NO. 2171. SYNOPSIS OF THE COCCINELLID LARVAE— BOVING. 637 



These teeth are of different length and in some of the species the 

 larger ones are serrated. The inner margin of the mandible below 

 the teeth is convex and comparatively long, one-half to two-thirds of 

 the whole length of the mandible. 



Group IX (CHILOCORINI). 



Plate 120 and plate 121, figs. 33a, h; .34; 35a, 6. 



Of this group the following genera and species have been examined : 

 Curinus coeruleus Mulsant (Guatemala), Axion, sp. (Arizona), Exoch- 

 omus cuhensis Dimmock (Cuba) ; Egius platyceplialus Mulsant (Cuba), 

 Orcus australasiae Boisduval (Australia), Chilocorus hivulnerus Mul- 

 sant (N. Amer.), Chilocorus renipustulatus Scriba (Denmark), Chilo- 

 corus cacti Linnaeus (Mexico, Arizona). 



The group Chilocorini represents, as stated above, the final stage in 

 the evolution of the normal, carnivorous Coccinellid larva; they 

 belong to the subovate type, which includes the broader forais of the 

 Scymnini larvae, the Noviini and the Rhyzohiini, rather than to the 

 fusiform type, which mcludes the elongate forms of the Scymnini 

 larvae, the Coccinellini and the Psylloborini. The maximum width 

 is at metathorax, but this segment is only slightly wider than pro- 

 thorax and mesothorax and the first three abdominal segments; the 

 other abdominal segments narrow gradually to the ninth abdominal 

 segment; this segment is about twice as broad as long, anteriorly not 

 much narrower than the posterior edge of the eighth segment, broadly 

 rounded posteriorly with an unserrated margin. The areas of the 

 whole body carry spines of varying length. The pleurum is developed 

 as in the foregoing groups; on mesothorax and metathorax with a 

 spiracle-bearing, subtriangular protopleurite and with the opposite 

 subtriangular region large. The protopleurite is separated from the 

 tergum by a distinct tergo-pleural suture, but is confluent with pre- 

 sternum. On mesothorax the protopleurite carries a large setiferous 

 spine; on metathorax it also bears a spine, but this differs consider- 

 ably in the different species; it is for example rudimentary in Chilo- 

 corus renipustulatus, half as long and thick as the correspondmg spine 

 of mesothorax in Chilocorus cacti and hivulnerus, and it is as long and 

 thick as the spine of mesothorax in Exochomus cuhensis. 



The alar area carries according to the genus one, two, or three spines.* 

 A well-developed setiferous spine is always present on the larger sub- 

 triangular area behind the protopleurites of mesothorax and meta- 

 thorax, while the arrangement of the other spines on thorax varies as 

 described below. On the abdominal segments, except in some genera 

 on several of the posterior abdominal segments, the scutal, the spirac- 

 ular areas and the pleural lobe are armed with a well developed spine; 

 no spines on the areas below the stemopleural sutures. The hypo- 



> In reality a single spine with one or two large branches coming out from the base of the spine. 



