1^^ [January 



The sculpture of the three thoracic segments consists of a very fine, 

 umbiUcated punctuation, which is chiefly apparent on the first segment 

 and more scattered on the others. There is besides, a longitudinal impres- 

 sed line, running along the middle of the back of the three segments, with 

 slight interruptions at the incisures ; this line is continued also, although 

 less distinctly, along all the abdominal segments. 



The feet : coxae elongated, subcylindrical, inserted near the lateral mar- 

 gin and directed obliquely towards the middle, so as almost to touch with 

 the tip, that of the opposite coxa; trochanters well developed, elongated; 

 femora subcylindrical; tibiae short, narrower than the femora, subcylin- 

 drical, bearing a curved, pointed nail at the tip. The feet of the last pair 

 are larger than those of the two other pairs. All three pairs have numer- 

 ous bristles on the underside; the femora have a crown of very short, 

 strong spines round the tip. The thoracic stigma is placed on the ventral 

 side of the mesothorax, in the anterior corners, close by the recurved mar- 

 gin of the upper disc. 



Tlit abdominal segments viewed from above, resemble in size and shape 

 the second and third thoracic ones ; they are perhaps a little longer, chiefly 

 the sixth, seventh and eighth and the middle ones a little stouter; the ninth 

 or last segment is shorter than the preceding, narrowed posteriorly. The 

 eight pairs of stigmata are placed laterally on the dorsal side of the first 

 eight segments, about the middle of a longitudinal furrow. Each ventral 

 segment consists of three portions ; the middle one is square, and but 

 slightly convex; it has a rounded, conchoid depression in the middle, with 

 fine longitudinal striae at the bottom (this depression is wanting only on 

 the last segment); the lateral portions, separated from the middle one by 

 longitudinal furrows, are elongated, smooth. These lateral pieces, together 

 with the corresponding pieces, cut off from the dorsal segments by the 

 stigma-bearing furrows, form an uninterrupted margin on both sides of 

 the larva. Except the dorsal impressed line and some hardly apparent 

 rugosities, the dorsal segments of the abdomen are smooth and even. 



The last segment ends in a short pseudopod, in the shape of a flattened 

 tube, directed downwards, truncated at tip ; its basal portion is black and 

 horny, with a small projection on each side ; the remainder is of a fleshy 

 substance. The anal opening seems to be at the tip of this tube. 



The larva from Arizona is easily distinguished from the former by its 

 coloring. The dorsal segments are dark brown or black anteriorly and 

 brownish-yellow posteriorly, the black occupying more than half the length 

 of the segment. The second anl third pairs of feet have tico ungues in- 

 stead of one, the second being smaller (in the other larva this second un- 



