5 1 8 
Psyche 
[September -December 
somewhat irregular rows, each row overlapping the one posterior to 
it (Figs. 6, 7). The tapered tip of each seta points posteriorly and 
somewhat laterally on the body except in the spiracular regions, where 
those immediately lateral to the spiracles point posteromedially. On 
the eighth paratergite the setae are fewer and farther apart and do 
not overlap. 
Under the stereoscopic microscope the ventral paratergites, unlike 
the “nonfoliated” regions of the body, have a faintly golden sheen. 
The sheen is visible when specimens are immersed in alcohol, which 
would remove any adherent air layer. It is probably the result of 
light diffraction by the fine longitudinal ridges on the ventral surfaces 
of the flattened setae (Figs. 7, 8). 
In their shape and overlapping arrangement the setae resemble the 
plastral devices of Phytobius (Coleoptera; Thorpe and Crisp 1949). 
Unlike the latter, however, they do not bear plastral hairs on their 
external surfaces. The plastral hairs arise from the exoskeletal sur- 
face beneath the leaf-like setae and are largely concealed by them 
(Fig. 7) but were clearly visible in regions where the setae had been 
scraped off with watchmaker’s forceps (Fig. 4). Although the setae 
do not completely cover the ventral abdominal spiracles they overlap 
so much of their margins that we could not observe spiracular struc- 
ture or determine whether or not they possess radiating “rosettes” 
similar to those of the second through seventh abdominal spiracles of 
Aphelocheirus (Thorpe and Crisp 1947a). 
The second through seventh abdominal sense organs (Fig. 1, SO 2- 
SO 7) are composed of leaf-like setae which are two to three times 
longer than those covering the rest of each paratergite (Fig. 9). 
Most of these elongated setae project more laterally than the shorter 
ones, and have blunter tips and more pronounced longitudinal ridges 
Fig. 8. Cryphocricos hungerfordi ; detail of one leaf-like seta on fifth 
ventral abdominal paratergite. Note longitudinal ridges and tapering tip, 
which points posterolaterally (lower left). Surrounding setae were rubbed 
off, revealing tips of underlying plastral hairs and apparently socketed 
base of seta. Scale line = 2 ^m. 
Fig. 9. C. barozzii ; sense organ on third ventral abdominal paratergite 
Sense organ is composed of elongated leaf-like setae. Tips of shorter 
leaf-like setae, covering rest of paratergite, are visible at bottom and 
upper left of figure. Right = lateral, bottom = posterior. Scale line = 
30 /im. 
Fig. 10. C. barozzii; detail of Fig. 9, showing longitudinal ridges on 
elongated leaf-like setae. Scale line = 2 j^m. 
