142 THE CANAEIAN ENTOMOLOGIST 



projecting at right angles to the axis of each mandible near its apex, while just 

 within this group of fangs is the much smaller movable endopodite, terminating 

 in a tiny brush of differentiated long and short hairs. The molar surface of the 

 right mandible (PI. X, Fig. 4) is situated on the lateral margin, while that of the 

 left mandible (PI. X, Fig. 3) is on the outer anterior margin. Each maxilla 

 (PI. X, Fig. 6) is made up of a basal portion, thecardo, which is roughly broad- 

 triangular in shape and apparently divided into two sclerites. A united galea, 

 lacinia and stipes, oblong in shape, more or less constricted in the middle, with 

 apex diagonally truncate and the base rounded ofi on the inner side, is ap- 

 parently attached to both sclerites of the cardo. A short suture at the inner 

 apical corner of this combined sclerite marks the only differentiation between 

 the galea and lacinia, while these structures cannot be separated from the 

 stipes. A thick brush of long, fine hairs borders the truncate distal margin of 

 the galea. The four-segmented palpi are attached about midway on the outer 

 margin of this combined sclerite, with the basal segment minute tringular and 

 the remaining segm.ents elongate cylindrical. The second and fourth palpal 

 segments are subequal in length, the third is a little shorter. The apical seg- 

 ment terminates in a cluster of hairs nearly as long as the segment. The labium 

 (PI. X, Fig. 5) consists of a ligula divided into oval glossse and much wuder para- 

 glossae, a pair of large, three-segm.ented labial palps, and a very much reduced 

 and undifferentiated mentum, submentum and palpifer. The glossae are clothed, 

 except at the base with short, fine hairs, have a row of short, stout spines on the 

 lateral margin, and terminate at the apex in a hook-like spine. The hairs 

 on the distal portion of the paraglossse are much longer than those on the glcssae. 

 The apical segment of each labial palpus possesses a row of rather stout hairs 

 on its inner margin, while there are finer hairs on the outer margins of the basal 

 segm.ents. The hypopharynx (PI. X, Fig. 2) which normally lies closely applied 

 to the labium, is divided into a central piece and two large lateral lobes which 

 have long, fine hairs on their distal portions, while there are two short tufts 

 close to the median m.argin of the central piece. 



Adult. 

 (PI. X, Fig. 10). 



Dr. Needham (3) has described the adult as follows: — . 

 "'?Choroterpes betteni 



"Length 5-6 mm.; expanse 10-11 mm.; setae of the male 5-6 mm., and of 

 the female 4y2~5 mm.; colour nearly uniform, dark reddish brown, slightly 

 paler on the middle abdominal segmicnts in the female; wings hyaline, veins 

 pale brown; legs yellowish brown, hind femur with two darker bands, fore femur 

 of the female wholly dark; setae pale yellowish with brown rings, three in num- 

 ber, equal; forceps of the male pale brownish, darker beneath with one very long 

 basal and two very short apical joints." ^ 



Alale Genitalia. 

 The male genitalia follow the general plan of structure which is constant 

 in all of the species of Leptophlebia which were examined. They (PI. X, Fig. 

 13) consist of paired penes placed between the forceps, each limb of which is 

 made up of ore long stout, slightly tapering basal segm.ent and two small oval 

 terrrinal segn ents, equal in size. The penes form an unjointed lobe-like pro- 



