166 
Psyche 
[June 
Popham (1961) described the club-shaped structure of Corixa 
as being covered with hydrofuge cuticle. The scanning electron 
microscope shows that in Hesperocorixa both the club-shaped 
and the flask-shaped bodies are covered with short, densely-packed 
projections with rounded tips. The projections are approximately 
0.2 to 0.5pm in diameter and give the surfaces of these structures 
a granular appearance. The base of the club-shaped body has a 
distinctive pattern; its granular surface is subdivided, by low 
grooves, into hexagonal facets (Fig. 33). This pattern was not 
observed elsewhere on the scolopophorous organ. 
The mesothoracic scolopophorous organ of Diaprepocoris is 
considerably simpler than that of Hesperocorixa. The sensory 
membrane bears a central, roughly spherical sclerite (Figs. 25, SC; 
Fig. 32), which is darkly pigmented and approximately 100 pm in 
diameter. It projects laterally and somewhat ventrally from the 
Fig. 30. H. interrupta; collar-like network of trabeculae surrounding orifice 
of right first abdominal spiracle, located in thoracico-abdominal membrane (top 
of figure). Spiracle lacks an inner membrane and is widely open. Top of figure is 
dorsal, right side is anterior. Scale line = 50 yum. 
Fig. 31. M. sedula ; right mesothoracic scolopophorous organ and metathoracic 
spiracle, oriented as in Fig. 26. Sensory membrane (M) of scolopophorous organ 
and wall of mesothoracic epimeron (EM) have been damaged at right side of figure. 
Bulb-shaped scletrite (SC) of sense organ bears hexagonal pattern; possible homo- 
logue of flask-shaped body of Hesperocorixa lies immediately dorsal to it. Spiracle 
possesses prominent integumental region (IN); sieve-plate lies immediately dorsal 
to it. Mesothoracic postalar projection (PP) bears flattened scales. ES = meta- 
thoracic episternum. T op of figure is dorsal, right side is anterior. Scale line = 20 yum. 
Fig. 32. D. zealandiae; sclerite of right mesothoracic scolopophorous organ, 
oriented as in Fig. 25. A small portion of the sensory membrane is visible between 
the sclerite and the mesothoracic postalar projection (PP), which bears flattened 
scales. Note granular appearance of sclerite and pentagonal or hexagonal arrange- 
ment of grooves on its surface. Arrowheads indicate probable sites at which two 
cells of scolophore attach internally. Top of figure is dorsal, right side is anterior. 
Scale line = 20 yum. 
Fig. 33. H. interrupta; base of club-shaped sclerite of right mesothoracic sco- 
lopophorous organ, showing granular appearance and hexagonal pattern of grooves. 
Scolophore attaches on internal surface of knob (SA) on base; shaft of club-shaped 
sclerite extends posteriorly (left side of figure) from site of scolophore attachment. 
Specimen has been tilted ventromedially, concealing sensory membrane. FL = part 
of flask-shaped body. EM = mesothoracic epimeron. Sieve-plate of metathoracic 
spiracle appears at lower left. Top of figure is dorsal, right side is anterior. Scale 
line = 20 yum. 
