LEPTINOTARSA. 229 



eight specimens of the present and a number of the preceding insect for comparison, 

 and find no intermediate degrees between them. Yet this would not have induced me 

 to describe the present form as new, had not the thorax shown a different punctuation 

 in all the specimens from that of the allied species. In the latter the sides of the 

 thorax are always and distinctly deeply punctate, while the disk shows comparatively 

 few punctures ; but in L. puncticollis the entire thorax is covered with minute and 

 larger punctuation, scarcely, if at all, more strongly impressed at the sides, and the 

 elytral spots, although placed in the same position as in L. heydeni, are of less than half 

 the size. Lastly, the species is of larger size than the latter insect. 



6. Leptinotarsa zetterstedti. (Tab. xill. fig. 19.) 



Leptinotarsa zetterstedti, Stal, Diagn. 1859, p. 316; Monogr. Chrys. Amer. p. 154 \ 



Hab. Mexico 1 . 



I cannot agree with Chapuis in placing this species in Zygogramma. The claws, 

 although approached at the base, are not united ; the tibiae have a distinct groove up to 

 the middle ; and the general shape of the insect, as well as that of the thorax, agrees 

 perfectly with the other species of the genus, but in no way with Zygogramma. Stal 

 made a division of the present species, for the sake of aid in its determination 

 amongst the others. The species does not seem to be a common one : none were 

 obtained by Herr Hoge; and the collection of M. Salle contains but a single specimen; 

 another I have in my collection. 



7. Leptinotarsa modesta. (Tab. XIII. fig. 13.) 



Oblong-ovate, convex, greenish aeneous or bronze-coloured; bead finely punctured; thorax closely covered with 

 larger and smaller punctures ; elytra strongly punctured, the punctures arranged in irregular rows, the 

 interstices aciculate. 



Length 6|-7i lines. . . 



Head minutely and closely punctured at the base, more strongly at the sides; palpi and antenna black, the 

 latter extending to about one third the length of the elytra ; the first six joints shining, the rest opaque, 

 closely pubescent and distinctly widened, but longer than broad ; thorax transverse, of nearly equal 

 width, the anterior angles very acute and produced into a short point; the sides rounded and irregularly 

 sinuate ; surface extremely closely covered with larger and smaUer punctures, tbe former prevailing, 

 especially near the sides; scuteUum triangular, minutely punctured; elytra very convex, the sides 

 parallel, not widened posteriorly ; surface much more strongly punctured than the thorax, the punctures 

 placed in very irregular rows, the interstices aciculate or scratched ; inner margins of the elytral epipleurse 

 narrowly fulvous ; tibia} rugose-punctate, very obsoletely channelled at their outer surface; claws fulvous. 



Hab. Mexico, Guanajuato (Duges, coll. Salle). 



In size this species resembles L. heydeni and L. puncticollis. From these, as well as 

 all other species of this genus, the present insect is separated by its uniform greenish- 

 bronze colour. It cannot be considered a variety only of L. puncticollis, inasmuch as 

 the elytral punctuation is quite different, and leaves no broader longitudinal smooth 



