THE CHEERY LEAF-BEETLE. 



Fig. 3.— The cherry 

 leaf-beetle: Newly 

 hatched larva. 

 Much enlarged. 

 (Original.) 



the other thoracic segments, and all abdominal segments except the ninth and tenth. 

 The head is provided with a few scattered long bristles. The ninth abdominal seg- 

 ment is rounded behind and concave above, very heavily chitinized, and with a row 

 of long bristles around the edge. Below it is rather conical, with 

 the very small tenth segment forming the apex of the cone. The 

 latter bears the anus, which is modified to form an auxiliary organ 

 of locomotion. On each side, between the prothoracic and meso- 

 thoracic segments, can be seen a small tubercle surrounding the 

 meso thoracic spiracle, and each of the first eight abdominal seg- 

 ments is provided with a pair of spiracles. On each side of the 

 middle the pro thorax is irregularly impressed. This concavity 

 persists through all stages. 



At full growth (fig. 4) each instar is very much distended, the 

 yellowish skin becomes visible, and the dark color is confined to 

 plates and patches, the head, and the legs. The abdomen is parallel 

 sided and wider than the thorax. The head and ninth abdominal 

 segment, at least above, do not share in this distension, but retain 

 the size originally assumed after the molt. The dorsal surface of 

 the pro thorax is covered by a single large, dark-colored plate, flanked on either side 

 by the dark colored, chitinized tips of the lateral prominences. Just below the latter 

 are two small plates partially surrounding the base of the coxa. Ventrally the dark 

 color is confined to a nearly square median patch with a 

 very small oval patch behind it. In the meso thoracic and 

 metathoracic segments the dorsal plate is broken up into 

 two double transverse rows of tlu'ee plates each, the middle 

 one in each row being much the largest, and transversely 

 elongate. The lateral edges of the dorsum are very heavily 

 chitinized and dark colored. Below the latter are two 

 smaller plates, the anterior one of which on the mesothorax 

 bears the spiracle, the other being the tip of the lateral 

 prominence. Each of the coxae is partially surrounded 

 above by two small plates as in the prothorax. Ventrally 

 there are three plates, a large transverse anterior one and 

 a pair of small, nearly oval ones posteriorly. The dorsal 

 plate of each of the first eight abdominal segments is simi- 

 lar to that of the mesothorax and of the metathorax, being 

 broken up into two double rows of plates, but on the lateral 

 edge of the dorsum are two very small plates, the posterior 

 one of which bears the spiracle. Beyond these is the 

 chitinized apex of the lateral prominence. Below the color 

 is distributed in a transverse row of five spots. The ninth 

 segment has ventrally a crescent-shaped plate in front of 

 and partially surrounding the very small tenth segment, 

 which bears the anus. The tenth segment is heavily chiti- 

 nized laterally and posteriorly. (Fig. 5.) 



The newly hatched larva is shown in figiire 3 . The com- 

 parative size of the three larval stages is indicated by fig- 

 ure 6, which shows the heads and ninth abdominal seg- 

 ments drawn to the same scale. 



First instar. — The first larval instar (fig. 3) varies with 

 age from 2 to 3 mm. in length with the head 0.38 mm. and the ninth segment 0.36 mm. 

 broad. (Fig. 6, a.) 



Fig. 4.— The cherry leaf-beetle: 

 Full grown larva. Much en- 

 larged. (Original.) 



