274 



ORDER DIPT ERA 



the mouth are separated by quite a period. Curtice claims 

 to have found larvae at all points between these two positions. 

 This cannot be purely accidental. More recently an Irish 

 investigator has reached the conclusion that the larvae bore 

 into the skin and migrate to the wall of the esophagus from 

 which point they travel to the position under the skin of the 

 back. The adults emerge in early sinnmer, in Texas as 



Fig. 220. — Hypoderma Hneata: a, second stage of larva from back; b 

 and c, enlargement of extremities: d. ventral view of third stage with 

 details of extremities at e and /; g, dorsal view of mature larva with enlarge- 

 ments of anal spiracles at h; i, the same, lateral view. Natural size indi- 

 cated by side lines. (From Insect Life.) 



early as May, in northern States May or Jime. The larvse 

 are pretty well grown by February, and by early ]\Iarch they 

 have practically reached maturity and the grubs issue 

 during March and early April, drop into the ground and 

 pupate and remain in this stage for five, six,, or seven weeks, 

 and the adults come on from ^lay to early June or the first 

 of July. 



The European species which has now been studied with 



