43 



taken. In these situations they will be found 

 extremely active in their movements, and it will 

 require considerable dexterity to catch them. 

 The forceps is the only instrument that can be 

 of service close to the banks, but the clap net 

 will be useful for stragglers. 



Some species of hees are subject to the attack 

 of a most singular parasitic insect, {Stylops 

 MelittcE, plate, fig. 4.) which, from its rarity, 

 and the singularity of its history, is a most inter- 

 esting and desirable insect} the first hee it was 

 found on was the MeHttce nigrocenea^ o^ Kirby, 

 {Andrena of authors, plate, fig. 5.) but it has 

 since been discovered on several other s])ecies *. 

 The grub of it, (like the Ichneumonidce larva; in 

 caterpillars) actually exists in the internal parts 

 of the bee ; and, when ready to assume its per- 

 fect state, works its way out between the dorsal 

 segments of the abdomen ; (plate, fig. 5. a. a.) 



* This insect was first taken by A. H. Haworth, Esq. 

 F.L.S., flying in his garden at Chelsea ; and the Rev. 

 William Kirby, F.L.S., afterwards found it on the above 

 mentioned bee. For a very full and interesting account 

 and figures of the dissections of this singular and inter- 



