THE TIMOTHY STEM-BORER. 



3 



DESCRIPTION OF THE DIFFERENT STAGES. 



THE EGG. 



(Fig. 2.) 



Length 0.65 mm., diameter near center 0.16 mm. Color milky white. Acuminate- 

 ovate, apparently smooth; one side convex and the other slightly concave; large*end 

 broadly rounded, small end acutely rounded. 



Described from specimens dissected from 

 gravid females. 



THE LARVA. 



(Fig. 3, a.) 

 Length 6 mm., diameter 0.875 mm. 



Fig. 2.— The timothy stem- 

 borer: Egg. Highly magni- 

 Color varying fied. (Original.) 

 from creamy to white, shading into a very faint tinge of 



salmon near center. None of the segments appears to be corneous, although each 

 bears a number of setae; last segment feebly bifid, ending in a two-pointed spear, 

 and covered with stout bristles. Dorsal surface of abdomen with six pairs of fleshy 



tubercles which will be described 

 later. 



Head (fig. 3, b) narrower than 

 thorax and arranged almost ver- 

 tically with reference to it; ovoid, 

 smooth, and bearing a number 

 of large and small setse, a very 

 faint suture extending from the 

 occipital area almost to the episto- 

 mal area. 



Antennae represented by two 

 fleshy tubercles, situated laterad 

 of and near insertion of mandi- 

 bles; somewhat cone-shaped and 

 bearing several small setae on their 

 summits. 



Eyes represented by two tiny, 

 slightly fused black dots situated 

 slightly ventro-laterad of the an- 

 tennae. 



Epistoma sublimate; anterior 

 margin concave and posterior con- 

 vex; about twice as broad as long 

 and apparently inclosed by base of 

 mandibles and a chitinous ridge ex- 

 tending from insertion of mandibles 

 almost entirely across the face ; ridge 

 amber-colored. 

 Labrum tonguelike, lying directly over the mandibles, rectangular, longer than 

 broad; distal margin rounded and densely fringed with setae or bristles; upper 

 surface pappose; two' large setae near center and two on each lateral margin; six 

 smaller ones on distal margin. 



C5 



Fig. 3. — The timothy stem-borer: a, Larva, lateral view; 

 b, head of same, dorsal view; c, maxilla? and labium of 

 same; d, mandible of same, a, Greatly enlarged; b, d, 

 more enlarged; c, still more enlarged. (Original.) 



