255] THE LARVAE OF THE COCCI NELLI DA E—GA GE 23 



with the caudal margin broadly rounded. Each lateral aspect bears a 

 small chalaza. In all of the genera of the Coccinellini the ninth segment 

 is more or less rectangular. The caudal margin is broadly rounded, usually 

 widest near the middle, distinctly narrower than the eighth segment, and 

 never crenulate or serrate. The lateral aspect is provided with numerous 

 setae. In Microweisea the ninth segment is conical, about twice as long 

 as wide, and much narrower than the eighth. The distal margins are 

 sharply rounded and the tergum is chitinized and brown. The lateral 

 aspect is provided with a few fine setae. In Scymnus the ninth segment 

 is conical, about one-half as wide as long, much narrower than the eighth 

 and not heavily chitinized. In Hyperaspis the ninth segment is semi- 

 circular, about twice as wide as long, and narrower than the eighth. The 

 caudal margin is broadly rounded and never crenulate or serrate. The 

 lateral aspect bears a few fine setae. 



The tenth abdominal segment is as a rule not visible from the dorsal 

 aspect. It appears to be a small ring of thin membrane surrounding the 

 rosetted anal area. In the Coccinellini this membrane is often pigmented 

 and appears black or brown colored. The rosetted appearance of the anal 

 area is caused by the evagination of the rectum. This serves as a sucking 

 disk and aids the larvae in locomotion. 



In all the coccinellid larvae there are eight pairs of abdominal spiracles 

 (Figs. 1 and 2, abdsp), a pair situated on each abdominal segment from one 

 to eight inclusive. They are located near the cephalic margin of each 

 tergum between the dorso-lateral and lateral senti in Chilocorus and Anatis, 

 between the dorso-lateral and lateral scoli in Epilachna, between the dorso- 

 lateral and lateral parascoli, strumae or verrucae in Hippodamia, Coc- 

 cinella, Megilla, Adalia, and Scymnus, and between the dorso-lateral and 

 lateral chalazae or setae in Hyperaspis. 



There is a pair of repugnatorial pores on segments one to eight (Figs. 

 1, 2, rp). These pores are located on each lateral margin of the tergum 

 in the coria between the segments. They emit a bad smelling fluid which 

 is of a repulsive nature and serves to protect the larva from its enemies. 



On each side of the dorso-meson in segments one to eight there are two 

 small pits. There is another pair on each side of the tergum near the mid- 

 dle about midway between the dorsal and dorso-lateral senti of segments 

 one to nine. All of these pits are arranged in a transverse row on the 

 tergum. There is another pit on the lateral aspect of segments one to 

 nine which is located immediately ventrad of the ventral senti. These 

 pits are probably the points of attachment for muscles. 



ARMATURE OF THE BODY-WALL 



The armature of coccinellid larvae consists of spine-like setae on the 

 body-wall or of conical, finger-like, or mound-like projections of the body- 



