THE TIMOTHY STEM-BORER. 



THE PUPA. 



(Fig. 4.) 



From the lateral aspect: Length 5 mm., diameter in thoracic region 1.125 mm. 

 Pale cream color, somewhat acuminate-ovate, broadly rounded at head and thorax. 

 Prothorax, from the lateral view, triangular, the dorsal surface being the base of the 

 triangle, which is very broad and convex. Antenna passing upward at side of eye, 

 between margin of prothorax and front femora, thence to dorsum, curving backward 

 over base of wings. Wing-pads long and narrow, covering posterior legs, with the 

 exception of the last three tarsal joints; front wings nearly covering hind ones. 



From the ventral aspect (fig. 4): The front of head is in almost direct line with the 

 body; mandibles small and not closed; palpi widely separated and extending beyond 

 front tibiae. Femora of first pair of legs directed dorsally, tibiae resting on middle femora; 

 first tarsal joints resting under tip of palpus; tarsal joints then extending caudad, 

 almost parallel, except last two joints, which slightly diverge. Femora of second pair 

 of legs parallel to femora of first pair, second 

 tibiae, however, forming a greater angle with their 

 femora than tibiae of first pair of legs; second 

 femora and tibiae resting upon wings for a part of 

 their length; tarsal joints gradually converging un- 

 til the last two, which nearly touch between 

 wing pads. Third pair of legs covered by wing 

 pads, with exception of last two joints and a part 

 of third; last two parallel, touching, and extending 

 to middle of sixth abdominal segment. 



Dorsal surface of the first six abdominal seg- 

 ments almost flat, and in the third, fourth, fifth, 

 and sixth segments the surface produced laterally 

 into a fleshy fold projecting over side of abdomen, 

 the anterior margin of which is rounded and the 

 posterior square, giving the abdomen a notched 

 appearance; in center of each projection laterally 

 is a group of recurved bristles. 



Seventh abdominal segment (fig. 4), from a 

 lateral view, cylindrical anteriorly; posteriorly 

 the dorsal surface is drawn out into a long cone- 

 shaped projection, the tip of which extends 

 beyond the last abdominal segment, resting 

 between its two chitinous spurs; ventral surface 

 extending backward into a fleshy fold or lip, beyond insertion of following segment. 



Eighth segment (fig. 4) somewhat cylindrical anteriorly, telescoping into seventh; 

 dorsal surface extending backward into a large fleshy projection or lip, almost filling 

 space between cone-shaped projection of preceding segment and Y-like chitinous 

 projection of following segment; a deep lateral notch or incision, but ventral projection 

 much shorter than dorsal. 



Ninth segment (fig. 4) smallest, telescoping into eighth, and extending posteriorly 

 into a Y-like projection, the tips of which, inclining forward, are amber-colored, 

 chitinous, and spinelike. 



Setae: Numerous setae on ventral surface of abdomen, on head, and on prothorax. 

 First abdominal segments bearing a few setae on dorsal surface; there is a small trans- 

 verse riclge on dorsum of second segment, bearing a row of setae; following four segments 



Fig. 4.— The timothy stem-borer: a. 

 Pupa, lateral view; b, ventral view 

 of same; c, ninth segment of same; 

 d, setigerous tubercle of sixth segment . 

 a, b, c, Greatly enlarged; d, more en- 

 larged. (Original.) 



