Materials, Their Taxonomy and Natural History 6o 



Occurrence : In nature : Cabin John Bridge, Maryland, 1, not tested ; Yellow 

 Springs, Ohio, 1901, 1, tested, bred true; Chicago, Illinois, 1902, 1, tested, bred 

 true; San Antonio, Texas, 1904, not tested (Tower, 1906). 



Food: As in L. decemlineata. 



Juvenile stages: As in decemlineata, excepting that larvse in second and 

 third larval stages are always very small in size. 



Ecology: Elytral stripes edged with single regular rows of impressed puncta- 

 tions. Often depressed and placed at the bottom of a groove. 



JUNCTA DIVISION. 

 LEPTINOTARSA JUNCTA Gieb. 



(Plate 7, fig. 3.) 



Chrysomela juncta Guer., 1824. Ins. spec, nov., pp. 590, 825. Stai, 1862, 



Monog. Chrys. d. I'Am., pt. 1, p. 165; Kraatz, 1874, Berl. Zeit., p. 442, 1, 



fig. 6. 

 Doryphora juncta Rogers, 1857, Proc. Acad. Nat. Sci. Phila., VIII, p. 30, 1; 



Suffrian, 1858, Ent. Zeit., XIX, p. 243, 1. 

 Leptinotarsa juncta Guer. Gemminger et Harold, 1874, Catalog. Coleop., 



t. XI, pt. 1, p. 3440. 



This distinct and easily recognizable species is clearly separated from all of 

 the foregoing forms by the character of the elytral punctations first noted, I 

 believe, by Walsh (Am. Ent., vol. I). The original type I have not seen, but 

 Rogers's and Stal's determinations leave no doubt of the correctness of the 

 identification. Stal's description, taken from his monograph, is quoted merely 

 for completeness in taxonomy : 



" Ovalis, flavo-testacea, antennis apiceni versus nigro-f useis ; maculis capitis, 

 prothoracis ventrisque nee non scutello nigris; elytris stramineis, striato- 

 punctatis, interstitiis alternis nigris. Long. 9^11, Lat. 6-7^ millim. 



" Patria: America borealis, Georgia. (Mus. Holm., etc.) 



" Ovalis vel subovata, flavo-testacea, nitida. Caput apicem versus distincte 

 punctatum, maculis tribus vel quinque parvis, una basali, duabus mediis, duabus 

 prope apicem, nigris. Antenna? apiceni versus sensim nonnihil' incrassata?, 

 articulis apicalibus infuseatis, latitudine paullo longioribus. Prothorax elytris 

 nonnihil angustior. antrorsum sensim subangustatus, anterius utrimque leviter 

 rotundatus, obsolete parce punctulatus, utrimque punctis raris distinctis in- 

 structus, angulis anticis acutiusculis, vittulis duabus discoidalibus abbreviatis 

 nee non maculis pluribus parvis nigris ornatus. Scutellum l»ve. Elytra 

 lateribus parallelis vel retrorsum leviter ampliata, distincte striato-punctato, 

 seriebus punctorum basin baud attingentibus, quarta et quinta, septima et 

 octavo longe ab apice, sexta et nona prope apicem coeuntibus, interstitiis 

 secundo, quarto, sexto et octavo nee non dimidio interiore interstitii decimi 

 nigris, interstitio septimo reliquis angustiore, interdum fusco-testaceo vel nigri- 

 cante. Venter maculis, in series transversas dispositis, nigris ornatus. Femora 

 subtus interdum macula nigra ornata. 



" ^ Segmento ventrali ultimo apice truncato." 



Description of Living Animals. 



Imago: Stal's description of this distinct form leaves only comments as to 

 color necessary. In life the elytral ground-color is ivory-white and the head, 

 pronotum, and ventral side is light yellow-brown, making it one of the most 

 beautiful members of the genus. Much variation exists in the color-pattern. 



