330 HYMENOPTERA ACULEATA. 



before the females. This is the history of every wood-boring 

 bee that I have bred ; and I have reared broods of nearly 

 every species indigenous to this country." The peculiarities 

 in habits of the species will be shortly noticed at the 

 end of the descriptions. Chrysis occurs as a parasite on 

 Osmia. 



(2) 1. fj, antennjB very long, not hairy, ex- 



tending to beyond the scutellum ; 

 ? with two stout horn-like j^rocesses 

 on the face ..... eupa. 

 (1) 2. (J, antennas either fringed with fine 

 hairB beneath or else not nearly 

 reaching to the scutellum ; $ face 

 simple. 



(12) 3. Calcaria of posterior tibiae black. 

 (9) 4. Abdomen black, not metallic. 



(8) h. $, posterior metatarsi, more or less 



dilated towards the apex inwardly, 



apex of abdomen bidentate ; ? , face 



with black hairs, first and second 



abdominal segments clothed with 



fulvous hairs. 

 (7) 6. $, antennas fringed with fine hairs 



beneath ; $ , face sparingly clothed 



with black hairs, basal area of pro- 



podeum dull pilicoknis. 



(6) 7. c?' antennas not fringed beneath ;$ , 



face densely clothed with black 



hairs, basal area of propodeum 



shining xanthohelana. 



(5) 8. (J, posterior metatarsi simple, apex of 



abdomen entire ; ? , face clothed 



with jjale hairs, basal segment only 



of abdomen with fulvous . . pakietina. 



(4) 9. Abdomen more or less metallic. 

 (11) 10. (J, posterior metatarsi simple; ?, 



scopa black cojrulescens. 



(10) 11. c?, posterior metatarsi toothed beneath; 



? scopa red fulviventris. 



(3) 12. Calcaria of posterior tibias pale. 



(14) 13. (J, margin of sixth segment entire; 



? , head and thorax densely clothed 

 with black hairs .... biuoi.ok. 



(13) 14. (J, margin of sixth segment denticulate 



at the sides ; $ , head and thorax 

 clothed with brown or pale hairs. 

 (16) 15. Segments of abdomen fringed with 



golden hairs aubulenta. 



(15) 16. Segments of abdomen not fringed 



with golden hairs. 



