COCCINELLIDAE. 113 



I'rotliorax hood-like, concealing: the head. 2. 



11.^. id more or less exposed. 5- 



2. Antennse straight ; hind angles of prothorax not prolonp;ed. '3. 

 Antennae strongly geniculate, 1st joint elongate ; hind angles of pro- 

 thorax more or less prolonged. 4. 



3. Antennse 11-jointed ; hody oval, not convex. Sacium. 

 Antennae 10-jointed ; body rounded, convex. Arthrolips. 



4. Glabrous ; hind angles of prothorax feebly prolonged ; antenna- 



10-jointed. Corylophus. 



Pubescent; hind angles of pnithorax niu.di prolonged; tarsi narrow. 



Sericoderus. 

 f). Prothorax feebly c^marginate in front, head slightly exposed ; tarsi 

 dilated. Rhypobius. 



Prothorax strongly cmarginate, head fully exposeil ; tarsi narrow. 



Orthoperus. 



Moronillns TJuVal, and Grloeosoma Wall., do not t?oem to differ 

 from Rhypobius Lee, which has priority. There is a discrep- 

 ancy in the descriptions of tiie antenna? of this genus. Du Yal 

 figures four small joints between the 2d and the ne.xt large one. 

 Wollaston but three, the inner one of which corresponds with two 

 of DuVal's; Dr. LeConte, with two ill-conditioned specimens at 

 his disposal, saw but two, and therefore considered the antenna; 

 as having only 9-joints. 



To Arthrolips belongs Cori/lophus viarginivollis Lee. 



Fam. XX.— COCCINELLIDAE. 



MentLim trapezoidal or triangular; ligula prouiinent oval, 

 ])alpi o-jointed, last joint oval, truncate at ti}). 



Maxilke with two ciliate lobes, the inner one smallor and 

 more slender, the outer one frequently obsoletely biarticu- 

 late; palpi 4-jointed, last joint usually large, and securi- 

 ibrm. 



Antenna? inserted at the inner front margin of the eyes, 

 base usually exposed, sometimes (Chilocori) covered by a 

 frontal expansion; 11-jointed in our genera, usually short 

 nnd retractile, long only in Myzia and Coccidula, with a 

 more or less distinct 8jointed club. 



l*rothorax transverse, of rather small size, side margin 

 acute, flanks frequently concave for the reception of the 

 antennal club; coxa! cavities closed behind, except in Cocci- 

 dula; coxas separated by the |)rosternum. 



Mesosternum short, epitiiera subtriangular. 



