Asilidae. 



9 



between the first and second ventral plate lies just under the row 

 of muscular impressions on the second dorsal segment; the second 

 ventral plate reaches to the end of the second dorsal ; the other 



ri. ^ /■ 

 Fig. 1. L. cylindrica. Metathorax and abdomen. 1—8 the eight dorsal segments, 

 l'—& the eight ventral segments. M.N. metanotum, M.S. metasteimum, M. mem- 

 brane, XJ. f. upper forceps, L. f. lower forceps, V. L. ventral lamella, D. L. dorsal 



median lamella. 



ventral piates are of the same length as the dorsal piates to which 

 they belong. The last segment is short, especially in the male. The 

 male genitalia are somewhat swoUen ; they consist of a large hook- 

 form ed upper forceps the arms of which are curved towards each 

 other at the apex, so that they leave a space between them; in this 

 lies the median dorsal lamelia directed more or less upwards between 

 the arms of the forceps; below the upper forceps lie the lower for- 

 ceps; the arms of the latter are somewhat bulbous at the base with 

 hook-formed, somewhat complicated apex which is hidden between the 

 arms of the upper forceps; below the lower forceps at the base lies 

 the somewhat arched ventral lamella; the lower forceps and the ven- 

 tral lamella are connected at the base. In the interior lies the penis 

 with a long, thread-like appendage which is generally (when not retracted) 

 curved down along the ventral lamella. The female genitalia consist 

 of a small, generally quite hidden ovipositor. Legs not especially strong, 

 the hind legs relatively long; the femora have only a few bristles at 

 the apex; the anterior tibiæ have some long, thin bristles on the 

 posterior side and the hind tibiæ have some similar bristles on diffe- 

 rent sides; the tibiæ have moreover some apical spurs. The tarsi 

 have strong bristles at the sides and short bristles on the lower sur- 

 face. The front and hind tibiæ have a dense pubescence apically on 

 the ventral side. The claws are relatively long and strong; there are 

 no pulvilli and the empodium is claw-shaped. Wings relatively short; 

 the subcostal cell open, the cubital vein with a long fork, the basal 

 cells of nearly equal length, the upper branch of the postical vein 

 lying close to the discai cell, thus there is no postical cross-vein; all 



