EGG AND LARVA OF HESPERIA JUBA BDV. 
125 
only under relatively high magnification, are conspicuous struc- 
tures. Whether, as suggested by Fracker and as treated here, 
they represent primary setae or are an entirely different kind of 
organ, remains to be proved. In any case they are probably of 
taxonomic value. The first instar map has aided in the inter- 
pretation of the fifth instar setae, but is probably incomplete in 
the ventral region, due to the low power of the lens used in 
making it. 
In the first instar the head was light brown with sparse rounded 
punctures on the epicranium. The capsules of the remaining 
stages, in contrast, were so densely blackish brown that they 
could not be examined by transmitted light, and the punctures 
covered the entire epicranium and frons, separated by about their 
own diameter, and merging into roughened sulci toward the 
clypeus. The change in form of the head is well represented 
by figures one and two, showing the first and fourth instars. In 
the fourth instar a few transparent spots appeared in the epi- 
cranium and frons, two, rather long, flanking the frontal suture, 
two pairs in the frons, and two larger patches in front of the ocelli. 
The setae of the head in the first instar (fig. 1) included a pair 
of ultra posteriors and two pairs of adfrontals, all rather promi- 
nent, which could not be observed in the later stages. In these, 
however, they may possibly have been obscured by the numerous 
short curved secondary setae .which were to be found between 
the punctures. One ocellar seta likewise was found only in the 
first instar, but none of the setae of the middle group of the 
labrum could be discovered in this stage, and only one of the 
mandibular group. 
