104 



white with reddish brown head (Hght brown ochre), front of 

 the head and mandibles apically black and typically rhyncophorid 

 in form. The essential characters are illustrated in PI. I., figs. 

 2 and 2a. 



The head is strongly chitinized, globose, -somewhat depressed. From the 

 base a median pale line passes forward, the epicranial suture. It divides 

 anteriorly and forms the frontal sutures, which enclose laterally the sub- 

 triangular area known as the frons, margined in front by the epistoma. 

 The large areas on either side of the epicranial suture are the epicranial 

 areas, further bounded by the frontal sutures, the pleurostoma and the 

 hypostoma. In front of the frons is the more or less rectangular clypeus, 

 which is more than twice as wide as long, and in front of this is the 

 labrum, also transverse with rounded anterior margin. The clypeus and 

 labrum partly overlap the mandibles, which arise at the side of the 

 clypeus, based below on the pleurostoma and above on the frons. Directly 

 behind the mandibles and in the anterior lateral angle of the frons arc 

 the antennae, and behind the antennae but in the epicranial area are 

 small pigmented ocelli. The maxillae lie free from the head skeleton 

 below the hypostoma and behind the mandibles. They consist of the 

 stipe and lacinia, the cardo or basal piece, and the two-segmented palpi 

 at the apex. The labium_, which lies in the* median line below the ob- 

 structed mouth opening, consists of scutiform "stipes labii" surmounted 

 by two-segmented palpi. Below and around it are the large, fleshy lobes 

 constituting the mentum and submentum. There is a small, abortive 

 branch of the frontal suture extending back on the epicranium on each 

 side of and not far from the epicranial suture. The setae on the epi- 

 cranium are arranged as folloW'S: On each lobe one near the terminus 

 of branch of frontal suture, one on the disc opposite the preceding, one 

 opposite middle of frons, one on lateral margin behind this and one at 

 base of mandibles. On the frons there are three pairs, the posterior on 

 the lateral suture, the middle behind the anterior margin and on either 

 side of and close to median line, the anterior in anterior lateral angle 

 near antennae. On the labrum there are three setae on either side of 

 the median line and many short hairs on anterior margin. There is one 

 on the outer face of mandibles. On the maxillae there are two setae near 

 the apex and one near the base of the stipe, and the lacinia has a fringe 

 of short stout hairs outwardly. The "stipes labii" has one pair of setae 

 near the base and some small hairs near the apex, ^ach lobe of the 

 mentum has one pair of setae. The pronotum is simple, undivided, feebly 

 chitinized, with three setae on the disc on either side. The mesonotum 

 and metanotum are composed of prescutum and scutoscutellum. The first 

 six abdominal sclerites are composed of a fusiform prescutum, a trans- 

 verse scutum terminated by a spiracle, a fusiform scutellum and a trans- 

 verse postscutellum, very greatly narrowed on the dorsum. The scutellum 

 of each segment has a prominent hair on either side of the median line 

 (more laterad on the scutoscutellum of the meso- and metathorax) and 

 these together form longitudinal series. There are two setae on the 

 pleurae and abdominal segments, also forming longitudinal series, and 

 many short, fine hairs scattered over the surface. There are eight abdo- 

 minal spiracles and one on the prothorax; this and the one on the eighth 

 abdominal segment are very large. The ninth abdominal segment is very 

 much reduced in size, the eighth somewhat also, and the hairs on these 

 segments, as w'ell as those on the scutellum of the seventh segment are 

 larger than elsewhere on the body. 



The larval development occupies from one to four months. 

 The largest number of those reared pupated on the 51st day 

 after hatching from the egg (see Tattle II.). 



The pupa: AMien full grown the larva enlarges the tunnel in 



