1152 



FAMILY LITI. CHRYSOaIELIDJE. 



both base and apex, yellow. Thorax nearly twice as wide as long, finely 

 and sparsely punctate. Elytra with somewhat irregular rows of close-set 

 fine punctures. Length 4.5-5.5 mm. 



Lake County; scarce. May 5- June 24. Taken by sweeping 

 marsh vegetation. 



XXXIV. Labidomera Chev. 183-1. (Gr., "forceps + femur.") 



The old genus, horyphora 111., was discarded by Linell in his 

 paper, loc. cit., and the North American species were distributed 

 among this and the next genus, the two being separated only by the 

 characters given in the generic key. To Labidomera, as character- 

 ized, belongs only a single species and a western variety. 



*2135 (6785). Labidomera clivicollis Kirby, Faun. Bor. Arner., IV, 1837, 

 213. 



Oval, convex, robust. Dark blackish-blue; elytra 

 crange yellow with a large, black, cruciform common 

 spot in front of middle, each with a triangular spot 

 behind the humerus, and a V-shaped one near apex; 

 these spots sometimes in part or all confluent to form 

 one or two broad transverse bands. Thorax three times 

 as wide as long, sparsely and finely punctate. Elytral 

 punctures fine, arranged in irregular double rows. 

 Length 8-12 mm. (Fig. 496.) 



Throughout the State; frequent on the foli- 

 age of the common milkweed, Asclepias syriaca L. January 5- Au- 

 gust 3. Hibernates beneath logs partly buried in sand, mullein 

 leaves, etc. One of the largest and most handsome of our Chryso- 

 melids. 



Tig. 496. x lVo 

 (lifter Knobel ) 



XXXV. Leptinotarsa Stal. 1858. (Gr., "slender + tarsi.") 



Two of the 12 species recognized by Linell occur in Indiana, the 

 others being found in the Western and Southwestern States. One 

 of the two is the common injurious ' ' Colorado potato beetle ' ' and 

 the other is very similar in appearance. 



KEY TO INDIANA SPECIES OF LEPTINOTAESA. 



a. Elytra with double rows of confluent punctures, the suture and five 

 narrow "stripes on each black; epipleura pale. 2136. decemlineata. 

 aa. Elytra with single rows of regular punctures; each with five narrow 

 black stripes, the third and fourth usually united at base and apex. 



2137. juncta. 



