236 



EXPLANATION OF THE PLATES. 



PLATE IX. 



Fig. 



1. Labium of Ccelioxys £• 



2. Maxilla of Ccelioxys £. 

 2a. LaL rum of Ccelioxys § . 



2b. Superior plate of the apical 

 segment of C. rufescens § • 



2c. Inferior plate of the apical seg- 

 ment of C. rufescens (typical 

 form) $. 



2d. Inferior plate of the apical 

 segment of C. rufescens 

 (variety) $. 



2e. Lateral view of the apical seg- 

 ment of Ccelioxys rufescens 



2- 



2f. Lateral view of the apical seg- 

 ment of C. rufescens <$ . 



2y. Inferior plate of the apical seg- 

 ment of C. elongata $ . 



2h. Underside of the head of C. 

 elongata, var. mandibular is 



2- 



2i. Lateral view of the apical seg- 

 ment of C. vectis 2 • 



2k. Lateral view of the apical seg- 

 ment of C. vectis cS • 



21. Superior plate of the apical 

 segment of C. vectis $ . 



2m. Inferior plate of the apical seg- 

 ment of C. vectis 5 . 



2n. Inferior plate of the apical 

 segment of C. vectis, var. § . 



Fig. 

 2o. 



2 P . 



2q. 



2r. 



2s. 



2t. 



2u. 



2v. 



2iv. 



3. 

 4. 



5. 



6. 



7. 

 8. 



Inferior plate of the apical seg- 

 ment of C. quadridentata 2 . 



Superior plate of the apical 

 segment of C. quadridentata 



2- 



Lateral view of the apical seg- 

 ment of C. quadridentata § . 



Inferior plate of the apical seg- 

 ment of C. umbrina $ • 



Superior plate of the apical 

 segment of C. umbrina 2 • 



Superior plate of the apical 

 segment of C. elongata $ . 



Inferior plate of the apical seg- 

 ment of C. elongata 2 • 



Lateral view of the apical seg- 

 ment of C. elongata 2 • 



Lateral view of the apical seg- 

 ment of C. umbrina $ . 



Labium oiMelecta punctata 2 • 



Maxillary palpus of Melecta 

 punctata 2 • 



Labium of Eucera longicornis 



Maxilla of JEucera longicornis 



2- 



Labium of Saropoda bimaculata 



2- 



Maxilla of Saropoda bimaculata 



PLATE X. 



1. 



:;. 

 i. 



5. 



7. 



Labium of 



rum 2 



Maxilla of 



rum 2 



Labium of 



Labium of 



Labium of 



Maxilla of 



Maxillary 



lapidar 



Anthophora acervo- 



Anthophora acervo- 



Bombus hortorum 2 • 

 Apis mellifica £> . 

 Bombus virginalis 2 • 

 Bombus virginalis 2 • 

 palpus of Bombus 

 ius 2 • 



9. 



10 



8. Maxillary palpus of Bombus 

 derhamellus 2 • 

 Labium of Apathus campestris 



2- 



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 • 



