328 . CLASS VIII. 
Sp. Helophilus tenax, Musca tenax L., PANzER Deutschl. Ins., Heft 14, Nos. 
23, 24, SCHELLENBERG, Tab. 9, fig. 1; common with us towards autumn, 
and often mistaken by the uninformed for bees or wasps. The larva leaves 
* its hiding place in August and September, to undergo its metamorphosis in 
chinks of walls. The body of the larva of this and of other species ends 
with a long tail; hence the French name Vers @ queue de rat; they live in 
cavities of stems of trees in which water is collected, in cesspools and 
necessaries, and breathe by this tail. See GorpamEpr Melam. Nat. 1. Observ. 
2, p. 20, Tab. u.; SwaMMERDAM Bib. d. Natuur. pp. 644—646, Tab. 38, 
fig. 9; R&aumuR Jns. Iv. Pl. 20, &e. 
Volucella Guorrr. Syrphus Fasr. Antenne with dorsal seta 
plumed, mostly long. Abdomen oval or conical, thick, hirsute. 
Sp. Volucella intricaria, Syrphus intricarius (and Syrph. bombyliformis 
Fasr.), Musca intricaria L., Panzer Deutschl. Ins., Heft 59, Nos. c1, 
12, &. 
The larva of one species, of which the metamorphosis is known, lives in 
the nests of Bombus, and feeds on its larve ; this is Volucella zonaria, 
Syrphus inanis Fasr., ReauMUR Insect. 11. pp. 482—485, Pl. 33, figs. 
15—19. The body of this larva is pointed before, broad behind, with six 
rays disposed in a semicircle. They are also found in wasps’ nests. 
Pelicocera HOFFMANNSEGG, Mric. Antenne with short dorsal 
seta, incrassate, triarticulate. 
c) Wings more than twice the length of the abdomen (incum- 
bent, parallel). 
Brachyopa HorrMAnnsEecG, Meta. 
tt Proboscis elongate (of the length of head and thorax), Head 
porrect beneath into a conical beak. 
Rhingia Scov., Fasr. Wings incumbent, parallel. 
Sp. Rhingia rostrata, Conops rostrata L., PANzER Deutschl. Ins., Heft 87, 
No. 22, Dummr. Cons. gén. s. l. Ins. Pl. 47, fig. 7. 
Family XI. Zanystomata. Antenne mostly with three joints, 
the last setigerous. Proboscis exsert, containing an haustellum 
composed of four or six sete. 
Longbeaks. The larve resemble oblong worms, and have no 
feet ; they have ordinarily a horny and hard, others a soft head, 
but which is constantly provided with hooklets or retractile append- 
ages, of which they make use in gnawing or sucking their food. 
The most live underground. They moult before changing into 
v 
