Asilidae, Assassin Robber Fly

Other studies conducted by Dennis, D. and Lavigne,(1975) have shown that the ratio between the size of the prey and the asilid varies from 1.8:1 to 3.7:1, with an average of 2. 6:1. The ratio tends to increase with decreasing size of the predator.
Egg-laying takes place, according to the species, with three different behaviors which relate to the structure and the morphology of the abdomen. Females with an undifferentiated ovipositor release eggs randomly and independently from the substrate. In other cases, however, the abdomen bears a differentiates, specialized ovipositor to lay eggs in the soil or sand, or lay them in cavities within plant tissues.