258 Journal Xew York Entomological Society. [VoLXIX. 



in which the ecdysis occurred. During this time, however, the head 

 is slowly drawn upward to its normal position and the insect finally 

 struggles to its feet. Its movements are at first very awkward and 

 uncertain but after a few minutes it is actively running about. As 

 before mentioned, the greater portion of the wings remains closely 

 folded together so that at first sight they appear as abnormally placed 

 wing-pads. A close examination with a hand lense shows them to 

 consist of the very compactly folded wing. Fig. 3 is a somewhat 

 diagrammatic illustration of one of the hind wings when in this condi- 

 tion. In it I have attempted to trace and name the various wing 

 veins, though owing to the much folded membrane their outline was 

 very indefinite and much less distinctly represented than in the illus- 

 tration. 



After these young adults have been running about for an hour 

 or so the main portion of the wing begins to expand ; the basal por- 

 tion becomes fully expanded before the apical part begins to unfold, 

 but the inflation gradually works toward the apex till the typical 

 fully winged though pigmentless adult is produced. The wings con- 

 tinue to be held away from the body till this process is complete, 

 after which they are folded from the base in an overlapping posi- 

 tion over the abdomen. The ensuing pigmentation of the body is 

 gradual and does not appear to be affected by the presence or absence 

 of light ; the entire body turns black through shades of yellow and 

 brown till in about twenty-four hours the sexually complete imago is 

 ready for swarming. 



It will be seen that the whole period intervening between the 

 normal nymphal stage and the typical pigmentless adult stage occu- 

 pies only some nine to ten hours and this apparently accounts for 

 its not having been recorded before, even though it appears to be 

 perfectly normal, for it has occurred in different localities in two 

 successive years and all the nymphs taken passed through these stages 

 before completing their development. 



An illustration of the thorax of Terincs flavipcs with unexpanded 

 wings was given by Packard in his Text-book of Entomology, but 

 he here described it as a late nymphal wing pad, otherwise there seem 

 to be no references to either of the stages herein figured and described. 



The nearest approach to the condition in Termcs flaz^ipcs is that 



