DoKKiNt;: Lepyronia qtjadrangularis. 537 



Structural characteristics. Practicallj^ the same as in the preceding instar 

 The wing: pads show no marked dovolopmont. The mesothorax and meta- 

 thorax together are equal in leiigtli to the prothorax. Clypeus is shghtly more 

 inflated than in the first instar. 



THIRD INSTAR. 



Size. Average length, 3.75 mm.; width across eyes, 1.05 mm.; width across 

 abdomen, 1.33 mm. 



Color. Bodj' is pale whitish-yellow, with considerable more yellow than in 

 the second instar. Head and thorax are unchanged in color. 



Structural characteristics. The' wing pads are plainly visible as caudal ex- 

 tensions of the lateral angle of the thoracic tergites, the first pair more promi- 

 nent than the second. The mesothorax is equal in length to the prothorax 

 and about twice the length of the metathorax. Two ocelli are present and are 

 black in color. Antennae with nine segments, but the terminal five segments 

 are nmch elongated. 



FOURTH INSTAR. 



Size. Average length, 4.48 mm.; width across eyes, 2.57 mm.; width across 

 abdomen, 2.17 mm. 



Color. Body pale greenish yellow. Head washed with reddish brown. 

 Thorax ^■aries from pale yellow to dark brown on mesothorax and metathorax. 



Structural characteristics. Antennae are practically the same in shape, but 

 more elongate. The fii"st pair of wing pads are produced caudad until their 

 apices almost reach the apex of the second pair. The exposed portion of the 

 second pair is but little longer than that of the first pair. 



FIFTH INSTAR. 



Size. Average length, 6.94 mm.; width across eyes, 2.57 mm.; width across 

 abdomen, 2.17 mm. 



Color. Body whitish green with ver>- little yellow. Head and thorax are 

 generalh' of the same color as the body. 



Structural characteristics. Lateral angles of the first pair of wing pads 

 are more produced and as long as the second pair. Second pair are also 

 greath' enlarged both in width and length, reaching the third segment of the 

 abdomen. Prothorax has the adult form with its emarginate posterior margin. 

 Median portion of mesothorax, is produced caudad until it almost touches the 

 posterior margin of the metathorax. Metathorax also slightly i)roduced caudad. 

 On the metathoracic leg indication of the third tarsal segment is shown; the 

 two rows of spines on the distal end of the tibia are also present, and the rows 

 of spines on the distal end of each segment of the tarsus are faintly visible. 

 The two front pairs of legs still have two segments in the tarsi and have two 

 rows of spines on the distal end of the tibiae which are not present in the adult. 



NOTES ON THE DIFFERENT STAGES. 



Structural differences between the first and second instars were 

 hard to discover. The chief difference is in the size, although a few 

 minor characters are sometimes evident. In the second instar the 

 apex of the labium just comes to the first coxa, but in the first 

 instar it extends to the second coxa, or at least between the coxae 



