147] LEPIDOPTEROUS LARVAE — FRACKER 147 



EXPLANATION OF PLATES 



Plates I to VII and X consist entirely of setal maps. In these the 

 top line of the diagram represents the dorsomeson and the bottom line 

 the ventromeson. Thus the map shows the entire left half of the seg- 

 ment, the thoracic leg or the proleg, as the case may be, being indicated 

 by an ellipse. 



The body segments are numbered I, II, III, 1, 2, 3, 4, 5, 6, 7, 8, 9, 

 and 10, the Roman numerals referring to the thorax and the Arabic to 

 the abdomen. Care should be taken in using this in connection with the 

 statements of other authors. For example, the head is counted as "joint 

 1", the prothorax as "joint 2", etc., in Dyar's descriptions. Dyar has 

 also entirely failed to note segment 9 and thus, while segment 8 is his 

 "joint 12", the anal segments is called "joint 13". In the setal maps the 

 number of each segment is given in the lower left hand corner. 



In all the figures, both of setal maps and other structures, the head 

 is at the left. 



The following is a list of all the setae. Each is indicated by a 

 lower case Greek letter : 



a alpha 6 theta p rho 



(S beta k kappa <j sigma 



y gamma A lambda (rare) r tau 



8 delta /u, mu <t> phi 



« epsilon v nu o> omega 

 i] eta it pi 



Certain definite groups of setae are indicated by capital Greek 

 letters. They are: Beta, B (a+/3) ; Kappa, K (&-\-k+ v ) Rho, P 

 (e-j-p) ; Pi, II (i'-f it on thorax, v-\-tt-\-t on abdomen) ; Tau, T, some or 

 all of the three setae, tau, phi, and omega, the first of which is, how- 

 ever, more closely associated with the Pi group on abdominal segments. 

 Of the Kappa group, theta is usually absent. 



The ocelli are numbered as in Fig. 70. 



The numerals applied to the head setae are taken direct from 

 Forbes (1910), who uses Dyar's system for them. In his paper will be 

 found large numbers of drawings of head parts, and for that reason 

 only a few have been figured here. 



