INTRODUCTORY REMARKS. 6/ 



Htta? of one family ; A. succinta belongs to another ; 

 while A. cisrulescens , cenea, and bidentata, are ge- 

 nuine Apes. Of these, Andrena hicolor is nothing 

 more than the male oi Apis thoracica, and has pre- 

 cisely the same oral organs {p) ; and Andrena lahi- 

 ata is the male of Nomada cins^ulata. The exterior 

 palpi are sexarticulate in all the Melittce (q), but 

 in Andrena cenea and ca^rulescem they consist of 

 four articulations (r), and ih A. bidentata, which, 

 if I am nojt mistaken, comes into the same subdi- 

 vision with Apis centuncularis(s), they are most 

 probably blarticulate(i). The interior palpi in all 

 the Apes here quoted have two joints only, and 

 emerge just below the apex of the exterior laci- 

 nice (u), which are here denominated set<r, but in 

 all the MelittcB above-mentionedj these palpi are 

 quadriarticulate, as I observed above, and arise from 

 the tongue just above the tube. The mandibulce, 

 in this genus, can be called " rectcE" only in the 

 Apes, in the Melittce they are usually incurvce. In 

 the latter, in one sex, they are often, but not always, 

 endentulce {x) ; but in the foriTier, their apex is 

 furnished with teeth in both(z/). His characters, 

 with respect to the maxillce or valvulce, will apply 



(p) Tab. 3. **. c. fig. 3—6. (q) Ibid. **. b. fig. 2. a. 



and c. fig. 6. a. (r) Tab. 10. *•*. c. 2. ^. fig. 3. a. 



(s) Tab. 8. **. c. 2. a. (t) Ibid. fig. 3. c. («) Ibid, 



fig. 2. //. and Tab. 10. **. c. 2. I fig. 2. a a. (.r) Tab. 4. 



**. c. fig. 3 — 8. (y) Tab. 8. **. c. 2. a. fig. 9 — 16. and 



Tab. 10. *-*, c. 2. 1 fig. 9— H. 



p 2 better 



