329 C. STÅL, 
4. CHRYSOMELA ROGERSII LE CONTE. 
Rotundata, valde convexa, nigro-cyanea, thorace minus dense punctato, 
subtilius in medio, lateribus rotundatis, postice subparallelis, elytris auran- 
tiacis, seriatim punctatis, seriebus per paria approximatis, externis confusis, 
macula magna humerali, alterisque pluribus parvis nigris. Long. 32—47. 
Doryphora Rogersù Le Conte. Journ. Acad. Philad. New. Ser. 
IV. p. 26. (1858.) 
Patria: Platte River, Nebraska, Llano Estacado. 
Related to D. trimaculata, but apart from the markings ofthe elytra, it differs 
by the sides of the thorax being nearly parallel posteriorly, so that the base is not 
at all narrowed as in that species. The spots on the elytra are variable in size, 
and the two middle ones are sometimes confluent. They are placed: on each, two 
small ones near the base, and a large humeral one; then two at the middle near the 
suture, sometimes confluent; then three, the outer one near the margin, the inner 
ones usually confluent, and about one-third from the suture and one-third from the 
tip; finally a small dot near the lateral margin, about one-fifth from the tip; the su- 
ture is dark brown, nearly black. (sec. Le Conte l. c.) 
5. CHRYSOMELA DECEMLINEATA SAY. 
Yellow, thorax litterate with black; elytra each with five black lines. 
Doryphora 10-lineata Say. Journ. Acad. Philad. III. p. 453. 1. 
(1824.) 
* 5 Say. Compl writ. ed. Le Conte. II. p. 218. 
1. (1859.) 
» " Suffr. Ent. Zeit. XIX. p. 245. sub D. 10- 
lineata Rogers. (1858.) 
Inhabits Missouri and Arkansas. 
Body yellow: head with a triangular, black, frontal spot: thorax, two abbre- 
viated, black, approximate lines, divergent before; about six blaek dots on each side: 
elytra, suture, and five lines on each, blaek; the interior line is confluent with the 
suture behind; exterior line marginal; three intermediate ones joined or approximated 
at tip: beneath, ineieures and three or four series of ventral spots black. 
Length two fifths of an inch. 
var. a. Elytra white: the two outer intermediate lines are united at base and 
tip. (see. Say. 1. e.) 
Interstitium oetavum elytrorum profunde punctatum. (sec. Suffrian. I. e.) 
6. CHRYSOMELA CHLORIZANS SUFFR. 
Subovata, convexa, læte viridi-purpurascens, subtus æneo-nigra, anten- 
nis nigris, elytris parce punctulato-substriatis, transversim rugulosis. 
