36 INSECTS INJURIOUS TO GARDEN AND ORCHARD CROPS. 



cucurbit vines, as no other adult Sesiid has ever been found on cucur- 

 bits by those who have studied this class of insects. This opinion was 

 strengthened by rearing at about the same time the young larvae from 

 the eggs. To verify the writer's belief in the matter, a number of young 

 larva? that appeared to be ready to molt were separated, and July 25 

 two molted, and upon the next molt the ordinary form of satyr inifor mis 

 was obtained. The species was not carried through all its molts, as 

 this would require close application, and press of other matters already 

 under way did not permit the undertaking, but enough was learned to 

 show that the larva differs greatly from the time it hatches from the 

 egg until it is ready for pupation. 



Fig. 8.—Melittia satyriniformis : a, male moth; b, female, with wings folded in natural position when 

 at rest; c, eggs shown on bit of squash stem; d, full-grown larva, in situ in vine; e, pupa; /, pupal 

 cell — all one-third larger than natural size (original). 



Eeference to Dr. S. H. Scudder's " Notes on Melittia cucurbitce and 

 a related species," published in Psyche (vol. iv, pp. 303, 304), in 1885 — 

 but as that writer states recorded in notes more than twenty-five years 

 before that time — shows that he had these two forms of this vine borer 

 as subjects for his descriptions and notes. On this head the late Dr. 

 Kellicott wrote (Can. Ent., vol. xxiv, p. 209; Insect Life, vol. Y, p. 82): 

 "Among the smaller ones [larvae] there was an abundance of that sec- 

 ond form described by Dr. Scudder, in Psyche, vol. iv, p. 303. Some 

 of these were isolated, and after a few days, they molted, giving the 

 typical form. This seems to prove that there is but one species.*' 



The accompanying illustrations show the great differences between 

 the newly hatched larva, the half-grown larva, and the mature form. 



The larva when first hatched is of the appearance shown in figure 7 at 

 d. The head as with other newly hatched larvae is much larger in pro- 

 portion to the body than later on in its development; the body tapers 

 toward the anal extremity, the thoracic shield is considerably different, 

 and the entire surface is much more hairy than in later stages. The 

 length is 1.8 mra ; the width at the widest portion of the body, the first 

 thoracic segment, is 0.66 mm , while the head measures 0.58 mm across. 



