412 N. E. McINDOO 



d. Pores on all six instars. A careful study of the pores on all 

 six instars shows very little difference in regard to their distribu- 

 tion, but the total number of them on the different instars varies 

 from 727 in the first instar to 1571 in the sixth instar (adult fe- 

 male). The first four instars are wingless while the wings of the 

 fifth instar are comparatively small, as already shown in figures 

 16 to 19; nevertheless, the groups of pores on the adult wings are 

 the same in number and position as are those of the fifth instar, 

 but the adult wings bear only a few isolated pores. A few pores 

 were found on the cerci of the first four instars, and many widely 

 scattered ones lie on the ovipositors of the adult female and of 

 the fifth instar (table 1). Now, since it is not expedient to tabu- 

 late the numbers of pores found on the various parts of the in- 

 tegument, they will be presented for the six instars in the follow- 

 ing order: first, second, third, fourth, fifth, and six instar ( 9 

 and cf). Mandibles: 71-74-86-92-92- 9 86- & 108; maxillary 

 palpi: 11-10-7-21-28- 9 56-cr24; galeae: 51-48-43-48-72- 9 56 

 -c?62; laciniae: 52-48-48-56-104-9 128-^108; hypopharynx: 

 42-50-50-82-101- 9 1 10- tf> 108; labial palpi: 12-10-12-16-20- 



944-c?20; ligula: 17-24-22-18-36- 9 26-^38; labrum: 4-4-5- 

 5-4- 9 4-^4; mentum : 12-8-6-6-10- 9 10- <? 10 ; total number of 

 pores on mouth-parts: 272-276-279-344-467- 9 520- c? 482; head 

 capsule: 9-11-9-14-7- 9 5- d* 7; antennae: 22-28-42-56-98- 



9 106- & 1 10 ; abdominal segments : 54-45-54-50-45- 9 45- c?36 ; 

 cerci: 3-4-3-5-0- 9 0- cfO; ovipositor: fifth instar 9 53-adult- 

 c?55; legs: 367-429-449-485-660- 9 718- tf 720; front wings: 

 fifth instar 84- 9 84r- d*86 ; hind wings : fifth instar 66- 9 38- d*40; 

 total number of pores found on entire integument : 727-793-836- 

 954-1480- 9 1571- c? 1481. In obtaining these figures, the mi- 

 nutest and the most difficult pores to be found on the fifth instar 

 have not been counted, nor have those found on the thoracic 

 segments of the fifth instar been counted. 



Disposition of pores in other Orthoptera 



In making a comparative study of the disposition of the ol- 

 factory pores in Orthoptera, both sexes of twenty-one species, 



