BULLETIN 352^ U. S. DEPARTMENT OF AGEICULTUEE. 



Second instar. — Immediately after the first molt the second instar is about 3 mm 

 long, and at full growth 4.5 mm. long. The head is 0.57 mm. and the ninth abdominal 

 segment 0.5 mm. broad. (Fig 6, h.) 



Third instar. — The newly molted larva of the third instar is 4.5 mm. long with the 

 head 0.78 mm. and the ninth segment 0.7 mm. broad. At full growth (fig. 4) it is 

 7 mm. long and the measurements of head and caudal seg- 

 ment are unchanged. (Fig. 6, c.) 



THE PUPA. 



The pupa (fig. 7) is slightly less than 5 mm. long, bright 

 yellow, and with a pair of strong curved spines at the apex 

 of the abdomen. The pro thorax has the concavity charac- 

 teristic of all stages of the species. The head has a curved 

 row of four bristles above, the concave side of the curve to 

 the front. On the pronotum are two rows of four bristles 

 each, the anterior one curved to the front and the posterior one 

 to the rear, and in addition a long bristle on each lateral 

 angle and two near the posterior edge. The scutellum and 

 metanotum each have a nearly straight row of four bristles. 

 Each of the abdominal segments, except the last, has a pair of 

 small bristles near the middle, and a single long bristle at each lateral angle. Each 

 femur has a pair of apical bristles. The spiracles of the first five abdominal seg- 

 ments and of the mesothorax are conspicuous from their black color; the outer ends 



Fig. 5.— The cherry leaf- 

 beetle: Eighth and ninth 

 abdominal segments, lat- 

 eral view, showing ex- 

 truded end of alimentary 

 canal used as auxiliary 

 organ of locomotion. 

 Much enlarged. (Origi- 

 nal.) 



Fig. 6. — The cherry leaf-beetle: Larval heads and caudal segments, showing proportional size in the 

 three instars: a, First instar; 6, second instar; c, third instar. Greatly enlarged. (Original.) 



of the tracheae show black through the body wall for a short distance, 

 of the sixth and seventh segments are paler. 



The spiracles 



THE ADULT. 



The adult beetle is rather oval in shape, about one-sixth of an inch 

 long by about one-half as broad, and somewhat flattened. It is dull 

 red with black legs and antennae. 



As Le Conte's original description of the species is in Latin, the 

 description given by Horn (1893) is quoted below: 



G. cavicollis Lee, Proc. Acad. 1865, p. 216. Oval, narrower in front, subdepressed ; 

 color dull red, slightly shining, very sparsely finely pubescent. Antennae entirely 



