44 ILLINOIS BIOLOGICAL MONOGRAPHS [276 



Scymnus sp.? — The body is fusiform, elongate, flattened, Kght-yellow 

 or cream-colored to light-brown. The head is circular in outline, very 

 slightly chitinized, and provided with numerous black setae which are 

 about one-half as long as the body is .wide. The epicranial suture is 

 entirely wanting and the mouth is directed cephalad. The prothorax is 

 slightly wider than long, and the dorsum bears the light-brown slightly 

 chitinized dorsal shield. The cephalic margin is provided with six large 

 black setae which are about one-third as long as the segment, the caudal 

 margin has six setae of about the same size as the cephalic setae, but not 

 so darkly colored; midway between the cephalic and caudal rows there is 

 another of four long black setae. The mesothorax is distinctly narrower 

 and shorter than the metathorax which is broadly emarginate on its 

 caudal margin. Both the mesothorax and metathorax have an oval- 

 shaped verruca on either side of the dorso-meson. This verruca is pro- 

 vided with setae which are about as long as the verruca is wide. The 

 thoracic sterna are distinct. Those of the mesothorax and metathorax are 

 provided with a few setae; while the prothoracic sternum is glabrous. 

 The coxacoriae are distant and the legs are well developed, usually white 

 or light-yellow in color, and extend beyond the margins of the body. 

 Each tibia is provided near the distal end with six to eight tenent hairs. The 

 tergum of the first abdominal segment is distinctly longer than the second. 

 Each tergum of abdominal segments one to eight is provided with a trans- 

 verse row of four distinct verrucae. The dorsal verrucae are adjacent to the 

 dorso-meson and the dorso-lateral are near the lateral margin of the tergum 

 in each segment. The lateral aspect of segments one to seven is lobed and 

 each lobe bears a distinct verruca with setae as long as the segment bearing 

 them. The lateral aspect of the eighth segment bears two or three chala- 

 zae about as long as the setae on the verrucae. There are on segments two 

 to eight one or two distinct paralateral chalazae immediately ventrad of 

 the lateral verrucae and chalazae, while the first segment bears a small 

 paralateral seta. The sterna of segments one to eight are similar to their 

 terga in size and shape. The cuticle is membraneous and bears on each 

 segment a transverse row of small setae. The coriae are distinct. The 

 ninth abdominal segment is longer than wide, slightly chitinized, and 

 marked with a dark spot near the middle and on either side of the dorso- 

 meson. The tergum is shield-shaped and provided with many dark colored 

 setae. The lateral aspect of the segment appears to be glabrous. The 

 sterna is shorter than the tergum, the cuticle is membraneous and armed 

 with a transverse row of four small setae. The tenth abdominal segment 

 is cylindrical, glabrous, directed caudo-ventrad and bears the large disk- 

 like sucker. 



