188 



the last and both densely and cnarsel J" punctured; segments 2-4 rather finely punctured 

 at middle, more coarsely at the side, segment 2 a little shorter than the first, 3 and 4 

 equal, each shorter than the second. Femora, orange-yellow trochanters and tip of 

 femora black; tibije dirty brownish yellow, simple (not bi-spiuose) at tip, tarsi piceous. 



The structure of the head, mouth-parts and the trausverse folds of the 

 segmeuts of the larva (Fig. 43, c) agrees with that of Sphenopltorus ro- 

 hustm, described aud figured by us iu our Annual Report for 1881 -'82, 

 (p. 141-142, pi. VIII, Fig. 2, a) but is distinguished at once by the 

 rather sudden enlargement of abdominal segments 4, 5, and 6, the 

 fifth being especially large and bulging. In this respect it resembles 

 tlie larva of Sphenophorus liratns as described aud figured by Ch. Co- 

 querel (Ann. Soc. Ent. France, 1849, p. 455-45G, Plate VIII, Fig. Ill, 

 2), but in the latter species the enlargement of the abdominal segments 

 is said to be gradual. The thoracic and anterior abdominal spiracles 

 are as iu 8. robnstus; the sixth and seventh pairs are, however, more 

 dorsally placed and the eighth pair is entirely dorsal, somewhat ob- 

 liquely placed aud as large us the prothoracic spiracles. The last seg- 

 ment is broadly truncate at middle of apex, the truncature being 

 accompanied each side by a shorter oblique truncature. The four angles 

 thus formed are marked each by two long seta;, one placed above the 

 other. 



The pupa (Fig. 43, d), while resembling in general shape that of 8. ro- 

 bustus, is distinguished by the stronger armature of the head. The two 

 setigerous frontal tubercles are very ]>rominent and surrounded anter- 

 iorly by a crescent-shaped ridge in front of which is a small setigerous 

 tubercle. The tubercles near the base of the beak are also more prom- 

 inent. Near the hind angles of the thorax are each side two rather 

 large, blunt tubercles, and another obliquely placed pair of smaller 

 tubercles on each side of the disc toward the anterior angles ; two small 

 tubercles are also at the middle of the anterior margiu. The armature 

 of the pygidium (seventh dorsal abdominal segment) consists of a single 

 row of rather large setigerous tubercles, and the last ventral segment 

 is truncated at tip, terminating each side into a bi setose cone like i)ro- 

 cess. The prothoracic spiracles are very large and conspicuous. 



Judging from the specimens of sugarcane received from Mr. Wickson 

 the damage caused by the beetle must be very great since the stalks 

 were completely riddled with the galleries of the larvae, several of the 

 latter being in a piece of cane about 8 inches long. The galleries 

 (Fig. 4.5) are wide when compared with the diameter of the larva, and 

 not long, mostly running longitudinally, but some also across the cane. 

 They are filled with macerated fiber whicii the larva apparently pushes 

 behind itself. When ready to pupate the larva somewhat enlarges the 

 channel and forms a coarse cocoon of fiber in which the transformation 

 takes place. The outside of the infested cane (Fig. 44) shows several 

 small round holes which probably represent the place where the egg 

 has been inserted by the parent beetle, and several large, oblong open- 

 ings which are probably the exit holes of the emerging beetle. 



