526 



FAMILY XVI. — COCCINELLIDiE. 



the specimens should be so mounted that this can be readily done. 

 For convenience the Indiana species are first separated into two 

 groups. 



• ,'C 



fee 



b" A iy\ A j3 U a It' 



Fig. 194. a, metacoxal line;>, first ventral suture; c, hind coxal cavity. (After Horn.) 



KEY TO GROUPS OF SPECIES OF INDIANA SCYMNUS. 



a. Metacoxal line incomplete, gradually curving into the first ventral su- 

 ture and forming a part thereof, or not joining said suture. (Fig. 

 194. Nos. 1, 2 and 3.) Group A. 



aa. Metacoxal line forming an entire arc beginning at the inner border of 

 the coxal cavity and ending at or near the outer front angle of the 

 first segment. (Fig. 194. No. 4.) Group B. 



Group A. 



This group includes the Indiana species belonging to Groups 

 A, B and C of Horn's "Studies in Coecinellidae, " and in addition 

 a few that have since been described. 



KEY TO SPECIES OF GROUP A. 



a. Metacoxal line passing in an oblique curve from the hind coxal cavity 

 to the first ventral suture and joining the latter. (Fig. 194, No. 1.) 

 b. Elytra piceous, each with two pale spots. 



c. Head and thorax yellow, the latter sometimes with piceous basal 



SP0t. 1004. LIEBECKI. 



cg. Head and thorax black ; form oval ; elytral spots small and oval. 



MYRMIDON. 



66. Elytra piceous with a large yellow spot at apex, but without spots 

 on disk. 



cl. Thorax black with the apex narrowly, the front angles more broad- 

 ly yellow. 1005. terminatus. 

 (Id. Thorax yellow with a black basal spot. 1006. partitus. 

 aa. Metacoxal line not joining the first ventral suture. 



e. Metacoxal line extending outward, parallel with the suture and at a 

 slight distance therefrom. (Fig. 194. No. 2.) 

 f. Elytra wholly reddish-brown or dull brownish-yellow. 



1007. intrusus. 

 ff. Elytra black or piceous, marked with yellow spots. 



g. Each elytron with one rounded yellow spot behind the middle; 

 thorax black. 1008. flavifrons. 



gg. Each elytron with two oval spots. ornatus. 

 ee, Metacoxal line recurved at the outer end (Fig. 194, No. 3) ; elytra 

 black, narrowly tipped with red; thorax with black disk and red 

 margins. 1009. americanus. 



