THE CAMPHOR THRIPS. 



-*s dKS ' ' 13h 



^gg .££0^ 



Head, cylindrical, one and one-fourth times as long as wide; sides almost straight 

 and parallel. 



Eyes somewhat triangular, 9 X 6 n, reddish brown, not pilose, about 250 facets. 



Ocelli present, concolorous with the eyes to which the posterior ones are closely 

 applied. 



Mouth-cone, rather bluntly rounding, reaching three-fourths of the way across the 

 pronotum. 



Antennae with eight segments, one and two-thirds times as long as the head; seg- 

 ments one and two black, concolorous with the head, segments three to six clear 

 yellow, eighth and tip of seventh yellowish-brown. 



Prothorax short, a little shorter than the width of the head, triangular, narrow in 

 front, well-developed spines on posterior angles and two on the anterior part of each 

 lateral margin. 



Mesothorax wider than the prothorax and very short, sides almost straight. 



Pterothorax a little narrower than the ab- 

 domen, sides almost straight. 



Legs long, concolorous with the body ex- 

 cept the brown tarsi. 



Wings: Fore-wings reaching almost to the 

 end of the abdomen, fringed with hairs 

 which are nearly as long as the width of 

 the abdomen, doubled for from 15 to 19 

 hairs, nerve weak and short, constriction 

 rather slight. 



Abdomen usually long and slender, 

 usually widest at the second or third seg- 

 ment and tapering gradually to the seventh 

 from which it rounds off more abruptly. 

 A pair of bluntly-tipped hairs along the 

 margin of each segment, becoming longer 

 and arising from nearer the posterior angle 

 on the posterior segments. The tube i3 

 0.14 mm. long and about 0.075 mm. wide at 

 the base. The end bears a circle of stiff 

 hairs, eight of which are about two-thirds as 

 long as the tube, six are shorter and weaker. 



Males are similar but smaller. 



EGG. 



The following description of the egg and those of the larval stages 

 are original. 



The eggs (PI. I, B; fig. 5) average about 0.37 by 0.15 mm. in size and are dull 

 black throughout the life of the egg. The entire surface is reticulated, being covered 

 with a network of waxy material arranged regularly and giving the shell the appear- 

 ance of being divided into hexagonal plates. 



FIRST-STAGE LARVA. 



When first hatched, the young larvae (PL I, C) are a light straw color and fusiform, 

 the legs and antennae being disproportionately large and giving the insects an ungainly 

 appearance. The average length is nearly 1 mm. and the width of mesothorax about 

 0.17 mm. The eyes are dark brown and the head, antennae, legs, and the last two 

 abdominal segments are light brown. The thorax contains two light-brown spots so 

 large as almost to cover it and make it appear brown with a yellow stripe through the 

 center. On the dorsal surface of each abdominal segment is a row of six brown dots 

 from which arise short colorless hairs. These dots are so arranged as to form six 

 longitudinal rows along the entire length of the abdomen. 



SECOND-STAGE LARVA. 



Average measurements of the second-stage larvae (PI. I, D) when full grown are: 

 Length 2.29 mm.; width of mesothorax 0.547 mm. General color orange red. The 

 "body is a light yellow to whitish color, but appears orange red owing to the pres- 

 ence of numerous very small, irregularly shaped blotches of orange-red pigment 

 underneath the epidermis. The antennae, legs, and last two abdominal segments are 

 light brown. The head also is light brown, with a narrow yellow streak through the 

 center. The eyes are dark brown. The thorax is yellowish, with two large brown 

 spots divided by a narrow yellow stripe through the center. A number of moderately 

 conspicuous hairs occur along the abdominal segments. 



Fig. 



5.— Eggs of tho camphor 

 enlarged. 



thrips. Greatly 



