April 1. 1920 Banana Root Borer 



43 



dorsum of the ninth segment extends xmderneath, so that it is apical to the entire tenth 

 segment. The tenth segment is completely ventral and very small. The tip of the 

 abdomen showing the position of the tenth segment is illustrated in Plate 9, G. 



PUPA (PL. 10) 



Elongate, about 12 mm. long, white. This pupa is characteristically calandrid in 

 the possession of very large thoracic spiracles located on a prominent lobe at the base 

 of the prothorax (PI. 10, B). The beak is very irregularly margined with numerous 

 transverse depressions (PI. 10, A). There are four pairs of large setae and two pairs of 

 tiny setae on the head and beak. The foiu: larger pairs of setae are borne on tubercles, 

 one on the head and three on the beak. The two pairs of tiny setae are located medianly 

 to the two basal pairson the beak, as shown in the drawing. The prothorax (PI. 10, C) 

 is rather elongate subquadrate, rounded in front, with basal angles rounded, and bears 

 six pairs of setigerous tubercles, of which the apical pair are the largest. There are two 

 antero-lateral, two postero-lateral, and one antero-median pairs of setae. The meso- 

 thorax has one pair of scutellar setae. The first six abdominal segments are normal, 

 and each bears three pairs of scutellar setEe. The first six abdominal spiracles are 

 larger and more prominent than the larval spiracles. The seventh and eighth spiracles 

 are minute. The first two ventral segments are very much crowded. The seventh, 

 eighth, ninth, and tenth segments are greatly modified both above and below. Dor- 

 sally the seventh segment is elongate, apically it is tuberculate, and it has two pairs 

 of setigerous tubercles, one pair being on the larger apical tubercles. From a lateral 

 view, it is seen that the seventh segment is dorsally the terminal segment , but ventrally 

 it is surpassed by the other segments. In other words, it is laterally emarginate for the 

 reception of the other segments, each of which includes the succeeding segment. The 

 ninth segment is provided with a pair of very long, chitinous processes, corresponding 

 to the cerci, at the side of which are two setigerous tubercles. 



Ventrally (PI. 10, A) the mesothorax is smallest, prothorax next, and metathorax 

 next. The mesostemum is protuberant, the metastemum elongate and flattened. 

 The coxae are spherical ; the femora are setigerous at the apex. The wing pads extend 

 only to about the apex of the fouxlh abdominal segment. 



ADULT (PL. 8) 



Length 11 mm.; breadth at base of elytra 4 mm. Head small, spherical; beak 

 separated from head by constriction, swollen in basal third, finely punctate in basal 

 half; moderately curved, slender and cylindrical and smooth in apical half. Scrobes 

 located in basal third beneath the swelling, oval, more approximate behind than in 

 front. Gular suture extending almost entire length of venter of beak and head. 

 Antennae geniculate, scape almost as long as funicle. Funicle 6-jointed, first joint 

 moniliform, succeeding joints more closely appressed, last joint very closely appressed 

 to club. Club 2-jointed, basal joint occupying two- thirds of the length, shining, 

 with a few minute hairs; apical joint spongy, short, aad rounded at apex. Other 

 funicular joints bearing a few tiny hairs. Eyes finely granulate, elongate oval, 

 transversely contiguous beneath, anteriorly margined. Prothorax very long; moder- 

 ately evenly punctate, with an irregular smooth median line indicated on disk; 

 constricted near apex, apex tubular; narrowest at apex, roundingly broadening to 

 about the middle; sides almost parallel from middle. Scutellum small, subquadrate, 

 moderately short, with slight humeral angles. Stride moderately impressed, pimctate. 

 Intervals of irregular width, the first, third, and fifth being slightly wider than the 

 alternate intervals, minutely punctate. Pygidium almost vertical, spongy, pubescent, 

 with setigerous punctures. Undersides more sparsely pimctate. Sternum flattened. 

 Procoxae and mcsocoxae cylindrical, metacoxaeoval, trochanters small, femora laterally 

 164175°— 20 4 



