524 



FAMILY XVI.— COCCINELLIDiE. 



Tribe VI. SCYMNINI. 



This tribe embraces a large number of small species readily 

 recognized by the distinct pubescence of the upper surface. The 

 genus Smilia, though composed of apparently glabrous forms, is 

 combined with the other genera on account of a similarity in struc- 

 ture. In all our forms the antennae are scarcely as long as the 

 head, thorax deeply emarginate in front and rounded behind; front 

 and middle legs more or less contractile, with the thighs sulcate be- 

 neath for the reception of the tibhe. Casey separates the tribe into 

 six genera, four of which are represented in Indiana. 



KEY TO INDIANA GENERA OF SCYMNINI. 



a. Thorax not deeply eniarginate ; . antennae apparently 11- jointed, free; 

 front coxa? moderately separated. 

 b. Thorax with a fine, obliquely impressed line behind the front angles ; 

 body apparently glabrous, yet finely pubescent under high power ; 

 tarsal claws simple. XV. Smilia. 



M. Thorax without an oblique line near the front angles; body always 

 distinctly pubescent ; tarsal claws bifid. 

 c. Clypeus prolonged for a Considerable distance before the eyes, the 

 sides converging; antennae inserted in small shallow emargina- 

 tions just before the eyes; prosteruum flat, not at all deflexed 

 toward the tip, generally bicarinate. XVI. Scymnus. 



cc. Clypeus extremely short before the eyes, truncate with rounded 

 angles, the antenna? inserted under its sides adjoining the eyes ;, 

 prosternum transversely convex, not carinate, broadly and grad- 

 ually deflexed, forming a protection to the mouth in repose. 



XVII. Stethoeus. 



aa. Thorax very short and broad and deeply emarginate in front ; antennae 

 apparently 9-jointed ; front coxte very widely separated. 



XVIII. Cephaloscymnus. 



XV. Smilia Weise. 1891. 



.Here belong very small rounded species formerly classed under 

 the genus PenUlia. Of the six listed from the United States, one is 

 known from Indiana. 



1003 (3090). Smilia misella Lee, Proc. Amer. Phil. Soc, XVII, 1878, 100. 



Oval, convex. Uniform black, shining. Thorax nearly smooth, the 

 impressed line near the front angles fine and indistinct. Elytra rather 

 coarsely, sparsely and somewhat unevenly punctate. Length .8-1 mm. ( Fig. 

 193.) 



Throughout the State; frequent. April 13-May 29. Occurs 

 especially on fruit trees infested with San Jose scale and one of the 

 most beneficial beetles preying upon that injurious insect. 



