THE MELON FLY IN HAWAII. 



41 



second larval segments. When viewed from above the anterior spiracles are 

 situated upon the outer anterior angles, and the posterior spiracles upon the 

 central region of the posterior margin (fig. 10, a). When viewed from below 

 (fig. 10, b) the anal opening of the larva appears as a rounded black spot 

 on the twelfth segment, and the mouth opening as a depression in the central 

 portion of the first segment. The broken spinulose bands upon the ventral 

 surface of the larva appear upon segments 6 to 11 of the venter of the pupa- 

 rium as two narrow bands not encroaching upon the lateral sides. Between 

 the posterior spiracles and the anal opening is a distinct transverse blackish 

 line (fig. 10, c). 



DUEATION OF PUPAL STAGE. 



During the ' warmest summer weather at Honolulu, when the 

 daily mean temperatures average between 78.7° and 79.4° F. and 





Fig. 10. — The melon fly : Puparium. a, Dorsal view ; 1), ventral view ; c, view showing 

 the posterior spiracles, oval depression, and dark line marking on posterior portion. 

 Enlarged. (Original.) 



the relative mean humidity between 64 and 70.2 per cent, by far 

 the largest number of pupae require 9 days for development. Of 

 896 pupae, as shown by the data in Table VII, 67, 743, 85, and 

 1 yielded adults 8, 9, 10, and 11 days, respectively, after the forma- 

 tion of the puparium. During the cooler months of February, 

 when the average mean temperature was 71.6° F. and the average 

 mean relative humidity was 74.3 per cent, 83 and 420 pupae re- 

 quired 12 and 13 days, respectively, to produce adults. From 1,037 

 pupae not recorded in Table VII, 6, 125, 881, and 25 adults emerged 

 within 7, 8, 9, and 10 days, respectively, after the formation of 



