THE LADY BEETLES. 511 



stems of the larger ragweed (Atnbroxia trifida L.} in the low bottom 

 lands of the Wabash River. 



III. HIPPODAMIA ]\Iuls. 1846. (A mythological name.) 



Thorax subtransverse, not margined at base; claws bifid; hind 

 tibial spurs distinct. Casey (Inc. cit.") lists 27 species of the genus 

 from the United States, while Leng. in a later paper (loc. cit.), re- 

 duced these to ten, the others being regarded as either geographical 

 races or synonyms. Of these four and one variety are known from 

 Indiana. 



KEY TO INDIANA SPECIES OF HIPPODAMIA. 



. Thorax black with broad pale lateral margins within each of which is 



a black dot; tibia- and tarsi pale. 974. 13-prNt'TATA. 



(/(/. Thorax with a narrower white lateral margin, without distinct dot, but 



usually intruded upon by a more or less pronounced angulation ol' 



the central black area; legs black throughout. 



b. Black disk of thorax nearly divided by a white quadrate spot at the 

 middle of base, and an elongate triangular spot at apex. 



975. PARENTHESIS. 



W). Black disk of thorax without white spot at base raid apex, but with 



two discal divergent white dashes. 



c. Front half of elytra without markings or with only a humeral 



black dot. 970. GLACIALIS. 



cc. Elytra each with six small spots, three of which are on the front 



half. 

 (I. Spots of elytra all small and widely separated. 



977. CONVERGENS. 



(Id. Spots much larger, the front one near suture apparently double. 



977a. VAR. 15-MACt'LATA. 



ar spot. T ^\ 

 e mark- 1 \ 



*974 (3050). HIPPODAMIA IS-ITNCTATA Liun., Syst. Nat, X, 17G5, 336. 



Oblong-oval. Head black at base; thorax described in 

 key and without discal divergent bars ; elytra each with six 

 rounded black spots and a small common scutellar spot. 

 Readily known by the pale tibire and tarsi and the 

 ings of the thorax. Length 4.5-5.2 mm. (Fig. 187.) 



Frequent throughout the northern half of State; (After Riiey.) 

 less so southward. February 23-December 25. In one specimen 

 from Laporte County the black area embraces nearly the entire 

 upper surface of thorax and the spots of elytra are nearly double 

 the usual size. 



*975 (3051). HIPPODAMIA PARENTHESIS Say, Journ. Phil. Acad. Nat Sci., 



IV, 1S24, 93; ibid. II, 232. 



Oblong-oval. Head black at base and apex; thorax described in key; 

 elytra reddish-yellow, with a large triangular common scutellar spot, a 

 round spot on hnmerus, and a strongly curved subapical luunle on each, 

 black. Length 4-5 mm. 

 [3323402] 



