INTRODUCTION. 
Rot, 
A ust of the most useful books upon this tribe, or to 
which any reference is made in the following pages; a few 
words upon the history of these insects since the period at 
which Mr. Kirby published his “ Monographia Apum 
Angliz ;” an account of their external structure; and a few 
observations of a more general nature, will not perhaps be 
thought superfluous here. 
§ 2. 
Ca. Linnzxvus.—Fauna Suecica. Edit. altera. Stockholmie. 1761. 8vo. 
—Systema Nature. KEdit. 12a, Holmia. 1766—1768. 
Tom. 3. 8vo, 
Carnot pE Vitters.—Caroli Linnzi Entomologia, fauna suecice descriptioni- 
bus aucta, &c. Lugduni. 1789. 4Tom. 8vo. 
Cu. pt Geer.—Memoires pour servir a |’Histoire des Insectes. 7 Vols. 4to. 
Stockholm. 1752—1778. 
A. J. Rerzivs.—Car. de Geer Genera et Species Insectorum, extraxit digessit, 
&c. Lipsie. 1783. 8vo. 
J. C. Fasricius.—Systema Entomologiz. Flensburgi et Lipsie. 1775. 8vo. 
— Species Insectorum. Hamburgiet Kilonii. 1781. Tom. 2. 
8vo. 
—_———_ ———— Mantissa Insectorum, &c. Hafnie. 1787. Tom. 2. 8vo. 
——_——-————- Entomologia Systematica emendata et aucta. Hafnie. 
1792—1794. 4Tom. 8vo. Et Supplementum. 1798. 
8yo. 
Systema Piezatorum. Brunsvige. 1804. 8vo. 
P. Rosst1.— Mantissa Insectorum. Tom.2. 4to. Pisis. 1792—1794. 
Fr, Kruc.—Monographia Siricum Germania atque generum illis adnumera- 
torum. Berolini. 1803. 4to. Cum tab, color. 
B 
