1196 FAMILY LIII. — CIIRYSOMBLID^. 



LVI. Phyllotreta Chev. 183i. (Gr., "leaf + bore.") 



Small elongate-oval or oblong-oval siibconvex species, separated 

 from allied genera by characters pertaining to the hind tibiaj as 

 mentioned in the generic key. They have the head small, deeply 

 inserted in the thorax; antenna; half as long as body, or slightly 

 longer ; thorax broader than long and somewhat narrowed in front ; 

 elytra oval, the humeri never prominent, usually marked with a 

 yellowish white sinuous stripe; first joint of hind tarsus about one- 

 third the length of tibiaj and equal to the other three; claws simple. 

 The males have the last ventral more or less impressed at tip. The 

 following species have been taken or should occur in the State. 

 All feed upon cruciferous plants, both cultivated and wild : 



Fig. 526. a, Antenna of Phylloireti ulkei, male; b, P. robv^la and antenna of male; c, P. sinuala and an 

 tenna of male; d, P. vittaUi and antenna of male; e, antenna of female of P. robusta, sinvMa and vittata; f, an- 

 tenna, male and female of pkta, hipuduJata, etc. (After Horn.) 



KEY TO INDIANA SPECIES OF PHYIiOXEETA. 



a. Fifth joint of antennae longer tlian either the fourth or sixth ; the male 



with the fifth joint always, and sometimes the fourth, thickened and 



elongate. 



6. Elytra piceous, without stripes ; sixth joint of male antennaj as long 



as the fourth and cylindrical. (Fig. r,2i\, a.) ulkei. 



66. Elytra piceous, each with a yello^^•ish stripe. 



c. Blytral stripe narrower; lower angle of fifth joint not' prolonged. 

 d. Stripes of elytra parallel with the suture on the basal half. 

 (Fig. 526, c.) 2212. sinuata. 



da. stripes of elytra incurved at base, approaching the scutellum 

 (Fig. 526. d.) 2213. vittata. 



cc. Elytral stripe broad, at its apical third reaching side, apex and 

 suture ; lower angle of fifth antennal joint distinctlv prolonged 

 <F'g-526, 6.) 2214. ROBUSTA. 



aa. Fifth joint of antennte nexer longer than sixth ; autennce not different 

 in the sexes, the joints gi-adually but slightly stouter from second to 

 tip. (Fig. 526, /.) 

 e. Elytra black and yellow. 

 /. Elytra each Nvith two oval yellow spots, one on humerus, the other 

 subapical. ooic ,„„., 



' -'J15. 13IPUSTUL.\.TA. 



//. Klylra dull yellow with ;i cmmon sutui-nl stripe and narrow mar- 

 ginal line, black. 2216. armor.u.i.-e. 



ee. Elytra nnjcolorous, 



