40 ILLINOIS BIOLOGICAL MONOGRAPHS [272 



mesothoracic one is brown and the metathoracic one is white or cream- 

 colored. Each thoracic sternum is provided with a pair of verrucae ad- 

 jacent to the meson. The terga of abdominal segments one to eight are 

 provided with black or brown parascoli, except the fourth, in which the 

 parascoli are orange colored. The dorso-lateral parascoli of segments one 

 and four are also yellow or orange colored. The lateral aspect is provided 

 with a row of lateral parascoli, those on the first and fourth segments are 

 white and the remainder are brown. The lateral aspect is also provided 

 with a row of brown paralateral strumae ventrad of the lateral parascoli. 

 Sterna two to nine are provided with a transverse row of four verrucae 

 on each segment, sternum one bears only two ventral verrucae which are 

 adjacent on the ventro-meson, the ventro-lateral verrucae are absent. The 

 dorsum of the ninth abdominal segment is shield-shaped, twice as long as 

 its sternum, and provided with many setae or chalazae. The legs are well 

 developed and extend beyond the sides of the body. The tarsal claw is 

 without an appendiculate tooth. 



Hippodamia 13-punctata Linn. — The body is slender, elongate, widest 

 at the metathorax. The dorsal and lateral surfaces are provided with 

 parascoli. The general color is brownish-tan to dark grayish-brown and 

 the head is darker than the remainder of the body. The head is heavily 

 chitinized, the epicranial arms do not meet but extend separately to the 

 occipital foramen. The mouth is directed cephalo-ventrad. The pro- 

 thorax is wider than long, and when viewed from above, is oval in outline. 

 Its entire surface is covered with a solid brown dorsal shield which has a 

 fine white line running along the dorso-meson. The cephalic, lateral, and 

 caudal margins are provided with distinct chalazae. The mesothorax is 

 slightly longer than the metathorax, about twice as wide as long, with a 

 distinctly chitinized, oval, shield-shaped struma on either side of the 

 meson. This struma bears ten to fifteen chalazae. The metathorax is 

 more than twice as wide as long and provided with a chitinized shield-like 

 struma on each side of the meson. This struma bears about as many 

 chalazae as the mesothoracic strumae. The cephalic portion of the lateral 

 aspect of the mesothorax and metathorax bears the thoracic spiracles. 

 The mesothoracic spiracles are prominent and are located in the mesocoria 

 cephalo-dorsad of the coxacoriae, the metathoracic spiracles are rudimen- 

 tary. The caudal portion of the lateral aspect of the mesothorax is pro- 

 vided with a brown struma, while the metathorax is provided with a white 

 struma. Each thoracic sterna is provided with two distinct verrucae 

 adjacent to the ventro-meson. The legs are well developed and extend 

 beyond the sides of the body. The tarsal claw is without a distinct appen- 

 diculate tooth. The terga of abdominal segments one to eight are pro- 

 vided with distinct dorsal parascoli located near the dorso-meson, those 

 on the fourth abdominal segment are white. The lateral margins of terga 



