle pro- 

 duced Xylocopa, p. 533. 



b'. Posterior tibiae not densely pubescent. 

 «^. Abdomen much narrowed at base, sub- 



petiolate, and clavate Nomad a, p. 463. 



b-. Abdomen pseudosessile, not narrowed 

 much towards base. 

 a^. Ocelli in a curve on vertex ; 2nd and 

 3rd abdominal segments more or less 



laterally produced Systropha, p. 466. 



b^. Ocelli in a triangle on vertex ; 2nd and 

 3rd abdominal segments not laterally 

 produced. 

 «*. Colour generally black and red ; 

 2nd cubital cell in fore wing sub- 

 quadrate Sphecodes, p. 416. 



b^. Colour generally metallic blue or 

 green, or black with yellow mark- 

 ings ; 2nd cubital cell in fore wing 

 in shape of a truncate triangle . . Ceratina, p. 490. 



b. Maxillary palpi 6-jointed Melecta, p. 515. 



