February', '15] 



RUGGLES: OBEREA TRIPUNCTATA 



83 



dark brown; the labium is light-colored and seemingly not chitinized. 

 The posterior area of the dorsal portion of the head is light-yellow, 

 resembling the thorax in color. A larva just after hatching is only a 

 little over twice as long as the width of the widest part. The segments 

 are closely set together. Later, as the larva grows, these separate, as 

 in the other instars. The shape is typically Cerambycoid; the thoracic 

 segment immediately caudad of the head having the largest diameter 

 of all the segments, while the following segments gradually decrease 

 in size until the penultimate segment is distinctly smaller and the anal 

 segment distinctly smaller than the preceding. On a distinct anal 

 ridge on the caudal portion of the first thoracic segment is a somewhat 

 triangular area in which are short hairs or bristles giving the appear- 

 ance of shagreening. This area is very noticeable in all the succeeding 

 instars. Ten transverse rows of short bristles are seen in each sha- 

 greened area. The third, fourth and fifth rows are composed of larger 

 bristles while the last few rows are very small and almost inconspicuous. 



A number of short, stiff hairs arise from the head and on the lateral 

 margin of each thoracic and abdominal segment are found three to six 

 hairs somewhat longer than those found on the head. The posterior 

 margin of the caudal segment is beset with numerous hairs. Toward 

 the end of the instar, the segments are plainly distinguished and 

 dorsal ridges as described in instar number two begin to appear. 



Second Instar. — Head measurement, .45 mm., length, 3 mm. to 5 

 mm. The last three or four rows of inconspicuous bristles in the 

 shagreened area of the thorax are curved. On the dorsal surface of 

 each of the abdominal segments, particularly the second to the sixth, 

 there is a distinct, flattened, ridge-like area. These look like tubercles 

 in a side-view. (Fig. 4.) The hairs are the same as for the first 

 instar. 



Third Instar. — Head measurement, .66, length, 4.5 mm. to 10 mm. 

 Besides the characteristics mentioned for the other instars, the seg- 

 ments of the larvae have a decided moniliform appearance, due to the 

 prominence of the dorsal ridges and the swollen lateral margins of the 

 segments. The ventral surface of each segment has also a prominent 

 ridge. 



Fourth instar. — Head measurement, .8 mm., length, 10 mm. to 22 

 mm. The dorsal ridges are very regular and on the flattened surface, 

 indistinct shagreening, divided into two distinct lines, each separated 

 by a median line, may be detected. The ventral protuberances have 

 minute tubercles and hairs on the surface. 



Fifth Instar. — Head measurement, 1.2 mm.; length, 19 mm. to 

 25 mm. The other characters are very similar to those in fourth 

 instar. 



