73 



tinguished, giving to the body a nearly uniform dull black color. 

 The shape is subcylindrical, well-rounded above and depressed ven- 

 trally. The body tapers about equally toward either extremity, the 

 diameter being greatest near the middle. The length is about four 

 times the width. The surface of the body, both above and below, is 

 very finely guttulate and very closely covered with large, dark tuber- 

 cles, or tuberculous spots of various shapes. Some are single and 

 some confluent, and bear, some one and some two hairs, the various 

 patterns which they form on the dorsum being indicated in the illus- 

 tration. All the tubercles appear black on the living larva, but in 

 alcohol they turn dull greenish brown. 



The head is rounded in outline, the lobes moderately constricted 

 posteriorly and are indicated b}^ a wide, shallow, median depression. 

 The color is moderately shining black, with white sutural lines show- 

 ing about the antennae and mouth-parts, the inverted 

 V mark is white and very thin. The hairs, which pro- J ^-^ \ 

 ject a few forward and a few diagonally from its sur- ^ ^ <~ 

 face, are dark brown. The antennae are black, and ^?x_~ 1/ 

 very short. The three pairs of thoracic legs are 

 mostly black, like the antennae on the exterior surface, 

 and mostly gray on the interior, being for the most 

 part gray toward the base and black apically. 



The thoracic plate is of the same ground color as the 

 other tubercular surfaces but spotted with dark brown, 

 and is surmounted with similar hairs. It has some- FlG - ^-— Halt tea 



ignita: ventral 



what the appearance of being made up of several view of 1st and 2d 

 smaller tubercular spots. The median tubercles of abdominal seg- 



L . ments, above; dor- 



the second and third thoracic segments are simple, sa i view of anai 

 but those of the abdominal segments are confluent segment, below— 



° both enlarged 



and form an elongate, oblong transverse band. The (original). 

 anterior confluent pairs are about a third wider than 

 the posterior. The tuberculiferous spots of the second and third tho- 

 racic are separated above by a narrow line moderately curved pos- 

 teriorly. 



The tubercular spots of the abdominal segments are arranged in 

 moderately regular rows of eight; those above the spiracles being 

 arranged in double and parallel rows ; those below in single rows. All 

 tubercles are prominent, the lateral being the largest and the dorsal 

 the smallest. The tubercles above the spiracles bear each a single hair, 

 blunt at the apex; the tubercles below the spiracles bear each two 

 acutely pointed hairs, placed closely together. 



In figure 18 the arrangement of the tubercles on the ventral sur- 

 face of the first and second abdominal segments is shown above, and a 

 dorsal view of the anal segment is given below. The anal proleg is 

 moderately prominent and nearly white on its exposed surface. 



