Nitidula was incorporated by Linnaeus with Silpha, from 
which it is readily distinguished ; it is nearly related to Stron- 
gylus, pi. 339, but the shape of the antennae and trophi vary 
considerably, and it differs completely from Thymalus (pi. 39) 
in all these particulars, and especially in wanting the internal 
claw to the maxillae. 
There are very remarkable differences in the ceconomy of 
this group, some living upon the pollen of the sweetest flowers, 
and others delighting in dead carcases, putrid Boleti and 
old bones. They are distributed over the whole globe, but 
Europe seems to be their metropolis, and England is rich in 
species, as will appear by the following list : 
1. decemguttata Fab. Olivier’s fig. referred to in the {e Illus- 
trations” does not agree with this species. 
2. oblonga Herb . col. v. 5. pi. 5‘Lf 4. 
3. pallescens Step. 5. 406. 
4. Silacea Herb. 5. pi. 53. f. 3. 
5. aestiva Linn. — Oliv. v. 2. no. 12. pi. 3.f. 23. 
6. villosa Thunb. — depressa III . — aestiva Fab. — Panz. 84. 7. 
7. affinis Mars. — Ste. 3. 40. 
8. melanocephala Mars. 1 36. 22. 
9. 4-pustulata Fab. — Ste. pi. 16. f. 4. — variata Ste. 3. 36. 10. 
var. ? 
10. obsoleta Gyl. — unicolor Oliv. 2. pi. 2 .f. 9. var. 
1 1. variegata Herb. 5. pi. 54. f. 3 ? 
12. fuscicollis Water. — Ste. 5. 406. 
13. impressa Kirb. — Ste. 3. 39. 
14. pusilla III— Gyl. 1. 227. 15. 
15. truncata Kirb. — Ste. 3. 39. 
16. rufipes Linn . — obscura Fab. — Oliv. 2. pi. 1 .f. 3. 
17. bipustulata Linn. — Panz. 3. 10. 
18. pygmaea Gyl. 1. 225. 13. 
19. limbata Fab.- — Oliv. 2. pi. 3.f. 18. 
20. rufomarginata Dav. — Ste. 3. 41. 
21. discoidea Fab. — Panz. 83. 5. — Sam. pi. 2 .f. 5. 
22. Colon Linn. — Curt. B. E. pi. 67 5. — haemorrhoidalis Fab. 
var. 
23. depressa Linn. — sordida Fab. — varia Oliv. pi. 2 .f. 10. 
24. grisea Linn. — Trans. Linn. Soc. v. 1. pi. 5. f. 6 — 11. 
varia Fab. — Pam. 105. 2 
25. punctatissima Panz. 25. 7. 
26. marginata Fab. — biloba Panz. 35. 10. 
The Plant is Pyrethrum Parthenium, Common Feverfew. 
