146 BEES OF GREAT BRITAIN. 



long again as the superior one : this of course only applies to 

 the females the males have no such marked distinctive differ- 

 ences, and are much more puzzling and difficult to determine ; 

 some characters will however be found in the number, fibrin and 

 situation of the teeth which arm the apical segments. The value 

 of the form of the ventral plates as a specific character has been 

 tested by an examination of upwards of three hundred indivi- 

 duals of C. umbrina, also of seventy examples of C. Vectis : 

 this character appears to be the best hitherto discovered. 



1. Ccelioxys qnadridentata. 



C. atra ; scutello utrinque dentato, margine postico obtuse sub- 

 angulato ; abdomine conico, segmentis margine albidis ; ano 

 maris dentato. 



Apis quadridentata, Linn. Faun. Suec. 1703 ; Syst. Nat. i. 958. 29, 

 S{ Cab. Mus. Linn. Soc. 



Fabr. Syst. Ent. p. 386. 49 ; Ent. Syst. ii. 340. 112. 

 Panz. Faun. Germ. 55. 13. 

 Apis conica, Linn. Faun. Suec. no. 1705 ; Syst. Nat. i. 958. 32, 8f 



Cab. Mus. Linn. Soc. 



Anthophora quadridentata, Fabr. Syst. Piez. p. 379. 32. 

 Anthophora conica, Fabr. Syst. Piez. p. 380. 33 <J . 

 Megachile conica, Latr, Hist. Nat. 53. 4. 

 Ccelioxys conica, Latr. Gen. Crust, et Ins. iv. 167 ? 



Zett. Ins. Lapp. p. 468. 1 ? 

 Coelioxys quadridentata, Smith, Zool. iii. 1151. 

 Ccelioxys acuta, Nyland. Ap. Boreal, p. 250. 1. 



Female. Length 5 lines. Black ; head and thorax roughly 

 punctured, the face with a yellowish-white pubescence, the 

 anterior margin of the clypeus having a dense pale fulvous 

 fringe ; the eyes pubescent. Thorax : the posterior margin of 

 the scutellum obtusely angulate and armed on each side with a 

 short tooth ; the wings fusco-hyaline, their margins clouded. 

 Abdomen shining, having scattered deep punctures ; the apical 

 segment very closely and finely punctured, subopake, and having 

 a slight longitudinal carina, the apex of the segment lanceo- 

 late ; the ventral plate lanceolate, elongate, produced beyond 

 the superior plate, and having a lanceolate appendage at the 

 apex. B.M. 



Male. Length 4 lines. Black, punctured as in the other sex, 

 the face having a dense silvery- white pubescence; the thorax 

 as in the other sex ; the apical segment of the abdomen pro- 

 duced into two stout bifurcate appendages, having on each 

 side at their base a stout straight acute tooth. B.M. 



