398 COLEUPTERA OP NORTH AMERICA. 



3. Maxillary palpi with 4tli joint wider than 2d and 3d. 4. 

 Maxillary palpi with 4th joint not wider than 2d and 3d. 6. 



4. Pubescence prostrate. 5. 

 Pubescence erect; antennae slender; last joint of maxillary pal^ji secu- 

 riform. Ziiora. 



5. Antennse thick, outer joints transverse ; last joint of maxillary palpi 



Securiform. Carebara. 



Antennae slender ; last joint of maxillary palpi long, cultriform. 



Spilotus. 

 Antennae slender ; last joint of maxillary palpi triangular. 



Scotochroa 



6. Maxillary palpi serriform. 7 

 Maxillary palpi not serriform, 4th joint elongated. Xlnchodes 



7. Hind tarsi with 3d joint emarginate, shor,ter than 2d. 8 

 Hind tarsi with 3d joint not emarginate, equal to 3d ; maxillary palpi 



very compressed and serriform, last joint elongate, secniiforrn. 



Serropalpus. 



8. Last joint of maxillary palpi long, cultriform ; 



Prothorax elongate, side margin effaced in front, obsolete behind. 



Hypulus. 

 Prothorax quadrate, side margin effaced in front, distinct behind. 



Marolia. 



Group V. — Dircaeas. 



This group agrees with the Orcliesiae in having the front coxal 

 cavities entirely closed on the outer side, and witliout fissure, 

 but differs by the contiguous front coxae, which are not separated 

 by the prosternuni. Tiie head is vertical, and the jirosternum 

 short in Dircaea, but not in the otiier two genera; the penultimate 

 tarsal joint is more or less lobed beneath. 



Maxillary palpi with last joint securiform. 2. 



Maxillary jjalpi with last joint cultriform. Dircaea. 



2. Spurs of middle tibiae small, equal. Symphora. 



Spurs of middle tibiae very unequal. Anisoxya. 



No species is known to us from the Pacific region. 



Group Vl.^Orchesiae. 



Head vertically deflexed; antennte gradually thickened exter- 

 nally, 11-jointcd, third joint not conspicuously elongated; maxil- 

 lary palpi with the last joint more or less dilated; anterior coxae 

 oval, separated by the prosternum; middle coxa; separated; hind 

 coxae contiguous, flat, variable in form, oblique in Hallomenus, 

 not oblique in the other genera; spurs of middle and hind tibiae 



