1979] Thorpe & Harrington — Seed-Bug Parasitism 
403 
from dissections of twenty parasitized L. diffusus. Figure 2 depicts 
the position of a mature third instar larva within an adult L. diffusus 
female. The full grown larva fills the entire abdominal cavity and its 
posterior spiracle partially protrudes into the bug’s thorax where it 
fits into a respiratory funnel (Clausen (1940) discussed the host 
tissue origins of such a respiratory funnel). The host-attached, 
narrow end of the funnel was always found lying very close to either 
the right (12 examples) or left (8 examples) metathoracic spiracle, 
and was probably attached to the spiracular stalk not far from the 
spiracle. 
1 m m 
Figure 2. Mature Catharosia sp. larva within L. diffusus female. Note respiratory 
funnel attached near host’s metathoracic spiracle (MS = metathoracic spiracle of L. 
diffusus; RF = respiratory funnel; PS = posterior spiracle of Catharosia larva). 
Figure 3. Mature Catharosia larva emerging from L. diffusus female. Larva is 
passing beneath ovipositor through cleft in center of host’s 7th abdominal sternum. 
