3<D2 FRANCIS A. HULST. 



DESCRIPTION OF PLATES. 



EXPLANATION OF PLATE X. 



FlG. I. Culex pitngens, larva two thirds grown, showing the beginning of degen- 

 eration. Several nuclei () are seen in the granular material (g) separated from the 

 muscle fibers ({/"). n f shows a hypertrophy and nearly spherical form. The 

 smaller nuclear bodies are shown in preceding and following sections to be similar 

 nuclei to those shown in this section. 



FIG. 2. The muscle reduced to fribrillse with marked breaking and condensation 

 of parts. Many hypertrophied nuclei are also seen. 



FlG. 3. Here is represented a marked degree of disintegration of the muscle sub- 

 stance and vaculation without the presence of granular material. 



FIG. 4. This shows the same as Fig. I with many small cells in the connective 

 tissue envelope of the bundle. 



