Asilidae. 29 



metathorax is rather distinct; on the ventral side there is a large 

 metasternum, the space between it and the hind coxæ is meni- 

 branous. Abdomen long, somevvhat flat, consisting of eight segments; 

 the first dorsal segment is short, the second the longest; on the ven- 

 tral side the first segment is very small, the foUowing of nearly equal 

 length. The male genitalia I have only been able to examine in situ; 

 so far as I could ascertain there is an upper, triangular plate, foUowing 

 after the eighth segment; below and to each side of this plate there is a 

 large pair of forceps, each arm of which has an outer, rounded branch, 

 and an inner branch which is longer than the outer and forked at 

 the end, the upper arm of the fork being directed upwards, the lower 



Fig. 11. D. teutonus, front leg. X 8. 



downwards; I think this forceps answers to the lower forceps; below 

 there is a long ventral lamella terminating in a pair of lamelliform 

 styles. The female abdomen terminates in a pair of small lamellæ. 

 Legs not especially strong; front tibiæ on the ventral side produced 

 in a strong spine, the apex of which is bent strongly outwards; the 

 base of the front metatarsi has an obliquely cut part turned towards 

 the spine and this part and the inside of the spine are both serrated 

 (Fig. 11). The legs have some strong, spine-like bristles which are 

 short on the femora, longer on the tibiæ; the posterior tibiæ have 

 apical spurs. The tarsi have strong spine-like bristles at the ends of 

 the joints, the metatarsi over the whole length. Front and hind tibiæ 

 have a short dense pubescence on the ventral side apically, it is most 



