506 FAMILY XVI. — COCCINELLIDiE. 



KEY TO INDIANA SPECIES OF OETHOPEBUS. 



a. Elytra not punctate, but marked with spiall V-shaped scratches ; length 



.7 mm. scuTEiXABis. 



aa. Elytra distinctly but finely and sparsely punctate; length not over 



.6 mm. 



&. Form oblong-o\al ; length .6 mm. 970. glaber. 



66. Form evenly oval, the sides more curved ; length .5 mm. 



971. MICROS. 



0. scvtellaris Lee, black, legs and antemio? paler, is known from 

 Ohio and northem Illinois. 



970 (3029). Oethoperus glaber Lee, Proc. Phil. Acad. Nat. Sci., VI, 1852, 



142. 

 Oblong-oval. Piceous-black, glabrous, shining. Thorax twice as wide 

 as long, narrowed in front, emarginate at apex, hind angles rectangular. 

 Elytra very sparsely and obsoletely punctured. Ijength .6 mm. 



Southern two-thirds of State ; frequent. March 20-November 8. 

 Taken by sifting. 



971 ( ) . Oethoperus micros Casey, Journ. N. T. Ent. Soc, VIII, 1900, 66. 



Rounded-oval. Piceous-black, glabrous, shining. Keticulations of sur- 

 face distinct beneath the lens. Eyes separated on the front by but little 

 more than twice their own width. Length .5 mm. 



Throughout the Statp; scarce. May 19-.Tuly 4. 



Family XVI. COCCINELLIDiE. 



The Lady Bugs. The Plant-louse Beetles. 



This family comprises a moderate number of rounded or hemi- 

 spherical, rarely oblong, convex beetles, the larger members of 

 which are well known under the common name first mentioned. In 

 color they are generally rod or yellow, with black spots, or black 

 with white, red or yellow spots. The name Coeciiiclla is derived 

 from the Coccus, which produces the cochineal dyes so (Wtensively 

 used before the anilini^ dyes were discovered, and 

 was suggested by the pre\-alence of red in the 

 coloration ol: many of these insects. In most 

 eases the surface is glabrous, but in some of the 

 snjaller forms it is plainly pubescent. 



The most distinctive characters of the family 

 are the three-jointed tarsi and the broad, hatchet- 

 „. ,„„„.„,, shaped terminal joint of the maxillary palpi. 



Fig. 182. Comndla. 1, Art- . -, nr. \ t i t • J f r 



tenna; 2 mMiiiary palpus; 3, ( 1< ]g. 182.) In addition they have the antenna^ 



tarsus. (After Westwood.) . . 



ll-jomted, terminating in a more or less distinct 

 3-jointed club and inserted at the inner front margin of the eyes; 

 head deeply immersed in the thorax, which is transverse, rather 



