128 NEW YORK STATE MUSEUM 



of the prothorax, the central one largest, and another of five at 

 the posterior angle, three being much larger than the others. 

 The wing pads are seen for the first time and extend to the 

 anterior margin of the second abdominal segment. There are 

 two sublateral groups, each consisting of two compound spines, 

 one larger, one smaller and a simple one, near the posterior 

 margin of the mesothorax. The anterior lateral margin is armed 

 with a stout spine similar to that on the preceding segment, and 

 on the posterior angle there is a group of five compound spines 

 similar to those on the prothorax. 



The abdomen consists of 10 segments, numbers 2 and 3 having 

 a single lateral spine, while segments 4 to 8 are each ornamented 

 with lateral groups of three compound spines [pl.4, fig.10], one 

 being nearly twice the length of the other two. Segment 9 bears 

 only one on each side. There is also a slender, hairlike spine of 

 considerable length at the base of each group of spines on seg- 

 ments 2 to 8. Segments 2, 5, 6, 8 and 9 each bear a median pair 

 of long, stout, compound spines [pl.4, fig.lla], each of which, with 

 the exception of those on segments 2 and 9, has a simple spine 

 at its base [pl.4, fig.ll&]. The so called odoriferous glands appear 

 as in the younger stages on the dorsum of the third and fourth 

 segments. Certain extremely minute projections, with enlarged 

 extremities are scattered over the body, arising directly from its 

 surface. There are also more numerous chitinous points gener- 

 ally distributed and which give the body a brownish appearance. 



Stage 5. Length about 2 mm, width nearly 1 mm. The first 

 two segments of the antennae are about equal in length. The 

 third is longest and not quite twice the length of the fourth 

 [pl.4, fig.13]. The wing pads extend to the fifth segment of the 

 abdomen, which latter is nearly fusiform, tapering anteriorly 

 from the extremity of the wing cases. The dorsal spines are 

 relatively much larger and more specialized and the lateral 

 groups on the thorax and abdomen, excepting the last segment 

 of the latter, are distinctly pediceled [pl.4, fig.12]. This is also 

 true of the anterior median pair of the prothorax, which almost 

 coalesce, and of the median pair of the mesothorax. 



The original description of the adult is as follows : " Form 

 smilar to that of T. arcuata Say. Body black, the humeral 

 region and pleural margins sometimes paler, or piceous; the 

 venter polished, minutely, transversely wrinkled. Bucculae 

 highly elevated, white; antennae slender, the apical joint some- 

 times dusky. Pronotal vesicle* high, extending far forward, regu- 

 larly arching over the head, abruptly compressed anteriorly for 

 more than half its length; the meshes large, two larger ones 

 occupying the basal breadth; the nervures more or less em- 

 browned, that of the middle carinate, much elevated, entire. 



