Euspinolia militaris is a solitary parasitoid of mature larvae or pre-pupae of other insects, as is typical of mutillids, with females using the ovipositor both to insert eggs into host brood cells and for defense. Like other mutillids, males are presumed to lift females during mating and copulate while airborne. After mating, the female enters an underground bee or wasp nest where she lays an egg, and the mutillid larva feeds on the host larva and eventually kills it.
Stridulation The species produces sound in response to threats from potential predators via
stridulation, as do other mutillids, though this species is unusual in having a strong ultrasonic component to the sounds it produces. Compared to other mutillids studied, the distress stridulation emitted by
E. militaris has a larger number of pulses and a longer duration in the forward notes. Additionally, its chirp durations and repetition intervals are longer and emitted at lower rates. == References ==