112 



The larva (fig. 3, c, d) resembles, in general contour, both as seen 

 from above and from the side, that of the elm leaf -beetle, but here the 

 superficial resemblance ends, as this species is nearly uniform dark 

 olive brown in color and the piliferous tubercles are rather pale yel- 

 low, but strongly marked. They are arranged as shown in the illus- 

 tration, those of the anterior half of each segment coalescing near the 

 center. The head is moderately shining black and portions of the legs 

 are of the same color. The hairs are of two kinds, pointed and trun- 

 cate, and some are pale and some dark in color, all being rather short. 

 The head is about half as wide as the first thoracic segment and the 

 body gradually tapers till the third or fourth abdominal segment when 

 it is widened, tapering again toward the anal extremity, the last 

 segment being quite narrow. The segmentation is strongly marked, 

 the tubercles on the sides prominent. 



Fig. 3. — Monoxia puncticoUis : a, female beetle; b, eggs; c, larva, dorsal view; d, larva, lateral view; 

 <S , claw of male: J . claw of female — all much enlarged, male and female claws more enlarged 

 (original |. 



The length in somewhat contracted natural position is about 8.5-9.03 

 mm. and the greatest width 2.8-3.0 mm. 



The young larva when hatched measures about 1.5 mm, and differs 

 from the mature form in having a more prominent head, dark brown 

 thoracic shield, and in being of a dull gray color, the tuberculous 

 areas showing as darker brown. The legs are more prominent, and 

 the hairs are relatively longer. 



Thus far injuries by this species have been reported only from Colo- 

 rado and New Mexico, and only to sugar beet. The species as defined 

 by Horn includes four or more varieties. The typical form is the one 

 under consideration. It is one of the larger ones, measuring five or 

 six sixteenths of an inch in length; is dull grayish brown in color, 

 with dull blackish stripes on the elytra, present in all individuals 



