51] LEPIDOPTEROUS LARVAE — FR ACKER 51 



I. Spiracles elliptical, normal in size, those of 



segment 8 farther dorsad than others. 



AEGBRIIDAE 



II. Spiracles circular, very small, the pair of 



segment 8 about in line ; crochets of right 

 and left sides usually almost continuous 

 across ventromeson. COLEOPHORIDAE 

 gg. Crochets arranged in a circle or penellipse. 

 h. Kappa and eta of abdomen remote or eta wanting 

 (Fig. 8). 

 i. Crochets arranged in a multiserial circle (Fig. 96) 

 or in a penellipse (Fig. 98). 

 j. Setae beta of prothorax closer together on domim 

 than setae alpha; crochets always in a multi- 

 serial circle. ACROLOPHIDAE 

 jj. Setae beta on prothorax farther apart than setae 

 alpha, 

 k. Theta absent on abdomen (Fig. 37) ; beta, 

 delta, and rho distant on the prothorax (Fig. 

 35) ; crochets sometimes in a penellipse. 



YPONOMEUTIDAE 



kk. Theta present on abdomen (Fig. 6) ; beta, 



delta, and rho adjacent on prothorax (Fig. 5). 



HEPIALIDAE 

 ii. Crochets arranged in a uniserial circle. 



j. Prothorax with setae of Kappa group distant, 

 about as far from spiracle as from each other; 

 setae alpha of abdomen closer together than 

 setae beta. LYONETIIDAE 



jj. Prothorax with setae of Kappa group all close 

 together, twice as far from spiracle as from 

 each other, 

 k. Setae alpha of abdomen much farther apart on 

 dorsum than setae beta. TINEIDAE 



kk. Setae alpha of abdomen not farther apart on 

 dorsum than setae beta. HELIODINIDAE 

 hh. Kappa and eta of abdomen adjacent (Fig. 41) ; cro- 

 chets in a uniserial circle or penellipse. 

 i. Pi group of mesothorax bisetose (Fig. 36). 



j. Long axis of prothoracic spiracle vertical; setae 

 alpha of segment 9 closer together than setae 

 beta. THYRIDIDAE 



