236 



EXPLANATION OF THE PLATES. 



PLATE IX. 



Fig. 



1. Labium of Ccelioxys 2 . 



2. Maxilla of Coelioxys $ . 

 2a. Labium of Coelioxys 2 • 



2b. Superior plate of the apical 

 segment of C. rufescens 2 • 



2c. Inferior plate of the apical seg- 

 ment of C. rufescens (typical 

 form) 2 • 



2d. Inferior plate of the apical 

 segment of C. rufescens 

 (variety) <j>. 



2e. Lateral view of the apical seg- 

 ment of Ccelioxys rufescens 



$• 



2/. Lateral view of the apical seg- 

 ment of C. rufescens $ . 



2g. Inferior plate of the apical seg- 

 ment of C. elongata 2 • 

 Underside of the head of C. 

 elongata, var. mandibularis 



$. 

 Lateral view of the apical seg- 

 ment of C. vectis 2 - 



2k. Lateral view of the apical seg- 

 ment of C. vectis $ . 



21. Superior plate of the apical 

 segment of C. vectis $ . 



2m. Inferior plate of the apical seg- 

 ment of C. vectis 2 ' 



2n. Inferior plate of the apical 

 segment of C. vectis, var. $ . 



2h 



21 



Fig. 



2o. Inferior plate of the apical seg- 

 ment of C. quadridentata 2 • 



2p. Superior plate of the apical 

 segment of C. quadridentata 



$• 



2q. Lateral view of the apical seg- 

 ment of C. quadridentata 2 • 



2r. Inferior plate of the apical seg- 

 ment of C. umbrina 2 • 



2s. Superior plate of the apical 

 segment of C. umbrina 2 • 



2t. Superior plate of the apical 

 segment of C elongata 2 • 



2u. Inferior plate of the apical seg- 

 ment of C. elongata 2 • 



2v. Lateral view of the apical seg- 

 ment of C. elongata 2 • 



2w. Lateral view of the apical seg- 

 ment of C. umbrina 2 • 



3. Labium of Melecta punctata 2 • 



4. Maxillary palpus of Melecta 



punctata 2 • 



5. Labium of Eucera longicornis 



$• 



6. Maxilla of Eucera longicornis 



?• 



7. Labium of Saropoda bimaculata 



$• 



8. Maxilla of Saropoda bimaculata 



PLATE X. 



1. Labium of Anthophora acervo- 



rum 2' 



2. Maxilla of Anthophora acervo- 



rum 2> 



3. Labium of Bombus hortorum 2 • 



4. Labium of Apis mellifica $ . 



5. Labium of Bombus virginalis 2 • 



6. Maxilla of Bombus virginalis $ . 



7. Maxillary palpus of Bombus 



lapidarius $. 



8. Maxillary palpus of Bombus 



derhamellus 2> 



9. Labium of Apathus campestris 



?• 



10. The relative proportions of the 



labium and' labial palpi of 

 Bombus lapidarius. 



11. The relative proportions of the 



labium and labial palpi of 

 Bombus derhamellus 2 • 



