3 OS REPORT Ob' THE COMMISSIONER OF AGRICULTURE, 



kxeks, tibia:, and tarsi. 



Either partly or wholly piceous-red. | Piceo-testaceous, often clear yellow. 



Antenna} stout, joint 4 subquadrate and 

 widec than joiut 3; joint 5 as long as 

 the two preceding joints, and more than 

 twice as wide as the following joints, 

 elongate-quadrate, flattened ; joint 6 very 

 small, only one-half as long as joint 7. 



Last ventral segment with smooth im- 

 pressed median line, apical impression 

 moderately deep and traversed Ly the me- 

 diau line. 



«? 



Antennae more slender; joint 4 not wider 

 1 and hardly shorter than joint 3 ; joint 5 

 ' normally not wider, but one-third longer 

 than joiut 4, not flattened; joint 6 one- 

 ! half shorter than joint 7. 



Last ventral segment without median 

 I line; apical impression shallow and ili- 

 ; defined. 



Antenna? more slender than in £ , joint I 

 4 not wider than the rest, and as long as 

 joint 3; joint 5 a little longer than joint 

 4, not dilated; joiut 6 about one-third 

 shorter than joint 7. 



Last ventral segment simple. 



Antennae hardly more slender than in 

 <J; joint 5 very little longer and never 

 wider than joint 4 ; joint 6 as in the $ . 



Last ventral segment simple. 



DESCRIPTIVE OF ADOLESCENT STATES. 



Phyllotoeta zimmermanni. — Larva. — (Plate IV, Fig. 1, a, &).— In length, size, and 



shape very similar to P. vitiata. Color dark orange, ornamented with dark brown or 

 bluek ; head dark brown, nearly black ; prothoracic shield prominent and nearly black; 

 the other thoracic joints bear each side of dorsal line twosnbtriangular brown chitinous 

 patches, and sublaterally a triangular brown spot. Each abdominal joint bears dor- 

 sally three rows of small but very distinct chitinous patches, the middle one of the 

 posterior row largest. The ventral surface of each abdominal joiut is marked with 

 four similar chitinous patches. Tho whole surface of the integument, excepting, of 

 course, the chitinous portions, is seen with a low power to be covered with regular, 

 brownish granulations. The anal plate bears the same nnmber of hairs in nearly the 

 same relative position as in vittata. The mouth parts (Plate IV, Fig. 1, b) differ in 

 the mandibles bearing a rudimentary fifth tooth, and in the relative proportion of the 

 joints of the maxillary pal|>i, in which characters it comes nearer to nemorum than to 

 vittata. In other respects the resemblance to vitiata is marked. 



The larva of nemorum sceais to be intermediate bet ween those of vittata and zimmer- 

 manni, bearing the chitinous spots, but not so markedly as in zimmtrmanni. 



Pupa ( PI. IV, Fig. 1, c). — White, stout, of the same size and shape as the adult beetle. 

 The wings sheaths, when naturally folded, extend to the tip of the abdomen. The 

 antenna) are bent around ventraliy so as to reach near the hind coxa\ The whole 

 surface of the body is furnished with many stout bristles, and the anal segment ends 

 in two short, incurved, calliper-like setae. 



While there is no difficulty in distinguishing the two species under 

 consideration by the characters given above, upon examination of a 

 large number of specimens most of tho distinguishing characters are 

 found to be subject to variation. Even the secondary sexual characters 

 in the antennse are not constant; in zimmermanni the dilatation of the 

 fifth joint varies in extent, while in vittata the fifth joint not un frequently 

 is wider than the other joints, thus showing a tendency to become en- 

 larged, as in the former species. St ill. in vittata the dilatation of the fifth 

 joint is never so marked as in zimmermanni. and males of the two spe- 

 \ ies can always safely be distinguished by this character. The form of 

 the body is another character which is very constant, though very large 

 specimen* of vittata approach the more ovate form seen in zimmer- 

 vi -inn. The most constant character, however, is the form of the yel- 

 low elytral vitta, which is straight at base in zimmermanni, and always 

 incurved in vittata. Specimens of the latter species, in which the vitta 



