34 • ILLINOIS BIOLOGICAL MONOGRAPHS [266 



Coccinellini 



The body is fusiform or elongate, widest at the metathorax, usually 

 highly colored with black, red, yellow, orange, or blue; never with senti 

 except in Anatis in which the senti are short and thick, but never five 

 times as long as wide, usually with parascoli or strumae. The abdomen 

 becomes gradually narrower toward the caudal end. The ninth abdominal 

 segment is about twice as long as wide, never wider than long as in Chiloc- 

 orini or Hyperaspini, never with lateral parascoli or strumae as in Chiloc- 

 orini, dorsum provided with a light colored, slightly chitinized shield 

 bearing many setae or chalazae. The head is heavily chitinized, the 

 epicranial stem, if present, never extends one-third the distance from the 

 occipital foramen to a line drawn through the antacoriae; the epicranial 

 arms are usually widely divergent. The mouth is directed cephalo-ventrad. 



The members of this tribe are more numerous in Illinois than those 

 of any of the other tribes. They are almost wholly carnivorous, their 

 only plant food being either fungi or in some cases pollen grains. 



Genera of Coccinellini 



1(2) Epicranial stem and epicranial arms always present; terga one to 

 eight with strumae usually bearing three distinct chalazae and 

 densely covered with fine setae Megilla 



2(1) Epicranial arms always present; epicranial stem obliterated by the 

 separation of the epicranial arms 3 



3(4) Terga one to eight with senti, not five times as long as wide .Anatis 



4(3) Terga one to eight without senti 5 



5(8) Terga one to eight with parascoli or strumae which bear more than 

 five chalazae and are sparsely setaceous 6 



6(7) Tarsal claw with a distinct appendiculated tooth at its proximal 

 end Coccinella 



7(6) Tarsal claw without a distinct appendiculated tooth at its proxi- 

 mal end Hippodamia 



8(5) Terga one to eight with strumae which never bear more than five 

 prominent chalazae and the surface of the strumae densely seta- 

 ceous Adalia 



Megilla Mulsant 



This genus is represented in the material studied by a single species. 



Megilla maculata DeGeer. — The body is elongate, widest at the meso- 

 thorax and metathorax. Its general color is black and mottled with light 

 yellow or cream-colored areas. The head is heavily chitinized, the dorsal 

 portion dark and the ventral portion more or less white. The epicranial 

 stem is present as a short line or suture on the dorsal portion of the head. 

 It extends about one-fifth of the distance from the occipital foramen to a 



