158 Maine Agricultural Experiment Station. 1918. 



viii x 



ix xi 



x xij 



xiii, xiv xiii, xiv 



Abdomen. 



i, ii, iii, iv, v, vi, vii, viii i, ii, iii, iv, v, vi, vii, viii 



ix-x ix-x 



xiii xiii 



xiv xii-xiv 



Description of full grown larva. Head, thorax, and abdo- 

 men distinct; abdomen composed of 10 segments; pronotum and 

 dorsum of 9th abdominal segment strongly chitinized to form 

 the prothoracic and anal shields respectively ; one pair of jointed 

 legs borne by each of the thoracic segments ; a single median 

 anal proleg borne by the 10th abdominal segment. Length 5-5.5 

 mm. 



Head directed obliquely downward and forward, strongly chitinized, 

 shining black; the epicranial suture, at first extending cephalad along 

 the mesal line, soon splits, passing back of the antenna to the base of 

 the mandible on each side : it divides the head into three large segments, 

 the median dorsal one the postclypeus, and the other two forming the 

 epicranium; the clypcus is very narrow; the labrum is moderately large, 

 rounded in front, shining black ; mandibles dark brown, moderate in 

 size, with notched teeth at the apex ; trochantin present at its base, non- 

 chitinized ; maxilla with the cardo completely, the stripes incompletely, 

 chitinized, bearing anteriorly a palpifer with a three-segmented conical 

 palpus, and a very small nodule which probably represents the lacinia; 

 labium with a large, slightly chitinized basal piece, the fused submen- 

 tum and mentum, bearing a ligula, unchitinized except at its base, from 

 which arises a pair of small two-segmented palpi ; antennae inserted on 

 the side of the head near the base of the mandibles, three jointed, white, 

 the basal segment much larger than the middle segment, and the distal 

 segment very small; ocelli wanting; a membrane connects the head and 

 prosternum which are not separated by a suture ; a small chitinized 

 sclerite in this membrane is probably the gula. 



Body-wall of thoracic and abdominal segments dirty white, densely 

 beset with dull black cuticular nodules ; tubercles i-viii prominent, dull 

 black; tubercles ix-xiv, dull brown. 



Abdominal segments 1 to 8 bear setiferous tubercles, segments 1 

 through 7 being identical; on the first seven the arrangement is as fol- 

 lows : tubercles i and ii of each side are confluent forming a mid-dorsal 

 row of two tubercles on each segment (the anterior the larger) bearing 

 two setae each ; tubercles iii, iv, v and vi are distinct, bearing one seta 

 each, and the spiracle is borne on a tubercle which lacks setae between 



